Motor Main

8/17/2019 Motor Main

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1. Which standards govern the specifications for supply of Residual Marine Fuels and Distillate Marine Fuels onboard

merchant ships?

A. ISO 3012:1999B. ISO 3648:1996

C. ISO 8216-1:2010

D. ISO 8217:20102. Cran !eb deflection readings !ill give a positive indication of

A. worn main bearing jorna!"

B. #or"iona! "#re"" $e%orma#ion

C. "!a&' #(r"# bearing"

D. bearing "(e!!" "(im $imen"ion"". #$D stands for !hich type of boiler

A. )*#erna! "+er(ea#er D-#,+e

B. )mergen&, "(#$own Boi!er

C. )*#reme S+er(ea# #,+eD. )*#erna! S+er(ea# De-"+er(ea#er #,+e

%. &he advantage of tie rods over an engine !ithout tie rods is that'

A. (e engine i" er, ea"i!, a!igne$ a%#er an, mi"a!ignmen# (a" #a'en +!a&e be#ween $i%%eren# &om+onen#" o% #(e engine

B. (e engine $oe"n///# reire #(r"# +a$" %or #ran"mi""ion o% #(r"# #o #(e "(i+///" (!! a" #(e "ame i" being #a'en &are o% b, #(e #iero$"

C. (e engine &om+onen#" are m&( !ig(#er !ea$ing in oera!! re$ion i" engine weig(# wi#( a (ig( +ower genera#ion wi#( #(e

e!imina#ion o% %a#ige "#re""e"

D. (ere are no a$an#age" o% engine" wi#( #ie ro$" be&a"e #ie ro$" reire reg!ar main#enan&e an$ re+!a&emen# !i'e &onneing

ro$" an$ oera!! engine be&ome" more e*+en"ie #o o+era#e(. Which of the follo!ing is an e)ample of a solid bearing?

A. i"#on +in b"(ing

B. rbo-genera#or #rbine bearingC. S+ring bearing

D. (r"# bearing

*. +n order for microbiological gro!ths to thrive in a fuel tan it is necessary for

A. (ig( #em+era#re" #o e*i"#

B. !ow #em+era#re" #o e*i"#

C. "ma!! amon#" o% wa#er #o be +re"en#D. !arge amon#" o% wa#er #o be +re"en#

,. Marine boilers burning -.F.. face a problem of cold corrosion due to high sulphur content. &he minimum flue gastemperature !ithin any boiler part is ept above due point of -2$%. &he actual de! point of -2$% in flue gases depends on

the'

A. Boi!er %rna&e #em+era#re

B. Ambien# air #em+era#re

C. Boi!er o+era#ing +re""reD. O "!+(r &on#en# an$ moi"#re in &omb"#ion air

/. &he purpose of an air cooler in a supercharging system is to'

A. 5e$&e #em+era#re o% "+er&(arge$ air in or$er #o &on$en"e an$ remoe ma*imm +o""ib!e moi"#re %rom #(e air +rior en#r, #o#(e engine

B. 5e$&e #(e #em+era#re o% #(e "+er&(arge$ air in or$er #o in&rea"e #(e $en"i#, a!"o #o &oo! $own be!ow $ew +oin# #o remoe

moi"#re %rom air +rior en#r, #o #(e engine

C. Coo! "+er&(arge$ air #o in&rea"e i#" $en"i#, "&( #(a# #(e $ew +oin# i" no# rea&(e$ #o aoi$ en#r, o% moi"#re in#o #(e engineD. Coo! "+er&(arge$ air #o in&rea"e i#///" $en"i#, an$ a!"o #o 'ee+ #(e +ea' #em+era#re an$ e*(a"# ga" #em+era#re wi#(in !imi#"0. se of -alon as fire e)tinguishing medium has been discontinued because

A. I# i" (ig(!, #o*i&

B. I# i" e*+en"ieC. I# (a" (ig( Oone $e+!e#ing +o#en#ia!

D. I# !ea$" #o a&i$ rain"1. +n comparison to e)haust valves3 intae valves of diesel engines may be fabricated from lo!4alloy steels because

A. #(e bee!e$ e$ge" o% #(e in#a'e a!e" +roi$e %or"e!%-&en#ering $ring "ea#ingB. in#a'e a!e" #i!ie "#e!!i#e-&oa#e$ a!e "ea# in"er#"w(i&( re$&e wear

C. #(e o!me o% air +a""ing #(rog( in#a'e a!e" i" !e"" #(an #(e o!me o% air +a""ing #(rog( e*(a"# a!e"

D. in#a'e a!e" are !e"" a%%ee$ #o #(e &orro"ie aion o% e*(a"# ga"e"


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11. Why is it essential to rene! turbocharger bearings after a preset number of hours of running even if the bearings are in

seemingly perfect condition?

A. Be&a"e #(e, are +rone #o %ai!re $e #o +ro!onge$ e*+o"re #o (ig( #em+era#re &on$i#ion".B. Be&a"e #(e, are "bje #o &,&!i& !oa$ing an$ are +rone #o %ai!re $e #o me#a! %a#ige.

C. I# i" no# e""en#ia! #o renew i% &on$i#ion moni#oring "gge"#" +er%e &on$i#ion.

D. be oi! &on#amina#ion i" bon$ #o o&&r an$ a%%e #(e &on$i#ion o% #(e bearing".

12. Which of the follo!ing statements is true?

A. (e ro#ar, ane #,+e "#eering gear genera!!, o+era#e" a# (ig(er oi! +re""re" #(an #(e ram #,+e.

B. (e ram #,+e "#eering gear genera!!, o+era#e" a# (ig(er oi! +re""re" #(an #(e ro#ar, ane #,+e.

C. Bo#( ram #,+e an$ ro#ar, ane #,+e "#eering gear" genera!!, o+era#e a# "imi!ar oi! +re""re"D. one o% #(e aboe

1(. Modern marine turbochargers use a 55555555555 type of compressor

A. 5a$ia! %!owB. A*ia! %!ow

C. i*e$ %!ow

D. rb!en# %!ow1*. Which of the follo!ing is a disadvantage of !ater as cooling medium for pistons3 !hen compared to oil?

A. C(emi&a! #rea#men# i" reire$

B. ig(er #(erma! "#re""e" in +i"#on

C. i"#on o% more &om+!i&a#e$ $e"ign

D. A!! o% #(e aboe

1, -o! is the concentration of dissolved o)ygen in the feed !ater of an au)iliary boiler maintained at acceptable limits?A. ee$ wa#er i" &,&!e$ #(rog( a DC (ea#er.

B. ee$ wa#er i" #rea#e$ wi#( +(o"+(a#e".

C. O*,gen i" !ibera#e$ in #(e #(ree-"#age" o% %ee$ wa#er +re(ea#ing.D. O*,gen i" !ibera#e$ b, main#aining #(e (ig(e"# +rai&a! %ee$ wa#er #em+era#re

1/. +n a 24stroe marine diesel engine if the o4ring for 6acet cooling !ater sealing is leaing then

A. (e wa#er wi!! !ea' $ire!, in#o #(e &ran'&a"e

B. (e wa#er wi!! !ea' in#o #(e n$er +i"#on "+a&eC. (e wa#er wi!! &ome o# #(rog( #e!!-#a!e (o!e +roi$e$ be#ween #(e #wo o-ring"

D. (e wa#er wi!! &ome o# %rom #(e #o+ o% &,!in$er ja&'e#10. &he lube oil pump used in a diesel engine is a

A. o!#e +m+B. &en#ri%ga! +m+

C. $ia+(ragm +m+D. gear +m+

2. 7rior to lighting off a cold automatically fired au)iliary boiler3 you should

A. &(e&' an$ reg!a#e #(e wa#er !ee!

B. &!o"e #(e air &o&' on&e %ire" are !i#

C. b!ow $own #(e gage g!a""D. &ra&' #(e "#eam "#o+ #o a""re +ro#eie "#eam %!ow

21. $team temperature control for the #$D4++ boiler is achieved by '

A. i##ing a $e-"+er(ea#er be#ween 1"# 2n$ +a""e" o% "+er(ea#er

B. i##ing an a##em+era#or be#ween 1"# 2n$ +a""e" o% "+er(ea#er C. ;a" $am+er" in boi!er +#a'e

D. B,+a""ing #(e "+er(ea#er 22. &he coating !hich is provided on the valve stem of e)haust valves of modern marine diesel engines is of'

A. i&'e!B. S#e!!i#e

C. C(romim

D. imoni&2". +f the combustion control system of an automatically fired au)iliary boiler fails to sustain burner ignition after a normal

shutdo!n3 you should chec for a8an

A. %a!#, +(o#o&e!! $e#eor

B. !ow "#eam +re""re

C. (ig( o!#age on #(e igni#ion e!ero$eD. o+en air $am+er

2%. Which of the follo!ing statements is true3 about slo! speed engines?


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A. A "&aenge %ire &an !ea$ #o a &ran'&a"e e*+!o"ion

B. A "&aenge %ire &an !ea$ #o $e%orma#ion o% $ia+(ragm +!a#e

C. A "&aenge %ire &an !ea$ #o $amage #o #ie ro$".D. A!! o% #(e aboe.

2(. For a t!o stroe engine t!o o4rings are provided on the liner. &he function of the top o4ring is to 55555555555 and function

of the lo!er o4ring is to 555555555555

A. Sea! ja&'e# &oo!ing wa#er< a a" "e&on$ar, "ea! in &a"e 1"# o-ring !ea'"B. Sea! ja&'e# &oo!ing wa#er Sea! "&aenge air

C. Sea! "&aenge air Sea! =a&'e# &oo!ing wa#er

D. Sea! &omb"#ion ga"e" Sea! ja&'e# &oo!ing wa#er

2*. #ven if there is an oil mist concentration inside a crancase3 and there is also a hot spot3 crancase e)plosion !ill only tae

place !hen

A. (e (o# "+o# +roi$e" #(e igni#ion #em+era#re %or #(e oi! mi"# &on&en#ra#ion

B. >(en #(e oi! mi"# - air mi*#re i" in #(e %!ammab!e rangeC. Bo#( A an$ B

D. one o% #(e aboe2,. Which of the follo!ing conditions is responsible for the fuel oil to atomi9e !hen using a steam atomi9er in an au)iliary

boiler?

A. )*+an"ion o% #(e "#eam in #(e %rna&e.

B. )*+an"ion o% #(e "#eam in #(e w(ir!ing &(amber.

C. )*+an"ion o% #(e "#eam in #(e ori%i&e +!a#e.

D. A!! o% #(e aboe.

2/. $ome %4stroe engines are fitted !ith a rotorcap on the cylinder head valves. For !hat reason?A. 5o#a#e #(e in!e# a!e $ring o+era#ion.

B. Di"#rib#e #(e e*(a"# ga" or #(e air in!e# be##er #o im+roe &omb"#ion.

C. Im+roe #(e "&a!ing "r%a&e %nion in&rea"e #(e "eri&e #ime o% #(e e*(a"# a!e in #(e engineD. o +reen# #(e a!e "+in$!e %rom "#i&'ing

". $haft tunnel re:uires

a; drain

b; escape trun

c; !ater tight door

d; all the above

"1. What do you mean by surge limit of a turbocharger?

oining all the points of ma)imum pressure on compressor characteristic curves3 dra!n at various speeds ofoperation

D. Ma)imum rpm limit of &8C above !hich surging !ill start

"2. < large3 lo!4speed3 main propulsion diesel engine uses sea !ater to directly cool the

ectors

"". #)haust rouping is re:uired in case of 55555555555555 turbocharging in order to


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=. #arly start of in>ection and late end of in>ection

C. #arly start of in>ection and early end of in>ection

D. Aate start of in>ection and late end of in>ection

"/. Aabyrinth seal fitted on the bac surface of a compressor !heel of a turbocharger'

a#er B. A"(

C. Ca#a!,#i& %ine"

D. So$im%". +n modern marine 24stroe diesel engines3 5555555555555555 is sometimes used as a coating on the underside of the

e)haust valve disc3 to reduce the rate of hot corrosion.

A. one!B. C(romim

C. In&one!D. Cerme#

%%. +rregular circumferential !ear of liner due to diminishing neutrali9ing capacity of cylinder oil a!ay from lubricating holes

is no!n as'

A. i&ro "eire

B. S&%%ing

C. S&oring

D. C!oer !ea%ing%(. Which of the follo!ing is a reasonable statement about !ater !ashing of turbine side of a &8C ?

A. I# !ea$" #o #(erma! "(o&' an$ re$&e" #(e !i%e o% #(e ?C

B. I# !ea$" #o #(erma! "(o&' an$ no# "o e%%eie a" "o!i$ wa"(ing

C. I% +ro+er!, &arrie$ o# 'ee+ing r+m !oa$ #em+era#re !imi#" o#(er %aor" in#o a&&on#< i# i" i#e "a%e an$ moree%%eie #(an "o!i$ wa"(ing

D. I# "(o!$ neer be &arrie$ o# a" mo"# o% #(e engine man%arer" re&ommen$ again"# #(e "ame%*. Which of the follo!ing statements correctly describes the phenomenon of surging in a 24stroe crosshead type engine?

A. De #o "$$en in&rea"e in engine !oa$ #(e e*(a"# ga"e" ma, %!ow ba&' #(rog( "&aenge +or#" &a"ing "rgeB. De #o "$$en $e&rea"e in engine !oa$ #(e #rbo&(arger +re""re ra#io $ro+" . (i" &a"e" (ig( +re""re $own"#ream o%

?C in "&aenge #rn' &a"ing %!ow reer"a! o% "&aenge air

C. De #o "$$en in&rea"e in engine !oa$ #(e ?C #rbine r+m ma, in&rea"e "$$en!, in&rea"ing #(e &om+re""or +re""re

ra#io #o "rgeD. De #o "$$en $e&rea"e in engine !oa$ #(e #rbo&(arger ma, "#a!! a" #(e (ig(er +re""re $own"#ream in e*(a"# ","#em

ma, &a"e reer"a! o% %!ow o% e*(a"# ga"e"%,. +f the boiler tubes are scaled on the !ater side then

A. ea# &on$ion #(rog( #(e #be" wi!! be er, (ig( !ea$ing #o ra+i$ ea+ora#ion


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B. (e boi!er %rna&e &an ge# $amage$ $e #o e*&e""ie #em+era#re"

C. (e "r%a&e o% #(e #be wi!! be oer(ea#e$ a" (ea# #ran"%er i" im+aire$

D. (e na#ra! &ir&!a#ion o% wa#er wi#(in #(e boi!er wi!! be more e%%i&ien#%/. Fins are installed on the generating tube surfaces in !aste heat boilers to

@A reen# "oo# %ire" in #(e e*(a"# ","#em

@B reen# e*(a"# ga" ero"ion o% #(e #be"

@C In&rea"e #(e e!o&i#, o% e*(a"# ga" %!ow@D In&rea"e #(e ra#e o% (ea# #ran"%er

%0.


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C. .O. in!e# a!e &a"e" +re""re $ro+ ?) .O. +re""re "#an$b, wa#er i" no# +re""rie$ ma, &a"e "$$en &(ange in

engine ?+er !oa$?r+m

D. (ea#er !ea'ing.(0. Biscosity of fuel oil used for M# !as 1%(cst3 ne! fuel comes !hose viscosity !as more than earlier3 !hat u should do

a In&rea"e #em+ "e##ing

b C(ange "e##ing o% i"&o#(erm

& Do no#(ing$ O+en "#eam a!e mana!!, more

*. Which of the follo!ing can be done to reduce the cold corrosion of Main #ngine cylinder liners using high sulphur fuel oil

+f multi choice add First three options;

A. In&rea"ing &,!in$er oi! %ee$ ra#eB. E"ing (ig( B &,!in$er oi!

C. In&rea"ing "&aenge air #em+era#re

D. De&rea"ing &,!in$er oi! %ee$ ra#e*1. When m8e is running in emergency condition !hich of the alarms cant be bypassed

1. O !ow +re""re

2. =a&'e# wa#er (ig( #em+

3. i"#on &oo!ing wa#er (ig( #em+

4. A!! #(e aboe*2. Which of the follo!ing !ill be re:uired to be done in order to reduce sulphur corrosion of main #ngine Components?

A. In&rea"ing #(e a#omia#ion +re""re o% %e! injeor"

B. i##ing e*(a"# a!e" wi#( a!e ro#a#or"

C. 5nning engine a# or near norma! "ea !oa$

D. De&rea"ing #(e .O. +ri%ier %ee$ ra#e rnning #wo +ri%ier in "erie" one aing a" +ri%ier an$ o#(er a" &!ari%ier *". Where boiler point temp high?

A 5i"er

b S+er(ea#er & rimar, "#eam $rm

$ Se&on$ar, "#eam $rm*%. $udden stop of diesel engine multiple choices;

A. air in ","#emB. wa#er in ","#em

C. air %i!#er &(o&'e$

D. wa#er in air %i!#er *(. Mi)ed lubrication consist of

1. i* #wo !be" oi!

2. Con#imani#iFn o% (,$ro$,nami& !be oi!.3. i*e$ grea"e an$ oi!

**. &he muffling of e)haust gas noise in % stroe au)iliary engines in achieved by

@a A!!owing #(e ga" #o e*+an$.

@b C(ange #(e $ireion o% #(eir %!ow.

@& Coo! #(e ga" wi#( injee$ wa#er.@$ Coo! #(e ga" wi#( "&aenge air.

*,.


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B. ig(er #(an norma!

C. Same a" norma!

D. Same a" norma! i% #(e %ee$ i" 'e+# (ig(er ,2. Which of the follo!ing functions is done by a cam operating an e)haust valve?

A. I# goern" #(e #iming o% o+ening an$ &!o"ing o% #(e a!e.

B. I# goern" #(e "+ee$ a# w(i&( #(e a!e o+era#e"

C. I# goern" #(e amon# o% o+ening o% #(e a!eD. A!! o% #(e aboe

,". +n the latest concept of Bariable eometry &urbocharging3 5555555angle can be varied to match the turbocharger at

varying engine loads

A. Com+re""or aneB. rbine b!a$e

C. o!e ring b!a$e

D. Di%%"er ring b!a$e,%. &he primary function of a flame safeguard system3 as used on an automatically fired au)iliary boiler3 is to prevent

A. a&&i$en#a! $r, %iring an$ oer+re""re

B. n&on#ro!!e$ %ire" in #(e %rna&e

C. e*+!o"ion" in #(e boi!er %rna&e

D. e*+!o"ion" in #(e boi!er %rna&e,(. Directional intae ports in diesel engines are used to

A. re$&e air &(arge #rb!en&e

B. in$&e air "wir!

C. $e%!e (o# &omb"#ion ga" awa, %rom #(e a!e"

D. o++o"e #(e e%%e" o% +i"#on in$&e$ "i"(,*. Why does a chain stretch in service?

A. De #o +!a"#i& e!onga#ion

B. De #o (ig( #em+era#re e*+an"ionC. De #o wear on ro!!er" an$ b"(e"

D. De #o #(e +(enomenon o% &ree+,,. Which of the follo!ing methods is normally used to lubricate bearings in a small high4speed diesel engine?

A. S+!a"( !bri&a#ionB. re""re !bri&a#ion

C. Sig(# %ee$ !bri&a#or"

D. e&(ani&a! !bri&a#or",/. #)ternal fouling of boiler tubes can lead to'

A. ;rea#er "#eam genera#ion

B. be &orro"ionC. be )ro"ion

D. ro#eion o% #be again"# &orro"ion,0. What is the purpose of the inlet grid provided !ithin the e)haust gas casing in the gas flo! path3 prior entry to

turbocharger ?

A. o %i!#er o# an, nbrne$ &arbonB. o ab"orb an$ $am+en #(e +re""re %!a#ion

C. o re$&e noi"e in #(e &on"#an# +re""re e*(a"# +i+ing

D. o +reen# an, bro'en +i"#on ring" %in$ing #(eir wa, #o #rbine/. &he main function of tie rods in the construction of large3 lo! speed diesel engines is to

A. "#i%%en #(e be$+!a#e in wa, o% #(e main bearing" #o in&rea"e #(e engine" !ongi#$ina! "#reng#(

B. a&&e+# mo"# o% #(e #en"i!e !oa$ing #(a# re"!#" %rom #(e %iring %or&e" $ee!o+e$ $ring o+era#ion

C. mon# #(e engine %rame "e&re!, #o #(e (!! #o +reen# "(a%# &o+!ing mi"a!ignmen#

D. &onne #(e &ro""(ea$ "o!i$!, #o #(e +i"#on ro$

/1. &he fall in speed that occurs in a diesel engine e:uipped !ith governor3 on increase of load is called'

A. O%%"e#

B. S+ee$ $ro+C. S+ee$ $roo+

D. S+ee$ o%%"e#

/2. Which of the follo!ing factors governs the lo!er limit of thrust bearing clearance?

A. o a!!ow "ome oi! !ea'aGge #o +reen# oer(ea#ing

B. 5e$ion o% oi! i"&o"i#,

C. A!ignmen# o% &ran'"(a%#

D. o a!!ow #(e #(r"# +a$" #o #i!# an$ genera#e #(e oi! we$ge


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/". Which of the follo!ing can result in cracing of piston cro!n?

A. De+o"i#" in &oo!ing "+a&e"

B. Im+ingemen# o% %e! $e #o %a!#, injeionC. In"%%i&ien# +i"#on &oo!ing oi! %!ow

D. A!! o% #(e aboe/%. &he boiler !ater alalinity in a coil4type au)iliary boiler should be maintained at the p- recommended by the boiler

manufacturer to

A. +re&i+i#a#e "i!i&a %rom "o!#ion

B. re$&e &orro"ion in #(e (ea#ing &oi!

C. +reen# &!ogging an$ ero"ion in #(e &oi!

D. main#ain ero wa#er (ar$ne""/(. What does the @A+ number of a grease indicate?

A. (e o*i$a#ion re"i"#an&e o% #(e grea"e

B. (e &on"i"#en&, o% #(e grea"e i.e (ow %!i$ or non %!i$

C. Dem!"ibi!i#, o% #(e grea"eD. (e "(e!% !i%e o% #(e grea"e

/*. Which of the follo!ing layers of a thin shell bearing gives it its fatigue strength?

A. (e oer!a,

B. (e in#er!a,C. (e ba&'ing

D. (e barrier !a,er /,. Which of the bearings listed is most !idely used for main and connecting rod bearings of modern diesel engines?

A. S#ee!-!ine$

B. ore$ babbi## "e!%-a!igningC. S+!i# ro!!er

D. re&i"ion in"er#//. Which of the follo!ing statements is false?

A. (e %e! oi! "!%r !ee! i" one o% #(e im+or#an# &ri#eria %or &(oi&e o% B !ee! o% &,!in$er oi!.

B. (e "e o% an#i-+o!i"(ing ring" or %!ame ring" in&rea"e" #(e &on"m+#ion o% &,!in$er oi!

C. )*&e""ie &,!in$er oi! %ee$ &an !ea$ #o (arm%! $e+o"i#" in +i"#on #o+ !an$ area

D. one o% #(e aboe/0. When preparing to light off a cold boiler e:uipped !ith a return flo! fuel oil system3 the recirculating valve directs the

flo! of oil

A. $ire!, #o #(e %e! oi! (ea#er in!e# %or %r#(er warm-+

B. ba&' #o #(e %e! oi! "e##!er %or %r#(er %i!#ra#ionC. ba&' #o #(e "ion "i$e o% #(e "eri&e +m+

D. $ire!, #o #(e $ee+ #an'"0. 7rompt correction of speed of diesel engines driving alternators3 !ithout having massive fluctuations is ensured by

incorporating'

A. oa$ !imi#ing $ei&e"

B. oa$ "(aring $ei&e"

C. oa$ "en"ing $ei&e"D. oa$ "(e$$ing $ei&e"

01. +n a uniflo! scavenged marine 24stroe diesel engine3 the scavenge ports in a cylinder liner are machined

A. On!, %or a +ar# o% #(e &ir&m%eren&e a# an ang!e a!mo"# #angen#ia! #o #(e &ir&m%eren&e o% #(e !iner

B. A!! aron$ #(e &ir&m%eren&e a# rig(# ang!e" #o #(e &ir&m%eren&e o% #(e !iner C. on!, %or a +ar# o% #(e &ir&m%eren&e a# rig(# ang!e" #o #(e &ir&m%eren&e o% #(e !iner

D. A!! aron$ #(e &ir&m%eren&e a# an ang!e a!mo"# #angen#ia! #o #(e &ir&m%eren&e o% #(e !iner 02. +f the tappet clearance bet!een the rocer arm tappet and e)haust valve stem is e)cessive then'

A. (e a!e wi!! o+en ear!, an$ &!o"e !a#er B. (e a!e wi!! o+en !a#er an$ &!o"e ear!,

C. (e a!e wi!! o+en an$ &!o"e !a#er

D. (e a!e wi!! o+en an$ &!o"e ear!,0". +n order to reduce thermal loading on the upper part of the liner and increase the effectiveness of cylinder lubrication3

modern 24stroe marine diesel engines are designed to have'

A. Cerme# &oa#e$ +i"#on ring" bore &oo!e$ !iner" an$ ni%!ow "&aenging

B. ig( #o+ !an$ o% +i"#on &rown an$ $ee+er &,!in$er &oer wi#( #o+ !an$ o% &rown e*#en$ing in#o &,!in$er &oer a# DC

C. ow #o+ !an$ o% #(e +i"#on &rown wi#( bore &oo!e$ &,!in$er !iner D. Bore &oo!e$ &,!in$er !iner an$ bore &oo!e$ +i"#on &rown wi#( #oroi$a! "(a+e &omb"#ion &(amber

0%. Which of the follo!ing conditions can lead to reduced po!er developed by a main engine?

A. ig( "&aenge air #em+era#re

B. C(o'e$ air "ion %i!#er o% a #rbo&(arger


9/45

C. B!ow +a"# in one or more ni#"

D. A!! o% #(e aboe.0(. Which of the follo!ing types of diagrams !ould give an indication of effectiveness of e)haust and scavenge processes?

A. ower &ar$

B. Draw &ar$

C. ig(# "+ring $iagram

D. A!! o% #(e aboe.0*. &he arrangement used to protect overheating of the superheaters under fluctuating loads is called

A. De-"+er(ea#er

B. A##em+era#or

C. S#eam $m+ing a!eD. ee$ (ea#er

0,. 7iston rod stuffing bo) scraper rings butt clearances should'

A. o# #o be a!!owe$ #o %a!! be!ow H0 o% origina! &!earan&e

B. o# #o be a!!owe$ #o in&rea"e aboe H0 o% origina! &!earan&eC. o# #o be a!!owe$ #o %a!! be!ow man%arer re&ommen$e$ a!e

D. o# #o be a!!owe$ #o in&rea"e aboe man%arer re&ommen$e$ a!e0/. +n a 24stroe engine a 5555555555555555 separates the under piston space from the crancase.

A. A-%rameB. Cro""(ea$

C. Dia+(ragm

D. S&aenge "+a&e00. Fusible plugs are installed in fire4tube boilers to

A. +roi$e a mean" o% $raining #(e boi!erB. warn #(e engineer o% !ow wa#er !ee!

C. &oo! #(e &rown "(ee# a# (ig( %iring ra#e"

D. o+en #(e brner" e!eri&a! %iring &ir&i#"1. Which of the follo!ing gauges are generally used to evaluate main bearing clearances?

A. o'er gage

B. ee!er gage

C. e!e"&o+i& %ee!er gageD. Dia! gage

11. +n a coil4type au)iliary !ater4tube circulation boiler

A. nea+ora#e$ %ee$wa#er &o!!e" in #(e bo##om o% #(e %!a"( &(amber

B. a!! genera#e$ "#eam i" re&ir&!a#e$ #(rog( (ea#ing &oi!" in #(e boi!erC. (ea#e$ wa#er %!a"(e" #o "#eam in #(e boi!er (ea#ing &oi!"

D. re"+on"e #o "#eam $eman$ i" "!ower #(an in a %ire-#be boi!er 12. For a continuous operation diesel engine3 a duple) filter unit !ould be the best arrangement because

A. &(anging %i!#er e!emen#" wo!$ no# in#err+# engine o+era#ionB. %i!#ering o&&r" #wi&e in ea&( +a"" o% oi! #(rog( #(e ","#em

C. &!ogging wi!! no# o&&r

D. $ro++ing +re""re i" (a!% o% #(a# #(rog( a "ing!e %i!#er ni#1".


10/45

D. A!! o% #(e aboe are &orre.1,. &he function of the tie rods is to'

A. Jee+ #(e engine &om+onen#" n$er #en"ion a# a!! #(e #ime"B. ="# "e&re #(e engine +ar#" #oge#(er

C. A a" (o!$ing $own bo!#" %or #(e be$+!a#e an$ 'ee+" a!! #(e engine &om+onen#" #oge#(er

D. Jee+ engine &om+onen#" n$er (ig( &om+re""ion "o #(a# #en"i!e "#re""e" aing $ring %iring "#ro'e $o no# e*&ee$ #(i"

+re-&om+re""ion #o aoi$ %a#ige %ai!re1/. Which of the follo!ing types of cranshafts is much lighter at similar po!er re:uirements?

A. !!, bi!# #,+e

B. Semi bi!# a!! we!$e$ #,+e

C. Semi bi!# #,+eD. So!i$ %orge$ #,+e

10. or advantages of resin choing over cast iron choing3 in holding do!n

arrangements of modern diesel engines?

A. Be##er ibra#ion $am+ing +ro+er#ie".

B. Be##er &om+re""ie "#reng#(C. 100 &on#a no nee$ %or "r%a&e +re+ara#ion

D. one o% #(e aboe11%. +n a 24stroe crosshead type of engine3 the side thrust generated due to rolling and connecting rod and fore4aft thrust due

to pitching motion of the ship is taen care of by the'

A. i"#on an$ #(e !iner B. Conneing ro$ an$ #(e +i"#on ro$

C. Cro""(ea$ "(oe" an$ gi$e"

D. Cran'+in an$ #(r"# bearing11(. +n a B+& e:uipped >er type fuel pump'

A. 5ai"ing #(e barre! $e!a," beginning o% injeion

B. owering #(e barre! $e!a," beginning o% injeion

C. 5ai"ing #(e barre! $e!a," en$ o% injeion

D. owering #(e barre! $e!a," en$ o% injeion11*. &he over speeding of the diesel engine driving an electric generator could cause

A. !ow o!#age #ri+ #o #ri+

B. reer"e +ower #ri+ #o #ri+

C. $amage #o win$ing"D. e*&e""ie e*(a"# #em+era#re"

11,. +n a large3 slo!4speed3 main propulsion diesel engine3 !hich of the parts listed is under tension !hen the engine is

running?

A. Be$ +!a#eB. Co!mn

C. )n#ab!a#re

D. ie ro$11/. < diffuser is provided at the end of a mechanical atomi9er in boiler onboard


11/45

A. o +reen# b!ow ba&' o% #(e %!ame

B. o mi* #(e air an$ %e! +ro+er!,

C. o +reen# b!ow o# o% #(e %!ameD. o eje #(e e*&e"" %me" %rom #(e a#omier

110. $team stop valve is eased of its seat during boiler start up from cold

A. o a!!ow #(erma! e*+an"ion o% +ar#"

B. o a!!ow "#eam %!ow $ring "#ar# +C. o +reen# wa#er (ammer

D. A!! o% #(e aboe12. Which of the follo!ing statements about the design of D4 type boilers3 is false ?

A. (e (eaier wa#er in #o+ $rm %!ow" ba&' #o #(e bo##om $rm #(rog( #(e $own- &omer" o#"i$e #(e %rna&eB. In"i$e #(e %rna&e #(e wa#er i" (ea#e$ + in #(e ri"er"

C. (e ++er $rm i" #(e "#eam?wa#er $rm an$ #(e !ower one i" #(e wa#er $rm.

D. (e %ee$ wa#er i" +m+e$ in#o #(e !ower $rm121. 7resence of catalytic fines in fuel oil is significant to engineers on board because

A. Ca#a!,#i& %ine" #en$ #o im+air +ro+er o+era#ion o% +ri%ier"

B. Ca#a!,#i& %ine" !ea$ #o abra"ie wear in !iner" +i"#on ring" an$ %e! injeion ei+men#

C. Ca#a!,#i& %ine" ne&e""i#a#e in&rea"e in injeion #em+era#re

D. Ca#a!,#i& %ine" ne&e""i#a#e in&rea"e in "#orage #em+era#re122. With reference to the data logger for a refrigerate sys. Which of the parameters should be noted?

A. Sea wa#er #em+ +re""re

B. Con$en"er #em+

C. 5e%rigeran# !ea'age

D. )a+ora#or #em+.123. >(i&( o% #(e %o!!owing %aor" a%%e +ene#ra#ion o% %e! $ro+!e#" $ring injeion/

A. La!i#, o% a#omia#ion

B. Injeion #em+era#reC. S&aenge air +re""re

D. A!! o% #(e aboe.

124. be oi! +m+" #a'ing "ion %rom #(e "m+ o% mo"# "ma!! marine engine" are "a!!,

A. o% #(e $ia+(ragm #,+eB. o% #(e &en#ri%ga! #,+e

C. +o"i#ie $i"+!a&emen# #,+e

D. in$e+en$en#!, $rien b, e!eri& mo#or"

12H. e!e"&o+i& +i+e" #o #(e +i"#on o% a !arge "!ow-"+ee$ main +ro+!"ion $ie"e! engine are $e"igne$ #o +reen#A. e*&e""ie &ran'&a"e +re""re

B. e*&e""ie !be oi! #em+era#reC. &on#amina#ion o% #(e !be oi! b, wa#er

D. &on#amina#ion o% #(e &oo!ing wa#er b, !be oi!126. )*&e""ie a*ia! #(i&'ne"" o% a +i"#on ring &an !ea$ #o MMMMMMMMMMMMMMMMMMMM

A. S&ra+ing o%% o% oi! %rom !iner "r%a&e

B. In&rea"e$ wearC. wi"#ing in #(e grooe

D. Di%%i&!#, in %orma#ion o% oi! we$ge

127. >(i&( o% #(e %o!!owing i" an ///a$(e"ie/// #,+e wear o% a &,!in$er !iner/

A. C!oer- !ea%ingB. S&oring

C. S&%%ing

D. Oa!i#,

128. C,!in$er (ea$" o% marine $ie"e! engine" are +roi$e$ wi#( MMMMMMMMM #o re!iee an, e*&e""ie +re""re wi#(in #(e &omb"#ion&(amber

A. Sa%e#, a!e"

B. In$i&a#or &o&'"

C. 5e!ie% a!e"D. Br"#ing $i"&"

120. Woring of a pulse pressure turbocharger depends upon the 55555555555 that can be safely created in the e)haust

system.

A. )n#(a!+, $ro+B. re""re $i%%eren&e

C. rbo&(arger r+m

D. re""re +!"e"

130. (e ma*imm e!onga#ion o% #iming &(ain" in "eri&e i" !imi#e$ #o MMMMMMMMMMM o% origina! &(ain !eng#(.


12/45

A. 2

B. 1

C. HD. 3

131. D+!i&a#ion o% +ower ni#" %i##ing" an$ +i+ing" w(ere ea&( ni# i" &a+ab!e o% +roi$ing 100 "#eering +ower an$ a#oma#i&

i"o!a#ion o% one ni# in #(e een# o% a !ea'age@"ing!e %ai!re in #(a# ni# wo!$ &on"#i##e 100 re$n$an&, %or #(e "#eering gear

","#em. S&( ","#em i" man$a#or, on MMMMMMMMMMMM A. A!! #an'er"

B. an'er" aboe 10000 ;

C. an'er" aboe 100000 Dw#

D. A!! "(i+" aboe132. 5o#ine &!eaning o% air "i$e o% air &oo!er o% main engine i" $one b,:

A. Cir&!a#ing %re"( wa#er

B. Cir&!a#ing &o!$ &(emi&a! "o!#ion

C. Cir&!a#ing warm &(emi&a! "o!#ionD. Cir&!a#ing (o# wa#er

133. >(a# +reen#" ro#a#ion an$ %re##ing be#ween a #(in "(e!! bearing an$ i#" (o"ing/

A. o&a#ion #ang" or +eg"

B. (e ni+ or &r"( o% #(e bearingC. A "+e&ia! 'in$ o% a$(e"ie

D. An, o% #(e aboe

134. i&robia! $egra$a#ion o% main engine "m+ oi!" &an !ea$ #o:

A. In&rea"e$ &!ogging o% !be oi! %i!#er"

B. Corro"ie a##a&' on jorna!" an$ bearing"C. orma#ion o% "#ab!e em!"ion"

D. A!! o% #(e aboe.

13H. In &a"e o% &on"#an# +re""re #rbo&(arging #(e e*(a"# o% #(e &,!in$er" goe" in#o :A. Sma!! $iame#er e*(a"# +i+e" wi#( e*(a"# gro+ing

B. )*(a"# &om+en"a#or"

C. o!e"

D. arge $iame#er +i+e"136. >(i&( o% #(e %o!!owing i" a !imi#ing %aor in &,!in$er !iner &oo!ing/

A. a*imm &omb"#ion #em+era#re

B. inimm !iner #em+era#re

C. )*(a"# #em+era#reD. Dew +oin# %or %orma#ion o% "!%ri& a&i$

1",. Which of the follo!ing is not a conse:uence of over lubrication of a cylinder liner?A. De+o"i#" in +i"#on #o+ !an$ w(i&( &an no# on!, &on"me !be oi! b# a!wa," !ea$ #o in&rea"e$ abra"ie wear .

B. S#i&'ing an$ jamming o% +i"#on ring" $e #o in&rea"e$ $e+o"i#".C. Enbrn# !be oi! in "&aenge "+a&e" +o"ing in&rea"e$ ri"' o% "&aenge %ire .

D. In&rea"e$ &orro"ie wear 1"/. Bariable geometry turbocharging is the preferred choice over conventional turbochargers because '

A. ?C e%%i&ien&, i" er, (ig( a# (ig( engine !oa$"

B. ?C (a" goo$ "#ar#ing &(araeri"#i&" w(i!e e%%i&ien&, a# %!! !oa$" i" "!ig(#!, &om+romi"e$

C. ?C e%%i&ien&, i" o+#imie$ %or $i%%eren# engine !oa$" b, &(anging no!e ring geome#r,

D. ?C i" m&( &(ea+er an$ "im+!e #o man%are an$ i" ir#a!!, main#enan&e %ree1"0.


13/45

1%2. What is material of impeller of a &8C compressor ?

A. S#ain!e"" "#ee!

B. i!$ "#ee!C. A!minim "i!i&on

D. Brone

1%". ne of the ma>or disadvantages of constant pressure turbocharging over pulse pressure turbocharging is '

A. 5e$ion in "+e&i%i& %e! &on"m+#ion

B. eng#(ening o% e%%eie "#ro'e !ea$ing #o grea#er e*+an"ion in engine

C. oor #rbo&(arging e%%i&ien&,

D. Inabi!i#, o% #(e ","#em #o o+era#e a# !ow !oa$" an$ "!ow re"+on"e $ring a&&e!era#ion1%%. Friction3 engine !ear3 and oil consumption in a diesel engine are directly related to the

A. a&i$i#, o% #(e oi!

B. +or +oin# o% #(e oi!

C. %!a"( +oin# o% #(e oi!D. i"&o"i#, o% #(e oi!

1%(. +mproper maintenance of an automatic au)iliary boiler oil burner could result in

A. %e! +m+ %ai!re

B. %an mo#or %ai!reC. in&rea"e$ %ee$wa#er &on"m+#ion

D. $e&rea"e$ boi!er e%%i&ien&,1%*. &he effect of e)cessive tappet clearance is'

A. In&rea"e$ engine e%%i&ien&, a" e*+an"ion &an #a'e +!a&e %or a !onger $ra#ion an$ !e"" energ, wa"#e$ wi#( #(e e*(a"# ga"e"

B. a!e (ammering &(ange in #iming o% e*(a"# wi#( more "i$e #(r"# &a"ing grea#er wear be#ween "#em an$ b"(C. o"" in &om+re""ion +oor &omb"#ion im+ro+er mi*ing o% %e! air an$ ga" !ea'age $e #o im+ro+er &!o"ing o% a!e

D. rbo&(arger "rging !o"" o% ro#a#ion o% a!e "+in$!e an$ (ig( e*(a"# #em+era#re"1%,. &he difference bet!een rotocap and spinners for rotating e)haust valve spindle is that'

A. 5o#o&a+" ro#a#e #(e a!e" w(i!e &!o"ing w(i!e "+inner" ro#a#e #(em w(i!e o+ening

B. 5o#o&a+" ro#a#e #(e a!e" w(i!e o+ening w(i!e "+inner" ro#a#e #(em w(i!e &!o"ing

C. 5o#o&a+" ro#a#e #(e a!e" w(i!e o+ening w(i!e "+inner" ro#a#e #(e a!e %or #(e en#ire $ra#ion n#i! a!e i" "ea#e$

D. S+inner" ro#a#e #(e a!e" w(i!e o+ening w(i!e ro#o&a+" ro#a#e #(e a!e %or #(e en#ire $ra#ion n#i! a!e i" "ea#e$1%/. Most fuel in>ection no99les are opened by

A. %e! oi! +re""re

B. a &am o+era#e$ %o!!ower

C. a "+ring-!oa$e$ +re""re +!a#eD. #iming gear" 'e,e$ #o #(e &ran'"(a%#

1%0. Which of the follo!ing is a electro4 hydraulic type steering gear A. 5o#ar, ane #,+e

B. 5am #,+eC. Bo#( ro#ar, ane #,+e an$ ram #,+e

D. one o% #(e aboe1(. Which of the follo!ing purposes is solved by a piston rod gland or stuffing bo) ?

A. o +roi$e an air "ea! be#ween "&aenge "+a&e an$ &ran'&a"e

B. o +reen# ingre"" o% &omb"#ion +ro$" n"e$ &,!in$er !be oi! $ebri" e#& in#o #(e &ran'&a"e

C. o +reen# &arr, oer o% "m+ oi! in#o #(e &ran'&a"e

D. A!! o% #(e aboe1(1. Which of the follo!ing is a feature of $ul9er &ribo7ac pacage?

A. i$ !ee! !iner in"!a#ion

B. Dee+ (oning o% !iner

C. re- +ro%i!e$ an$ &oa#e$ +i"#on ring"D. A!! o% #(e aboe

1(2. +n !hich of the follo!ing steering modes3 rudder !ill be loced at a particular angle until ne)t manual order?

A. o!!ow +

B. A#o +i!o#C. on o!!ow +

D. one o% #(e aboe

1H3. ai!re o% #(e brner %!ame in an a#oma#i& a*i!iar, boi!er wo!$ +robab!, be a re"!# o%

A. wa#er in #(e %e! oi!B. bro'en (ig( #en"ion !ea$"

C. in&orre e!ero$e "e##ing

D. %!! %e! +re""re a# #(e no!e


14/45

1H4. A" +er reg!a#ion" #(e #ore &a+a&i#, o% a "#eering gear ","#em "(o!$ be "&( "o a" #o be ab!e #o #rn #(e

r$$erMMMMMMMMMMMMMMMMMMMMMMMMMM

A. 3H $egree" one "i$e #o 3H $egree" on #(e o#(er "i$e a# ma*imm "eri&e "+ee$B. 3H $egree" one "i$e #o 30 $egree" on #(e o#(er "i$e a# ma*imm "eri&e "+ee$

C. 3H $egree" one "i$e #o 3H $egree" on #(e o#(er "i$e a# norma! "eri&e "+ee$

D. 3H $egree" one "i$e #o 30 $egree" on #(e o#(er "i$e a# norma! "eri&e "+ee$

1HH. (e o#+# +re""re o% a $ie"e! engine !be oi! +m+ i" reg!a#e$ b, a?an A. re!ie% a!e

B. me#ering a!e

C. ariab!e "+ee$ +m+ $rie

D. ori%i&e in #(e !be oi! (ea$er 1(*. Most &8C have 44444444 flo! type of Compressor and 44444444flo! type of Rotor

a. Cen#ri%ga! 5a$ia! Im+e!!er a*ia!

b. Cen#ri%ga! a*ia! Im+e!!er ra$ia!

&. Cen#ri%ga! mi*e$ 5eaion 5a$ia!$. 5o#ar, a*ia! 5eaion 5a$ia!

1H7. aor" o% !ower !imi# o% #(r"# b, &!earan&e

a. A$j"#men# o% &ran'"(a%# b. o a!!ow #(r"# +a$" #o #i!# genera#e$ oi! we$ge

&. ro+er !bri&a#ion

1H8. "e o% ",n#(e#i& +o!,mer #rea#men# !imi#e$ #o !ow +r boi!er w(,/

a. $oe" no# (e!+ in +reen#ion o% "&a!e %orma#ion

b. $oe" no# (e!+ in &orro"ion +reen#ion&. $oe" no# %orm +(o"+(a#e #o #a&'!e &a"#i& embr#!!mn#

$. a!! o% aboe

$#C&+@ 2

FRM D $-+77+@ AD E#$&+@

1. While an au)iliary boiler is operating at design load3 !hich of the follo!ing actions !ill occur if the automatic combustion

control system detects a steam pressure drop?

@A ore brner" wi!! be !ig(#e$ o%%.

@B (e regi"#er" wi!! o+en %!!,.

@C (e %e! oi! a!e an$ air $am+er wi!! o+en wi$er.@D (e "#eam %!ow wi!! be a#oma#i&a!!, reg!a#e$.

2. < unit type fuel in>ector is used on a diesel engine to 5555555555555.

@A me#er #(e %e!@B +ro$&e #(e +ro+er %e! oi! +re""re

@C a#omie #(e %e!

@D a!! o% #(e aboe

". With the help of e)planatory setches briefly state the lubrication system for a large 2 stroe slo! speed marine diese

engine for the follo!ing.

@A &am"(a%# bearing"@B main bearing"

@C +i"#on &ro""(ea$ bearing"

@D &,!in$er wa!!"

%. +f the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer3 those

valves !ill 5555555555555.

@A o+en !a#e an$ &!o"e ear!,

@B o+en !a#e an$ &!o"e !a#e@C %ai! #o o+en w(en #(e engine i" &o!$

@D %ai! #o o+en a# norma! o+era#ing #em+era#re

(. Regarding a Diesel engine crancase3 the general arrangement and installation should preclude the possibility o

55555555.

@A %ree en#r, o% air #o #(e &ran'&a"e

@B wa#er en#ering #(e &ran'&a"e w(i!e engine wa"($own" are being +er%orme$

@C e*&e""ie oi! !ea'age $ring +erio$" o% in&rea"e$ b!owb,


15/45

@D "b&oo!ing in#erna! &om+onen#"

*. &he gro!th rate of microbiological organisms as found in some fuel supplies !ill 5555555555.

@A in&rea"e in $ire +ro+or#ion #o an in&rea"e in #em+era#re

@B $e&rea"e i% b!ea&(e" are a$$e$ #o #(e %e! on a reg!ar ba"i"

@C remain n&(ange$ +roi$e$ &om+!e#e &on"m+#ion o% #(e %e! o&&r" mon#(!,

@D A!! o% #(e aboe,. Fuel in>ection pumps using the port and heli) metering principle re:uires the use of a 55555555555.

@A &ro""(a#&(e$ $e"ign

@B !a++e$ +!nger an$ barre!

@C ariab!e "#ro'e@D ariab!e &am !i%#

/. +nternal combustion engine crancase vent outlets must be e:uipped !ith 555555.

@A (inge$ rain gar$"

@B &orro"ion re"i"#an# %!ame "&reen"@C $i+"#i&'" %or mea"ring oi! !ee!"

@D &ran'&a"e en#i!a#ion %an"0. 7roper lubrication of the main bearings is more easily obtained in a single acting four4stroe8cycle diesel engine than in

single acting t!o4stroe8cycle diesel engine because 555555555555.

@A bearing +re""re in a %or-"#ro'e?&,&!e "ing!e aing $ie"e! engine i" &on#ina!!, reer"e$

@B bearing +re""re in a #wo-"#ro'e?&,&!e "ing!e aing $ie"e! engine i" &on#ina!!, reer"e$

@C #(e ma*imm bearing +re""re i" (ig(er in a "ing!e aing #wo-"#ro'e?&,&!e $ie"e! engine

@D #wo-"#ro'e?&,&!e $ie"e! engine" reire more &om+!i&a#e$ !bri&a#ion +i+ing

1. +ncreasing the valve clearance bet!een a valve stem and rocer arm3 !ill result in the valve 5555555555555.@A &!o"ing !a#er

@B o+ening "ooner

@C "#a,ing o+en %or a "(or#er +erio$ o% #ime@D "#a,ing o+en %or a !onger +erio$ o% #ime

11. What preventative maintenance should be done fre:uently to diesel engine starting air receivers?

@A Drain #(e a&&m!a#e$ moi"#re.

@B e"# #(e re!ie% a!e".@C >a#&( #(e #em+era#re #o +reen# %!a#ion" in +re""re.

@D C!ean #(e in#erior #o remoe oi! an$ %oreign ma##er.12. Friction developing bet!een the moving parts of a governor3 governor linage and control valve !ill cause the governor to

555555555.

@A rea wi#( in"%%i&ien# "+ee$ $roo+

@B %ai! #o rea #o "ma!! "+ee$ &(ange"@C (ae e*&e""ie "en"i#ii#, #o "ma!! "+ee$ &(ange"

@D remain in #(e ne#ra! +o"i#ion1". &o minimi9e corrosion3 fuel oil strainer diss3 spacers and scraper blades are made of 5555555555555.

@A bra""

@B &o++er @C iron

@D mone! me#a! or "#ain!e"" "#ee!1%. +n a diesel engine3 ma)imum lube oil system pressure is normally controlled by 5555555555555.

@A #(e &a+a&i#, o% #(e !be oi! +m+@B #(e "+ee$ o% #(e !be oi! +m+

@C #(e o#!e# +re""re o% #(e !be oi! +m+

@D a re!ie% a!e1(. Which of the follo!ing statements describes the function of an e)pansion tan in a diesel engine cooling system?

@A ain#ain" a &on"#an# (ea$ on #(e ","#em.

@B 5e$&e" #(e !i'e!i(oo$ o% air or "#eam +o&'e#" %orma#ion.

@C roi$e" a !ow +re""re +oin# %or #(e a$$i#ion o% ma'e+ &oo!ing wa#er.

@D A!! o% #(e aboe.1*. Within the cycle of a forced circulation au)iliary !ater4tube boiler3 part of the !ater flashes into steam3 and the remaining

hot !ater is 55555555555555555.

@A &o!!ee$ in #(e !ower +or#ion o% #(e "#eam a&&m!a#or %or re&ir&!a#ion ba&' #o #(e (ea#ing &oi! or wa#er #an'

@B re#rne$ #o #(e !ower $rm ia $own&omer" $e #o $en"i#, $i%%eren&e %or re(ea#ing

@C +a""e" #(rog( #(e $ome"#i& (ea#ing ","#em re#rn !ine "#eam #ra+" #o #(e a*i!iar, %ee$ "++!, #an'

@D a#oma#i&a!!, $m+e$ in#o a*i!iar, %ee$ (ea#er an$ re(ea#e$ b, a*i!iar, e*(a"# ba&' +re""re1,. +gnition failure in an automatically controlled au)iliary boiler could be caused by 5555555555555.


16/45

@A &arbon $e+o"i#" on #(e %!ame "&anner

@B (ig( %e! oi! #em+era#re

@C !ow %e! oi! i"&o"i#,@D (ig( "#eam +re""re

1/. Which of the fuel in>ection systems listed uses a spring loaded differential spray needle valve and an individual pum

for each cylinder?

@A Common-rai! injeion@B Air injeion

@C =er' +m+ injeion

@D Di"#rib#or injeion10. &he interior of some diesel engine salt!ater heat e)changers are protected from corrosion by the use of 5555555555.

@A a!minm +!a#e"

@B !ea$ &a#(o$e"

@C &o++er ba%%!e +!a#e"

@D "a&ri%i&ia! in&"2. &he amount of chloride content in the !ater of an au)iliary boiler can be reduced by 555555555555.

@A a$$ing (,$raine

@B b!owing $own #(e boi!er

@C a$$ing +(eno!+(#(a!ein@D a$$ing a "!%i#e &(!ori$e "&aenger

21. Cooling !ater pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump !ith a

concentric housing to 555555555555.

@a +roi$e &oo!ing wa#er %!ow w(en #(e engine i" rnning ei#(er a(ea$ or a"#ern

@b +roi$e #(e grea#e"# +m+ e%%i&ien&,@& +reen# +m+ &!ogging %rom marine grow#(

@$ +reen# &ai#a#ion a# #(e +m+ o#!e#22. &he lube oil cooler is located after the lube oil filter in order for 5555555555555.

@A #(e %i!#er #o o+era#e more e%%i&ien#!,

@B #(e !be oi! &oo!er #o be b,+a""e$

@C +o"i#ie !be oi! +m+ "ion #o be a""re$

@D ga!ani& aion in #(e &oo!er #o be minimie$

2". < very sudden rise in pressure during combustion accompanied by nocing of the unit or detonation usually occurs

@a ear #(e en$ o% #(e +re""re ri"e a%#er igni#ion o% %e! &(arge.

@b ="# be%ore #(e %e! &(arge i" abo# #o igni#e.@& Imme$ia#e!, a%#er #(e ni# rea&(e" +ea' +re""re an$ be%ore igni#ion o% %e! &(arge.

@$ A# an, "#age o% #(e &omb"#ion +ro&e"".2%. &he main re:uirements !hich a fuel in>ection system must fulfill are and state each one of the points made above are true

or false

@a a&&ra#e me#ering o% "ma!! amon# o% %e! oi!.

@b &on#ro! o% a!i#, o% %e! injeion

@& +ro+er #iming o% #(e %e! injeion@$ "e!eie $i"#rib#ion o% #(e %e! in #(e &omb"#ion "+a&e.

. An" : A B C @5E) an$ D @AS)2(. +n any marine diesel engine3 air movements inside a combustion chamber is very important. enerally speaing3 air

movement helps3 $tate !hich of the above points are true or false

@a #o $i"#rib#e #(e %e!

@b #o mi* i# wi#( air

@& #o &oo! #(e &,!in$er !iner

@$ #o (e!+ in o+#imi"ing !iner !bri&a#ion@e #o a""i"# &omb"#ion

@% #o re$&e a%#er brning

@g #o re$&e &omb"#ion #em+era#re".

.An" : A!! #re

2*. $acrificial 9inc anodes are used on the salt!ater side of diesel engine heat e)changers to 5555555555555.

@A re$&e e!ero!,#i& aion on (ea# e*&(anger me#a!"@B 'ee+ (ea# #ran"%er "r%a&e" "(in, an$ &!ean

@C +reen# ra+i$ a&&m!a#ion o% marine grow#(

@D +roi$e a +ro#eie &oa#ing on (ea# e*&(anger "r%a&e"2,. &he fuel supply system to an automatic au)iliary boiler3 !ill be automatically shutdo!n if the boiler 55555555555555.


17/45

@A "a!ini#, i" abnorma!!, (ig(

@B "#eam $eman$ i" #oo (ig(

@C wa#er !ee! i" abnorma!!, !ow@D %ee$wa#er %!ow i" !ow

2/. &he crancases of many diesel engines are ept under a slight vacuum to 5555555555555.

@A im+roe %e! e&onom,

@B in&rea"e #(e air &(arge e!o&i#,@C re$&e #(e ri"' o% e*+!o"ion

@D a!! o% #(e aboe20. &he rate of cylinder lubricating oil metered to each cylinder of a large3 lo!4speed3 main propulsion diesel engin

is 55555555555555.

@A #(e "ame w(e#(er a# "ea or $ring maneering

@B a$j"#e$ $ring ea&( (or o% o+era#ion w(i!e a# &on"#an# 5

@C (ig(er a# "ea #(an w(i!e maneering

@D !ower a# "ea #(an w(i!e maneering". n a medium4speed main propulsion diesel engine3 the cranpin or cran >ournal bearings receive lubricating oil from

5555555555555.

@A a "+in$!e !bri&a#or

@B an oi! je#@C in#erna! "+!a"(ing

@D $ri!!e$ +a""age" in #(e &ran'"(a%#

"1.


18/45

D. )*+!o"ion re!ie% a!e""0. Which of the follo!ing actions should normally be taen during each !atch !hen the au)iliary boiler is in operation?

A. C!ean #(e %!ame "&anner +(o#o&e!! win$ow.B. In"+e an$ &!ean a!! "o!enoi$ a!e".

C. i%# #(e "a%e#, a!e" b, (an$.

D. In"+e %or oi! or wa#er !ea'".%. #)cessive vibration of an automatically fired au)iliary boiler can be caused by 5555555555555.

A. air or wa#er in #(e %rna&e

B. &omb"#ion +!"e"

C. %e! oi! +m+ %ai!re

D. %!ame %ai!re%1. < dirty atomi9er sprayer plate in the burner of an au)iliary boiler3 !ould be indicated by

a. &arbon on #(e regi"#er $oor"

b. a $a!ing w(i#e a#omier %!ame

&. %!a#ing +re""re in #(e win$bo*$. an neen!, "(a+e$ brner %!ame

%2. &he highest pressure in any closed diesel engine fresh!ater cooling system is at the 55

@a ja&'e# wa#er o#!e#

@b e*+an"ion #an' in!e#@& (ea# e*&(anger in!e#

@$ &oo!ing wa#er +m+ o#!e#%". Which of the follo!ing statements describes the function of an alarm annunciator on an engine room alarm panel?

@a An a!arm &on$i#ion &a"e" a !ig(# an$ "iren #o &ome on w(i&( remain on n#i! #(e ma&(iner, i" "e&re$.

@b A %!a"(ing !ig(# &ome" on %o!!owe$ b, an a$ib!e a!arm. >(en an a!arm a&'now!e$ge b##on i" $e+re""e$ #(e a$ib!ea!arm i" "i!en&e$ an$ !ig(# "#a," on.

@& An a!arm &on$i#ion gie" an a$ib!e an$ i"a! a!arm "igna! bo#( o% w(i&( are "e&re$ w(en #(e a!arm a&'now!e$ge

b##on i" $e+re""e$.@$ An a!arm &on$i#ion &a"e" a %!a"(ing !ig(# #o &ome on %o!!owe$ b, an a$ib!e a!arm. >(en #(e a!arm a&'now!e$ge

b##on i" $e+re""e$ #(e warning !ig(# i" e*#ingi"(e$.%%. #)cessive leaage and premature failure of valve pacing is a result of 555555555555.

@a o+ening a a!e #oo i&'!,@b jamming a a!e in #(e &!o"e$ +o"i#ion

@& !ow +re""re %!i$ %!ow #(rog( #(e +i+e!ine@$ a "&ore$ a!e "#em

%(. &he purpose of a temperature sensing device installed in the stac of a small automatically fired au)iliary steam boiler i

to secure the oil burner 555555555555555.A. in #(e een# o% a %!ame %ai!re

B. in #(e een# o% a "#a&' %ireC. w(en #(e wa#er !ee! rea&(e" #(e &rown "(ee#

D. w(en #(e %ee$ +m+ $i"&(arge +re""re $ro+" #o a +re"e# minimm%*. I% the combustion control system of an automatically fired au)iliary boiler fails to restart from the normal shutdo!n

mode3 you should chec for MMMMMMMMMMMMMM.@A bro'en or gron$e$ (ig( #en"ion !ea$"

@B a %a!#, igni#ion &ab!e &onneor

@C an in&orre e!ero$e "e##ing

@D a!! o% #(e aboe

%,. >hen taing tan soundings on a ship3 coating the tape !ith chal helps to 5555 MMMMMMMMMM.

@A be##er i$en#i%, #(e &orre rea$ing

@B "(ow #(e $e+#( o% an, wa#er in an oi! #an'

@C ma'e #(e #a+e ro!! ea"ier @D re$&e +o""ibi!i#, o% "+ar'"

%/. When a !aste heat boiler is installed in the e)haust of a main propulsion diesel engine3 the e)haust gas bypass !ould be

used 555555555555.

@a a# (ig( !oa$" #o +reen# oer(ea#ing@b a# !ow !oa$" #o +reen# &orro"ion in #(e boi!er

@& $ring +erio$" o% (ig( "#eam $eman$

@$ w(en #(e #rbo&(arger i" in o+era#ion


19/45

%0. +t is desirable for an au)iliary boiler safety valve to pop open and reseat :uicly to 5555555555.

@a gie warning #(a# e*&e""ie boi!er +re""re (a" been rea&(e$

@b +reen# wire $rawing o% #(e $i"& an$ "ea#@& +reen# a!e +on$ing

@$ +roi$e "%%i&ien# b!ow$own(. Which of the follo!ing statements is correct regarding grades of pipe?

@a S#ain!e"" "#ee! +i+e i" man%are$ in %or genera! gra$e".@b Bra"" +i+e i" man%are$ in #(ree &ommon gra$e".

@& Co++er +i+e i" man%are$ in #wo &ommon gra$e".

@$ (e #erm Ne*#ra "#rongN i" norma!!, a""o&ia#e$ wi#( "&(e$!e 160 "#ee! +i+e(1. &he crancase of many diesel engines are ept under a slight vacuum by the 55555555555555.

@A "&aenging aion o% #(e +i"#on

@B +i"#on #,+e a&m +m+ #a'ing "ion o%% a $i%%eren#ia! manome#er

@C g!an$ e*(a"#ing manome#er

@D &ran'&a"e e*(a"# %an(2. Aubricating oil systems for diesel engine >ournal bearings are usually lubricated by !hich of the follo!ing types o

lubricating oil systems?

@A S+!a"(

@B ;rai#,@C re""re

@D B,+a""(". Which of the follo!ing conditions can cause above normal air temperature to develop in the intae manifold of a four

stroe8cycle3 turbocharged3 diesel engine?

@A C!ogge$ air in#a'e %i!#er"@B i"#on b!ow-b,

@C A $e%eie a%#er&oo!er

@D a!#, e*(a"# a!e"(%. When may the crancase ventilation pipes or oil drain pipes of t!o or more engines be connected?

@A ro+!"ion engine" n$er 1000 "(a%# (or"e+ower ma, "(are a &ommon &ran'&a"e en# +roi$e$ #(e oi! $rain

remain "e+ara#e.

@B In mo"# &a"e" i# i" $e"irab!e an$ &o"# e%%eie %or +ro+!"ion engine" #o "(are a &ommon &ran'&a"e en#i!a#ion an$moni#oring ","#em.

@C o in#er&onneion ma, be ma$e be#ween #(e &ran'&a"e en#i!a#ion +i+e" or oi! $rain +i+e"

@D one o% #(e aboe are &orre.((. Which of the follo!ing statements describes the uncheced gro!th of microbiological organisms !ithin a fuel system?

@A (e $,ing baeria wi!! &a"e a &oa#ing #o be %orme$ on #(e "i$e" o% #(e #an' #(ereb, $e&rea"ing &orro"ion.

@B (e %e! in #(e #an' wi!! !oo"e i#" %!i$i#, "o!i$i%, an$ be #(e &a"e o% an e*+en"ie remoa! +ro&e""

@C Corro"ion o% ario" me#a! &om+onen#" wi!! o&&r $e #o #(e %orma#ion o% (,$rogen "!%i$e ga".

@D A!! o% #(e aboe are &orre.(*. +f the feed pump for an au)iliary boiler fails to deliver the feed !ater to the boiler3 the cause may be

@A (ig( "#eam +re""re in #(e boi!er

@B abnorma!!, (ig( %ee$wa#er #em+era#re

@C abnorma!!, (ig( boi!er wa#er #em+era#re

@D "#eam $eman$ e*&ee$ing %ee$ +m+ &a+a&i#,(,. When lighting off an au)iliary boiler3 !hich of the problems listed could cause the burners to sputter?

@A Co!$ %e! oi!

@B ow %e! oi! +re""re

@C ow a#omiing "#eam +re""re

@D >a#er in #(e %e! oi!(/. Which of the follo!ing actions taes place in the control circuit of an automatically fired au)iliary boiler !hen the desired

steam pressure is obtained?

@a A #em+era#re "en"ing $ei&e o+en" #(e &ir&i# brea'er in #(e brner mo#or.@b (e (ig( !imi# &on#ro! "e&re" +ower #o #(e en#ire oi! %iring ","#em.

@& (e "#a&' re!a, aa#e" #(e !ow !imi# &on#ro! w(i&( brea'" #(e igni#ion &ir&i#.

@$ (e "#a&' re!a, "e&re" +ower #o #(e (ig( o!#age "i$e o% #(e igni#ion #ran"%ormer.(0. e!e"&o+i& +i+e" #o #(e +i"#on o% a !arge "!ow-"+ee$ main +ro+!"ion $ie"e! engine are $e"igne$ #o +reen# MMMMMMMMMM.

@a e*&e""ie &ran'&a"e +re""re

@b e*&e""ie !be oi! #em+era#re

@& &on#amina#ion o% #(e !be oi! b, wa#er

@$ &on#amina#ion o% #(e &oo!ing wa#er b, !be oi!


20/45

*. Sb#raing #(e re#rn %!ow me#er rea$ing %rom #(e "++!, %!ow me#er rea$ing on a boi!er ei++e$ wi#( a re#rn %!ow %e! oi!

","#em $e#ermine" #(e amon# o% oi! MMMMMMMMMMMM.

@A &ir&!a#e$ b, #(e ","#em@B brner #(rog(+#

@C re#rne$ #o #(e "e##!er

@D $i"&(arge$ %rom #(e +m+

$#C&+@ "

6


21/45

11. While overhauling a piston rod stuffing bo)3 if the butt clearance of scraper rings is found belo! or near the

minimum3 the correct remedial measure !ould be MMMMMM

A. o %i!e #(e en$" o% #(e ring" an$ in&rea"e #(e &!earan&eB. o renew #(e ring "e# or %i# new !ame!!ae

C. o "wa+ #(e !ower ring" wi#( #(e ++er ring"

D. o renew a "egmen# or #wo o% ring "e# #o ob#ain #(e $e"ire$ &!earan&e

12. +n a electro4 hydraulic steering gear3 the movement of actuator is created by MMMMMMMMMMM A. S#ar#ing #(e mo#or" on bo#( +ower ni#"

B. O+era#ing #(e i"o!a#ing a!e"

C. S#ar#ing a# !ea"# one +ower ni# an$ aa#ing #(e $ireion a!e"

D. S#ar#ing bo#( +ower ni#" an$ aa#ing #(e $ireion a!e"

$#C&+@ %

1; Friction developing bet!een the moving parts of a governor3 governor linage and control valve !ill cause the governor to

a 5ea wi#( in"%%i&ien# "+ee$ $roo+

b ai! #o rea #o "ma!! "+ee$ &(ange"

& ae e*&e""ie "en"i#ii#, #o "ma!! "+ee$ &(ange"

$ 5emain in #(e ne#ra! +o"i#ion 2; < large change in ambient temperature3 or using an oil of a viscosity different than the one recommended by the

manufacturer in a mechanical hydraulic governor3 !ill result in the need to ad>ust the

a+i!o# a!e o+ening

b &om+en"a#ing nee$!e a!e

&&om+en"a#ing "+ring #en"ion$a&&m!a#or "+ring #en"ion

"; Friction3 engine !ear3 and oil consumption in a diesel engine are directly related to the

A a&i$i#, o% #(e oi!

b or +oin# o% #(e oi!

& !a"( +oin# o% #(e oi!

D i"&o"i#, o% #(e oi! %; When the prime movers of t!o paralleled generators3 e:uipped !ith mechanical4hydraulic governors3 are operating !ithin

their designed range3 the unit !ith the least amount of speed drop !ill G

a +i&' + more o% an, in&rea"e in !oa$

b+i&' + !e"" o% an, in&rea"e in !oa$&"(are an ea! amon# o% an, in&rea"e in !oa$

$$ro+ an ea! amon# o% an, $e&rea"e in !oa$ (; Clearance volume scavenging in a turbocharged3 four4stroe8cycle diesel engine is accomplished

a $ring #(e a!e oer!a+ +erio$ bwi#( on!, #(e e*(a"# a!e o+en

&a# a +re""re be!ow a#mo"+(eri&

$wi#(o# &oo!ing #(e &,!in$er" or +i"#on"*; &run4type diesel engine pistons are most effectively cooled by heat

a&on$e$ #(rog( #(e engine b!o&'

b&on$e$ #o wa#er &oo!e$ &,!in$er wa!!"

&&on$e$ #(rog( #(e +i"#on &rown$!o""e" #o e"&a+ing e*(a"# ga""e"

,; Fuel oil is in>ected into the cylinder of a four4stroe8cycle diesel engine during the

ain#a'e "#ro'e

be*(a"# "#ro'e&+ower "#ro'e

$&om+re""ion "#ro'e/; < large3 lo!4speed3 main propulsion diesel engine uses sea !ater to directly cool the

a&,!in$er (ea$" be*(a"# a!e"

&"&aenging air

$injeor"0; &he total starting air capacity re:uired for reversible main engines is to be sufficient for a least

a"i* &on"e&#ie "#ar#"

beig(# &on"e&#ie "#ar#"

&#en &on"e&#ie "#ar#"

$#we!e &on"e&#ie "#ar#"


22/45

1; &he light and medium fuels utili9ed in internal combustion engines provide a source of

a!bri&a#ion %or +i"#on" an$ ring"

b%oo$ %or mi&robio!ogi&a! organi"m"&ga"e" mo"# $e#rimen#a! #o #(e oone !a,er o% #(e a#mo"+(ere

$a!! o% #(e aboe11; Which bearing half !ill receive the greatest load in a t!o4stroe8cycle diesel engine?

aower (a!% o% #(e &onneing ro$ bearing a# #(e &ran'"(a%# en$ o% #(e ro$ bE++er (a!% o% #(e main bearing

&ower (a!% o% #(e +i"#on +in bearing in #(e &onneing ro$

$A!! bearing (a!e" "(are an ea! !oa$1"; < naturally aspirated diesel engine at full throttle !ill have an intae manifold pressure

a"!ig(#!, !e"" #(an a#mo"+(eri& +re""re

ba++ro*ima#e!, ea! #o e*(a"# mani%o!$ +re""re a# a!! #ime"

&#(a# i" wi$e!, %!a#ing

$&on"#an#!, $e&rea"ing a" engine !oa$ in&rea"e"1(;


23/45

a+ro!ong #(e igni#ion $e!a, +erio$

ben"re #(e beginning o% %e! injeion

&#(orog(!, #i!ie #(e air &(arge$a!!ow &on#ro!!e$ %e! &omb"#ion

"1; &he valve cam slope angle determines the G

aengine #ore &(araeri"#i&"

ba&&e!era#ion ra#e o% a!e o+ening an$ &!o"ing&engine %e! e%%i&ien&,

$$iame#er o% in#a'e an$ e*(a"# a!e""2; &he rate of fuel in>ection in a diesel engine cylinder depends primarily on

a#(e "ie o% #(e (o!e" in #(e %e! no!e b#iming o% #(e +m+

&"++!, +re""re #o #(e +m+

$"(a+e o% #(e &omb"#ion &(amber ""; Which of the follo!ing devices is normally provided to prevent oil starvation in a diesel lubrication system utili9ing the

Hfull flo!H principle?

aD+!e* "#rainer

b(ree-wa, a!e

&re""re re!ie% b,+a"" !ine aron$ #(e %i!#er$e&(ani&a! "#raining %i!#er

"%; < port4and4heli) fuel in>ection pump having upper and lo!er plunger heli)es is designed to

aar, %e! $e!ier, an$ re#rn +re""re

bar, #(e beginning an$ en$ing o% injeion

&o+era#e wi#( re"i$a! %e!" on!,$+roi$e ma*imm %e! $e!ier, ra#e

"(; ne advantage of hydraulic clutches over mechanical clutches in diesel engine installations is G

a#(e +ower i" #ran"mi##e$ a# er, (ig( e%%i&ien&, o% 60 b#(e #or"iona! ibra#ion" are #ran"mi##e$ $ire!, #o #(e re$ion gear"

&ea&( &!#&( (a" a "e+ara#e oi! g!an$ %or reer"e o+era#ion

$no me&(ani&a! &onneion e*i"#" be#ween #(e $riing an$ $rien e!emen#" "*; ection pump is designed for variable beginning and constant ending of in>ection. For diesel engines

operating at constant speeds3 the start of in>ection !ill

aa$an&e a" #(e !oa$ in&rea"e"

bre#ar$ a" #(e !oa$ in&rea"e"

&remain n&(ange$ regar$!e"" o% !oa$$a!wa," o&&r a# #o+ $ea$ &en#er

",; &he amount of fuel in>ected in a particular time3 or degree3 of cranshaft rotation is termedame#ering

b#iming&ra#e o% injeion

$ra#e o% $i"#rib#ion "/; +n a normally operating diesel engine3 the main source of lubricating oil contamination in the crancase is a result of the

G

a me#a! +ar#i&!e" !oo"ene$ b, wear

bair w(en no air &!eaner" are "e$

&&on$en"a#ion o% wa#er wa+or"$brea'$own o% #(e !bri&a#ing oi! b, $i!#ion

"0; n small diesel engines3 a noticeable decrease in the time interval bet!een the replacement of the lube filter cartridge

indicates G

a+i"#on ring b!ow-b, b$ir#, air %i!#er

&e*&e""ie oi! +re""re

$e*&e""ie oi! #em+era#re %; When the lo!er edge of the spiral begins to uncover the release port in a >er pump3 the

a+m+ing &on#ine" n#i! #(e +!nger #rae!" i#" %!! "#ro'e

be%%eie +m+ing "#ro'e o% #(e +!nger en$"

&+re". $ro+" "!ow!, n#i! #(e %!! "#ro'e i" a##aine$

$+!nger ro#a#e" #o #(e ero $e!ier, +o"i#ion n#i! ne*# "#ro'e%1; $ome diesel engines are fitted !ith a thermometer in the cooling !ater outlet from each cylinder. +f the cooling !ater

temperature from all cylinders begins to rise above normal3 you should suspect G

ain&rea"e$ b!ow-b, in a!! &,!in$er"

bin&om+!e#e &omb"#ion in a!! &,!in$er"


24/45

&oer!oa$ing in a!! &,!in$er"

$in"%%i&ien# %e! $e!ier, #o a!! &,!in$er"%2; 7roper operation of the main engine reduction gear set re:uires the operator to monitor

a#(e "m+ oi! !ee!

boi! %!ow "ig(# g!a""e"

&bearing #em+era#re"

$a!! o% #(e aboe %"; &he duration of fuel in>ection developed by an individual port4and4heli) fuel in>ection pump3 is determined by the G

a#o#a! +m+ "#ro'e

b+m+ +!nger $iame#er

&+!nger (e!i* ang!e$e%%eie +m+ "#ro'e

%%; =efore starting a diesel engine using an attached lube oil pump3 the engineer should

ao+en #(e b,+a"" !ine

b&# in #(e !be oi! &oo!er &+re""rie #(e !be oi! ","#em

$#o+ o%% #(e e*+an"ion #an' %(; < diesel engine using lube oil !ith too high a viscosity !ill e)hibit

ain&rea"e$ "#ar#ing $i%%i&!#, in &o!$ wea#(er bin&rea"e$ oi! &on"m+#ion

&#(i&'ening a# (ig(er o+era#ing #em+era#re"

$minima! %riion !o""e"%*; +f the main propulsion diesel engine governor !ors irregularly !ith a >ering motion3 a possible cause can be4

aa "#i&'ing %e! &on#ro! !in'age ba ma!%nioning oer!oa$ &am

&an n!o&'e$ oer"+ee$ #ri+

$%!oa#ing a!e" %,; During e)tremely cold !eather3 !hile starting an engine3 it turns too slo!ly and fails to start. &his problem is most lielythe result of

A ig( %e! oi! i"&o"i#,

b ow %e! oi! #em+era#re& ig( !be oi! i"&o"i#,

$ )nergie$ g!ow +!g"

%/; 7rolonged operation of a diesel engine !ith a closed cooling !ater system3 at lo!er than normal designed temperatures

can G

ain&rea"e +ower o#+#

b$e&rea"e !be oi! i"&o"i#,&e!imina#e %e! 'no&'

$&a"e "!%ri& a&i$ %orma#ion%0; Which of the listed governor characteristics !ill greatly affect the load sharing relationship bet!een paralleled diesel

generators?4

aSen"i#ii#, bower

&S+ee$ $roo+

$Com+en"a#ion (;


25/45

a#(e, are "i#ab!e %or "e on main +ro+!"ion ni#"

b#(e, "#rie #o main#ain a &on"#an# engine "+ee$ %or a!! a!e" o% "#ea$, !oa$

&#(e, &a"e a +ro+or#iona! $ro+ in engine "+ee$ a" #(e !oa$ i" in&rea"e$$#(e, (ae +oor "en"i#ii#, a# (ig( 5.

(%;. &heoretical perfect combustion in a diesel engine yields by4products of

aa!$e(,$e" an$ &arbon $io*i$e

bwa#er a+or an$ &arbon mono*i$e&ni#rogen an$ &arbon mono*i$e

$wa#er a+or an$ &arbon $io*i$e ((; Combustion noc can occur in the cylinders of a diesel engine under any condition permitting4

aa "(or#ene$ igni#ion $e!a, +erio$ ba !ean %e!?air mi*#re

&e*&e"" %e! in #(e &omb"#ion &(amber

$ra+i$ a+ori"a#ion o% injee$ %e! $ro+!e#" (*; When e)essive fuel dilution is noted in the lube oil3 the oil should be4

a&en#ri%ge$G

b%i!#ere$

&"#raine$

$&(ange$(,; $ticing of diesel engine piston compression rings may be caused by4

a(ig( &om+re""ion +re""re

be*&e""ie ring aion

&e*&e""ie &,!in$er !bri&a#ion

$im+ro+er ring ro#a#ion (/; When fuel is in>ected late into a diesel engine cylinder3

a#(e e*(a"# wi!! be &!ear

b%e! &on"m+#ion wi!! be !ow&a!! #(e %e! wi!! be brne$ a# #o+ $ea$ &en#er

$%e! &on"m+#ion wi!! be (ig((0; M# A inlet temperature should beI

a40C bH0C

&60C

$HHC*; #)haust temp of one M# cylinder high could mean

a%e! a!e" nee$ oer(a!

be*( a!e !ea'age&+i"#on ring b!ow +a"#

$a!! o% aboe*1;For a 2 stroe engine !ith e)haust portsI

a"&aenge +or#" &!o"e be%ore e*(a"# +or#"

be*(a"# +or#" &!o"e be%ore "&aenge +or#"&"&aenge +or#" an$ e*(a"# +or#" &!o"e a# "ame #ime be%ore BDC

$"&aenge +or#" an$ e*(a"# +or#" &!o"e a# "ame #ime a%#er BDC*2;For a 2 stroe engine !ith e)haust valvesI

a S&aenge a!e &!o"e" be%ore e*(a"# +or#" b )*(a"# a!e" &!o"e be%ore "&aenge a!e"

& S&aenge an$ e*(a"# a!e" &!o"e a# "ame #ime be%ore BDC

$ S&aenge an$ e*(a"# a!e" &!o"e a# "ame #ime a%#er BDC*"; &he ma)imum amount of liner !ear occurs atI

a#o+ o% !iner

b1? 3 $ownwar$ %rom #o+ &en#re

&mi$wa,

$bo##om o% !iner *%; Which of the follo!ing cannot be removed from fuel oil by centrifuging in the purifier and micro4filtration

a"o$im

ba!minim an$ "i!i&on

&ana$im$a"(

*(;+n the preheater before purifier the recommended heavy oil preheat is4

a8HC

b98C


26/45

&110C

$120&**;For a M# !hich has a ( micron fuel filter3 a homogeni9er omega fire ; is usually fitted G

abe%ore #(e +ri%ier

ba%#er #(e +ri%ier

&a%#er #(e H mi&ron %i!#er #o )

$be%ore #(e (orion#a! &!ari%ier *,;For a main engine fuel system !hich has a ( micron filter 3a super decanter is usually fittedI

abe%ore #(e +ri%ier

ba%#er #(e +ri%ier

&a%#er #(e H mi&ron %i!#er #o )$be%ore #(e (orion#a! &!ari%ier

*/;For lo! sulphur "/ cst fuels the &=@ of M#CC oil should be in the region ofI

a20

b40&60

$70*0;sing a M#CC oil of high &=@ can causeI

aim+ro+er &en#ri%ging o% wa#er bCa!&im !aer $e+o"i#" on bearing"

&"!$ge %orma#ion wi#( wa#er in ) "m+

$a!! o% aboe,;When using a high &=@ M#CA oil and suddenly the ship has to use lo! sulphur "/ cst - in the M#3 due to $#C< area

entryI are$&e #(e %ee$ o% )C

bin&rea"e #(e %ee$ o% )C

&$o no# &(ange #(e %ee$ ra#e$in&rea"e #(e B o% #(e )C

,1;M# scavenge air temperature is ad>usted by4

a&on#ro!!ing #(e "ea wa#er in!e#

b&on#ro!!ing #(e "ea wa#er o#!e#&'ee+ing o#!e# a!e 100 o+en a!wa,".

$none o% aboe,2;&he M# >acet FW cooling outlet temperature is4

a80C b9HC

&H0C$HHC

,";&he scavenge air high temperature set point for 2 stroe M# is

a40C

bHHC

&6HC$3HC

,%; ou see !hite smoe coming from the M# funnel stac3 this could be

aone or more &,!in$er" no# ge##ing enog( %e!

b#oo !ow &om+re""ion +re""re&wa#er in %e!

$a!! o% aboe,(;&he cran angles of a 2 stroe engine areI

a2 &,!in$er engine? 90 $egree" b4 &,!in$er engine? 60 $egree"

&6 &,!in$er engine? 90 $egree"

$4 &,!in$er engine? 90 $egree",*;Crancase e)plosions of main engines can be due to4

aoer (ea#ing o% )CC oi!

b+oor &on$i#ion o% !iner"? ring"

&&ran'"(a%# ? #(r"# bearing %ai!re

$ a!! o% aboe,,;+f there is air in the fuel oil filter3 the compression and ree)pansion of air !illI

ano# a!!ow #(e %e! injeion a!e #o &!o"e

bno# a!!ow #(e %e! injeion a!e #o o+en

&ma'e" no $i%%eren&e


27/45

$none o% #(e aboe ,/; Which of the bearings listed are most !idely used for the main and connected rod bearings of a diesel engine?

aro!!er b"!eee

&+re&i"ion in"er#

$nee$!e,0; Which of the follo!ing methods is normally used to lubricate bearings in a small high4speed diesel engine?

a"+!a"( !bri&a#ion

b+re""re !bri&a#ion

&"ig(# %ee$ !bri&a#or"

$me&(ani&a! !bri&a#or" /; +n a naturally aspirated diesel engine3 the volume of air intae is directly related to engine

a&om+re""ion ra#io

ba!e "ie

&%e! +re""re$&,!in$er &!earan&e o!me

/1; +n a bypass filtering system for a medium or high speed diesel engine3 the lube oil bypassing the filter

are#rn" $ire!, #o #(e "ion "i$e o% #(e +m+

bre#rn" $ire!, #o #(e "m+&%!ow" #o #(e engine bearing"

$%!ow" #(rog( a "e&on$-"#age "#rainer re(ea#er an$ re#rn" #o #(e "m+ /2; +n a diesel engine3 the main bearings are used bet!een the

a&onneing ro$ an$ #(e &ran'"(a%#

bwri"# +in an$ #(e &onneing ro$&&am"(a%# an$ #(e engine b!o&'

$&ran'"(a%# an$ #(e engine b!o&' /"; -eat e)changers are most commonly found in a small au)iliary diesel engine

a%e! oi! ","#em

bgoerning ","#em

&air "#ar#ing ","#em

$!be oi! ","#em /%; Multiple concentric valve springs are often used !ith diesel engine valves to

aenab!e re"ear&( an$ $ee!o+men# o% &am &on#or #o be "im+!i%ie$

bo+era#e #(e a!e gear w(ere #(e !arger %or&e i" reire$ b# "+a&e !imi#a#ion" re"#ri "e o% a !arge "+ring

&a!!ow %or ea"ier a!e re+!a&emen#$enab!e a #o#a! "ma!!er a!e "+ring %or&e #o 'ee+ #(e a!e #ig(# on i#" "ea#

/(; Which of the listed bearing installations is sub>ected to s!inging motion?a&ran'"(a%# jorna!

b&ran'+in bearing"&wri"# +in bearing"

$#(r"# bearing"/*; ne advantage of vacuum feed type cylinder lubricators over the li:uid sight type is4

a#(ere are %ewer moing +ar#"

ba$j"#men# i" no# reire$

&be##er me#ering a&&ra&,

$a !ower gra$e o% oi! ma, be "e$ /,; Cooling !ater pumps driven by direct reversing diesel engines are usually of the straight impeller vane type 4pump !ith

a concentric housing to

a+roi$e &oo!ing wa#er %!ow w(en #(e engine i" rnning ei#(er a(ea$ or a"#er

b+roi$e #(e grea#e"# +m+ e%%i&ien&,&+reen# +m+ &!ogging %rom marine grow#(

$+reen# &ai#a#ion a# #(e +m+ o#!e#//; Motor vessels usually have an independent lube oil system each for the main engine and main reduction gears because

a&oo!er" are no# nee$e$ %or #(e gear ","#em b&on#aminan#" +ro$&e$ b, #(e engine &o!$ (arm #(e re$ion gear"

&non a$$i#ie oi!" are "e$ in #(e main engine ","#em

$$i%%eren# #,+e &en#ri%ge" are reire$ %or #(e main engine an$ re$ion gear !be ","#em" /0; Which of the bearings listed is most !idely used for main and connecting rod bearings of modern diesel engines?

aS#ee!-!ine$

bore$ babbi## "e!%-a!igning

&S+!i# ro!!er

$re&i"ion in"er#


28/45

0; Directional intae ports in diesel engines are used to

are$&e air &(arge #rb!en&e

bin$&e air "wir!&$e%!e (o# &omb"#ion ga" awa, %rom #(e a!e"

$o++o"e #(e e%%e" o% +i"#on in$&e$ "i"( 01; Diesel engine main and connecting rod precision bearings are made in halves. #ach half e)ceeds one4half the bearing

circumference by a small amount. &he small amount is termed

a&!earan&e

b&r"(

&+i#&(

$#(r"#02; &he piston rod scraper bo) incorporated in a single acting t!o4stroe8cycle3 crosshead diesel engine serves to

ae!imina#e #(e ne&e""i#, %or an oi! "&ra+er ring

b+reen# "i$e #(r"# an$ &,!in$er "&oring

&+reen# "!$ge an$ $ir#, oi! %rom en#ering #(e &ran'&a"e$"&ra+e oi! an$ &arbon $e+o"i#" o%% #(e &,!in$er wa!!"

0"; &he proper location for >ournal bearing oil grooves is

ain #(e region o% #(e !oa$ bearing "r%a&e

ba" a "i$e re!ie% w(ere #(e #wo "(e!!" mee#&a# #(e bo##om o% #(e bearing

$(a!%wa, be#ween bo##om an$ w(ere "(e!!" mee# 0%; -o! are hydraulic valve lash ad>usters on diesel engine rocer arm assemblies lubricated?

aC+-%e$ grea"e

bSea!e$ "e!%-!bri&a#or"&e#ere$ (,$ra!i& oi! "++!,

$or&e$ !be oi! "++!, 0(; Main propulsion diesel engines having a bore e)ceeding " mm are to have at least

a#wo in$e+en$en# mean" o% "#ar#ing #(e engine

b%ie air "#ar#ing a!e" #o +ermi# #(e a$mi""ion o% "#ar#ing air a# an, &ran' ang!e

&one @e*+!o"ion re!ie% a!e a# #(e +o"i#ion o% ea&( main &ran' #(row

$#wo engine $rien !be oi! +m+" &a+ab!e o% +ara!!e! o+era#ion 0*; +ntegral !ater >acet liners use 4rings near the bottom of the liner3 these 4rings serve to

a%orm a wa#er "ea! be#ween #(e !iner an$ engine b!o&'

ba!!ow %or "!ig(# mi"a!ignmen# o% #(e !iner

&+reen# #(e e"&a+e o% !bri&a#ing oi! %rom #(e &ran'&a"e$en"re +ro+er #em+era#re %!ow be#ween #(e !iner an$ engine b!o&'

0,; &elescopic pipes to the piston of a large slo!4speed main propulsion diesel engine are designed to preventae*&e""ie &ran'&a"e +re""re

be*&e""ie !be oi! #em+era#re&&on#amina#ion o% #(e !be oi! b, wa#er

$&on#amina#ion o% #(e &oo!ing wa#er b, !be oi!0/; < characteristic of a bearing material !hich permits small dirt particles to become embedded in the surface Jis

a$e"irab!e a" i# wi!! +reen# $amage #o #(e jorna! "r%a&e

b$e"irab!e a" i# wi!! a""i"# in 'ee+ing #(e !be oi! %i!#er" &!ean

&n$e"irab!e "in&e #(e embe$$e$ +ar#i&!e" wi!! "&ore #(e jorna!

$n$e"irab!e "in&e #(e +ar#i&!e" wi!! in#er%ere wi#( !be oi! %!ow 00; Most fuel in>ection no99les are opened by

a%e! oi! +re""re

ba &am o+era#e$ %o!!ower

&a "+ring-!oa$e$ +re""re +!a#e$#iming gear" 'e,e$ #o #(e &ran'"(a%#

1; Which of the follo!ing devices controls the discharge flo! rate of an attached3 positive displacement3 rotary gear3 diesel

engine3 lube oil pump?

aA +re""re reg!a#ing a!e bA +re""re re!ie% a!e

&(e engine "+ee$

$An ori%i&e 11; &he e)pansion tan for a diesel engine closed cooling system is designed to maintain a constant head on the system and

are$&e wa#er #em+era#re

bre$&e wa#er #rb!en&e

&+roi$e an air &"(ion

$a!!ow %or an in&rea"e in wa#er o!me a" #(e engine warm" +


29/45

12; &o minimi9e corrosion3 fuel oil strainer diss3 spacers and scraper blades are made of

abra""

b&o++er&iron

$mone! me#a! or "#ain!e"" "#ee!

1"; Which of the follo!ing statements describes the function of an e)pansion tan in a diesel engine cooling system?

aain#ain" a &on"#an# (ea$ on #(e ","#em b5e$&e" #(e air &o&' w(en %ire" are !ig(#e$

&roi$e" a !ow +re""re +oin# %or #(e a$$i#ion o% ma'e+ &oo!ing wa#er

$A!! o% #(e aboe1%; n a large diesel engine installation3 cranshaft a)ial alignment is maintained by the

a+i"#on ro$ gi$e"

bengine #(r"# bearing

&&ro""(ea$ bearing

$main "(a%# %!e*ib!e &o+!ing1(; $cavenging in a four4stroe8cycle diesel engine occurs during the

a!a"# +ar# o% #(e e*(a"# "#ro'e an$ #(e %ir"# +ar# o% #(e in#a'e "#ro'e

b!a"# +ar# o% #(e in#a'e "#ro'e on!,

&ear!, +ar# o% #(e injeion "#ro'e on!,$ear!, +ar# o% #(e +ower "#ro'e

1*; +n a large3 slo!4speed3 main propulsion diesel engine3 !hich of the parts listed is under tension !hen the engine is

running?

aBe$ +!a#e

bCo!mn&)n#ab!a#re

$ie ro$ 1,; &he lube oil cooler is located after the lube oil filter in order for

a#(e %i!#er #o o+era#e more e%%i&ien#!,

b#(e !be oi! &oo!er #o be b,+a""e$

&+o"i#ie !be oi! +m+ "ion #o be a""re$

$ga!ani& aion in #(e &oo!er #o be minimie$1/; +n t!o4stroe8cycle diesel engine3 the process of scavenging begins as the

a+i"#on near" an$ +a""e" DC

bear!, +ar# o% #(e +"#ro'e

&+i"#on +a""e" BDC$ear!, +ar# o% #(e $own"#ro'e

10 W res. to flo! of lubricating oil through a diesel engine3 the lube oil coolers are located after filters in order toaa!!ow %i!#ra#ion o% !e"" i"&o" oi!

b$e&rea"e #(e +re""re $ro+ a&ro"" #(e %i!#er &im+roe oera!! %i!#ra#ion

$a!! o% #(e aboe 11; 7assages are drilled in the cranshafts of diesel engines to provide lubricating oil to the

amain bearing"

b&onneing ro$ bearing"

&+i"#on +in b"(ing"

$A!! o% #(e aboe 111; &he outlet from an e)pansion tan of a closed fresh!ater cooling system should be piped to the4

a&,!in$er (ea$ wa#er o#!e# (ea$er

b&,!in$er ja&'e# in!e# main

&(ea# e*&(anger in!e# &onneion$ja&'e# wa#er +m+ "ion !ine

112; &he intae valves in diesel engine are reseated by

a&am %o!!ower"

b+"( ro$"&&omb"#ion ga"e"

$a!e "+ring"

11"; $mall amounts of moisture are necessary to trigger the gro!th of microbiological organisms found in some marine fuels

$ome sources of !ater contamination are

a#an' "r%a&e !ea'age

b(mi$i#, an$ &on$en"a#ion

&im+ro+er #an' wa"(ing +ro&e$re"

$A!! o% #(e aboe


30/45

11%; &he main function of tie rods in the construction of large3 lo! speed diesel engines is to

a"#i%%en #(e be$+!a#e in wa, o% #(e main bearing" #o in&rea"e #(e engineG" !ongi#$ina! "#reng#(

ba&&e+# mo"# o% #(e #en"i!e !oa$ing #(a# re"!#" %rom #(e %iring %or&e" $ee!o+e$ $ring o+era#ion&mon# #(e engine %rame "e&re!, #o #(e (!! #o +reen# "(a%# &o+!ing mi"a!ignmen#

$&onne #(e &ro""(ea$ "o!i$!, #o #(e +i"#on ro$11(; n most modern diesel engines3the main and connecting rod bearings receive their lubricating oil by G

abanjo %ee$ b"+!a"( %ee$

&grai#, %ee$

$+re""re %ee$ 11*; < unit type fuel in>ector is used on a diesel engine to

ame#er #(e %e!

b+ro$&e #(e +ro+er %e! oi! +re""re

&a#omie #(e %e!

$a!! o% #(e aboe11,; Aubricating system for diesel engines are usually designed to initially provide lube oil to the engine4

a&am"(a%# bearing"

bmain bearing"

&+i"#on &rown"$&,!in$er wa!!"

11/; Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps !hich are4

ao+era#e$ mana!!, on&e ea&( (or

bo+era#e$ n#i! #(e engine (a" "#ar#e$

&+!a&e$ in#o o+era#ion on!, a# ma*imm !oa$$a$j"#ab!e #o mee# !bri&a#ion reiremen#"

110; $hacer3 circulation3 and spray are the three general methods used in

a+re-injeion %e! oi! #rea#men# b!be oi! %i!#ra#ion

&%e! oi! +ri%i&a#ion

$+i"#on &oo!ing 12; Fuel in>ector no99les are usually of the multi4orifice type !ith the number and placement of the holes arranged

according to the

a#,+e o% +i"#on ring"

b+re""re o% #(e %e! ","#em

&"ie o% #(e +m+ +!nger "+ring$$e"ign o% #(e &omb"#ion &(amber

121; What is the cran angle bet!een any t!o cran thro!s in the firing order of a four4stroe8cycle3 in line3 eight cylinderdiesel engine?

a4H b60 &90 $100122; &he main reason counter!eights are added to cranshafts is to

are$&e +i"#on "i$e #(r"#

bre$&e &ran'"(a%# en$ #(r"#&+roi$e ni%orm !oa$ing an$ wear o% main bearing"

$in&rea"e #(e "#reng#( o% #(e &ran' web"12"; < viscous damper3 as used on a marine diesel3 is a sealed precision built device !hich dampens the torsional vibrations in

the

a&am"(a%#

b%!,w(ee!

&&ran'"(a%#

$#(r"# "(a%# 12%; < cranshaft !hose center of gravity coincides !ith its center line is said to be

a$,nami&a!!, ba!an&e$

b"#a#i&a!!, ba!an&e$

&&on#er ba!an&e$$re"onan#!, ba!an&e$

12(; &he possibility of damage from operating a diesel engine at critical speeds is reduced by the use of

aan i"o&(rono" goernor

be!a"#i& engine mon#"&a ibra#ion $am+er

$a &a"# iron be$ +!a#e wi#( goo$ %!e*ib!e a!i#ie"12*;. +n a diesel engine lube oil system3 !hich of the follo!ing parts should be lubricated first?

aCam"(a%# bearing"


31/45

bain bearing"

&i"#on &rown"

$C,!in$er wa!!" 12,; When fuel oil heaters are re:uired for engine operation3

aea&( (ea#er "(a!! (ae #(e &a+a&i#, #o "++!, #(e main engine a# %!! +ower

ba# !ea"# #wo (ea#er" o% a++ro*ima#e!, ea! "ie are #o be in"#a!!e$

&#(e ","#em "(a!! be $e"igne$ #o +ermi# "erie" or +ara!!e! o+era#ion$none o% #(e aboe

12/;


32/45

b#o a +oin# no# !ower #(an #(e (ig(e"# !oa$ !ine

&a# a !o&a#ion "egrega#e$ %rom o#(er en#i!a#ion ","#em"

$an$ "(a!! be +ro#ee$ b, a rain gar$ or "imi!ar $ei&e 1"0; Which of the bearing types listed is most commonly used in smaller vessel main propulsion reduction gears as thrust

bearings?

aba!! bearing"

b+ore$ bearing"&"!eee$ bearing"

$#a+ere$ ro!!er bearing" 1%; &he main reason for using bimetallic piston rings is to

ain&rea"e engine #(erma! e%%i&ien&, bre$&e "+e&i%i& %e! &on"m+#ion

&re$&e #(e +robabi!i#, o% ring %rare

$a!!ow %or ring e*+an"ion

141 A "+ring-!oa$e$ &en#ri%ga! %!,weig(# goernor re"+on$" #o re$&e$ engine !oa$ wi#( an imme$ia#e in&rea"e inA i!o# a!e oi! +re""re

b S+ee$er "+ring %or&e

& &om+en"a#ion nee$!e a!e &!earan&e

D&en#ri%ga! %or&e on #(e %!,weig(#"

1%2; &he reason !hy the pneumatic reversible roller guide of fuel pump could oscillate is

ain&orre &!earan&e in #(e air &,!in$er gi$ewa,? reer"e arm b"(ing

b#oo !arge air +re""re $ro+

&in"%%i&ien# air "++!,$a!! o% aboe

1%"; Reasons for e)haust valve hammering could be4

a$e%i&ien&, in oi! "++!, berror" in air "+ring

&e*&e""ie !ea'age in #(e oi! ","#em

$a!! o% aboe1%%; error in the air spring system causing e)haust valve hammer can be due toI

aair +re""re #oo (ig(

bma!a$j"#e$ "a%e#,? $rain a!e

&"++!, +re""re no# &orre"+on$ing wi#( "a%e#, a!e o+ening +re""re

$a!! o% aboe1%(;deficiency in oil supply causing e)haust valve hammering can be due to4

a%oaming oi! $e #o air !ea' a# +m+ "ion b#oo !ow oi! "++!, +re""re

&#oo (ig( oi! #em+era#re @)CC &a"ing !ow i"&o&i#,$a!! o% aboe

1%*; e)cessive difference bet!een combustion pressure and compression pressure in a M# cylinder can be due to4

a!ow "&aenge air +re""re b&(ange in e*(a"# a!e #iming

&brn# e*(a"# a!e"

$a!! o% aboe1%,;the difference bet!een !ater !ashing and dry cleaning the &C turbine is

a#(ere i" no $i%%eren&e one i" we# #(e o#(er i" $r,

bwe# wa"(ing reire" re$&e$ !oa$

&$r, &!eaning reire" re$&e$ !oa$

$none o% #(e aboe1%/; oscillations of pneumatic reversible roller guide for fuel pump can cause4

ame&(ani&a! $amage #o air &,!in$er

b!ea'age" on manoeering air

&!o"" o% engine manoeeribi!i#,$a!! o% aboe

1%0; During manoevering the M#CA feed rate is usually

a12H o% "eri&e %ee$ ra#e

bH0&200

$3001(;&he difference bet!een the ma) combustion pressure and compression pressure in a 2 stroe engine cylinder unit is

a40 bar"


33/45

b10 bar"

&70 bar"

$6H bar"1(1; &he air spring pressure to prevent M# e)haust valve hammer is in the region ofI

a2 'g

b7'g

&12 'g$14 'g

1(2. our indicator diagram from one of the main engine cylinders is sho!n. 7 Comp normal3 7 Ma) is lo!44What ind of

steps do you thin is necessary to rectify the failure?

A C(e&' %e! injeor a!e %e! injeion #iming %e! +m+ "ion a!e an$ %e! +m+ !ea$B C!ean air &oo!er an$ #rbo&(arger air &oo!er

C A$j"# %e! +m+ !ea$ on!, $ring o+era#ion

D In&rea"e %e! +m+ "e##ing.1(".our indicator diagram is as sho!n. What ind of steps do you thin are necessary to rectify the failure? 7c normal pm

high

A C(e&' i% %e! injeion i" #oo ear!, or %e! +m+ !ea$ #oo !arge

B C(e&' i% %e! injeion a!e i" &orre!, b, a$j"#e$.

C C(e&' #(a# ,o (ae &orre!, i"&o"i#,?%e! +re(ea#ing.D 5e+!a&e #(e %e! a!e.

1(%.< dra!n indicator diagram from one of the main engine cylinders is as sho!n. What ind of steps are necessary to rectify

the failure?Ipc and pm both lo!

A Oer(a! #(e ni# #o $e#ermine %a!#" "&( a": +i"#on ring b!ow-b, e*(a"# a!e ma!%nion &!ogge$ "&aenging +or#"

$e!a,e$ igni#ion e#&.B A$j"# %e! +m+ !ea$ #o inje more %e! "o a" #o main#ain +ower ba!an&e

C C(ange %e! injeion a!e

D C(e&' %e! +m+ "a%e#, a!e.1((.During inspection of piston and liners through scavenging ports3 piston rings on all units !ere found as sho!n micro

sei9ure;. &he best !ay to stop its progress is'

A In&rea"e &,!in$er oi! &on"m+#ion $e#ermine %e! a!i#, an$ rea$j"# #(e %e! oi! +ri%ier"

B In&rea"e &,!in$er oi! &on"m+#ionC 5e+!a&e a!! +i"#on ring"

D 5n engine a# !ower !oa$.1(*.During inspection and calibration of one unit3 you observe the situation sho!n. &he conclusion is clover leafing. &he main

engine uses high grade &=@ cylinder oil. What do you have to do in order to reduce !ear?Idepression on either side of all lub

orificesIlie 1 paise coin

A De&rea"e ja&'e# &oo!ing wa#er #em+era#re #o aoi$ (ea# "#re""B In&rea"e #(e ja&'e# &oo!ing wa#er #em+era#re #o aoi$ #(e "!+(r $ew +oin#

C In&rea"e &,!in$er oi! &on"m+#ion #o ne#ra!ie #(e "!+(r D Con#a engine ma'er %or a$i&e.

1(,.our vessel is entering a tropical area and high humidity is e)pected. &o avoid condensation in the main engines air cooler

it is recommended to'

A O+era#e #(e engine wi#( "!ig(#!, o+en $rain &o&'" "&aenging #o ge# ri$ o% #(e wa#er

B 5e$&e "+ee$.

C De&rea"e #(e air #em+era#re "o +ro+er $raining &an be a&(iee$ %rom #(e air &oo!er

D In&rea"e "&aenging air #em+era#re #o aboe $ew +oin#1(/.During inspection of the cran bearing for one of the units in the main engine3 the bearing shell !as found as follo!s'

$urface of the !hite metal !as blac and very hard. 7atches of blac incrustations have !orn grooves in the >ournal. What

!as the cause?

A Dir# in #(e !bri&a#ing oi!B >rong &a"#ing o% bearing "(e!!

C >a#er in #(e !bri&a#ing oi! $ring "eri&e

D Bearing "(e!! "eri&e #ime e*&ee$e$.1(0.When carrying out piston overhaul3 it is important to clean the ring grooves properly. Why?

A o ma'e "re ga" +re""re &an en#er %ree!, on #o+ o% an$ be(in$ #(e +i"#on ring

B o ma'e #(e ring" %i# in #(e grooe

C A!! ring" m"# be &(ange$ #o main#ain a +er%e "ea!ing

D (a# +i"#on ring" &

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