Sem Vii Papers 2008

8/8/2019 Sem Vii Papers 2008

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vK.3 Theactivities,activityduofaprojectaregivenbe|ow:Activityt-t1-31-4

Duration Davs Manpower required22U

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4JDraw the network and fJnd out

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i) Criticatpathii) . Minimum project duration requirediii) Determine minimurn no of persons required.Following data is provided for capacity planning activity. End proouct A is consisting ofomponents c and D of one unit each. End prdduct g ls consisting of D, one unit aio E two unltsach' Each E requires 2 units of F. considei '1, week r"io tiru p.r operation. Determine capacityi:|,ffi: for work centers by capacity billfor alf periods rnJ oy i"rour." profife for period nos

Ug!!*r production schedute (in units) :

Routing and standard time dataEndproducts Lotsizes Operation Workcenter Standardsetup hours Standard run timehours per unit4U 1of1 100 t.u .0251250.c/ct75J67

20 1of 1 100 1,040 1of 2 200 1.02af2 300 1.0D 60 1of 1 200 2.0E 100 1of1 2AA 2.A .080n42500 1of 1 2A0 2.A

Attempt any twoConsider the following information about anOrdering cost = Rs.32iorderInventory carrying cost = $2/unit/week

End product T 2 3 4 5 oA 4A 40 35 35 38 38B 25 25 30 30 22 22

end product item:2


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Determine the number of orders that should be placed per year to replenish the inventory of theitem based on the average weekly demand.Determine the sequence of planned orders using the economic order quantity, periodic orderquantity and part period balancing procedures. balculate the inventory "urryln[-cost on thebasis of weekly ending inventory values. Which procedure produces the lowest total cost.forthe eight'week period?A cornpany has received the following jobs at work centre to be processed. The processing time(in day), arrival data (in terms of shop cale,ndar days) are given, Determine the sequence inwhich these jobs shourd be processed according to th-e iollowiig priority rures:(i) EDD(ii)Order Slack.

{

JobAProcessing Time{Days)

Arrival date{Shop calander day) due date(Shop catander day)_:185*200-175-

15 95B 20 110c 10 112D 30 125 235E 25 125 18G-"F 1B 130 22A-Compule average completion t in t#syste,

The following table contains information regarding the next four jobs to be schedule at thecompany (it is currenily Aprit 2)Job Job Requiredjob I ryg:ltruI9gg5I s times (days)Machine t Uacnine e- lrtacnine Sarrival rnachinedde routir,lrg,!lgr,t2 2-'.-3B Aglz 3-1-zC Aprn4 1-3-zD April6 3-2-1 j z11tt fha mcfari^f *^T1ff^:f:!?l1i:!r r_eT:inils sequencing rutes in "o'n6inrt[n. ;I*iiffi'fi;machines are idle as work begins on April 2. Use St Tall three

construct an appropriately labeled Gantt chart using vertical loading depictirrg the processingand idle times for the three machines for these four jo6s.How many days does each job wait in the queue for processing on each machine?tl.** trt( * **** {< * * *


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S{-BJECT :Note:

DfsIGtr , ol)Ans'*'er to all questions2)Figures to right indicate futrl marks

Answer the following (each for + ryrf3'].;'*i';;;dirl::.:1ff ."'$*ili1:*f ruX,ilil:."?",",'*:Hlb. Classify cams anq [olluwtrJ' L^vrF"-angle incam desig.n

". S*A advantagesofV belt over chain'

;. il;il; ;orial action in chain desigtt' nr sliding contact bear'e. Discuss different t:;i# il;;i;;ted for slidins oontact beartngA bal! mounte


5/12

b i# mq FOM for the Hevlandt cycle working with air under foilowingPn =200 atm,, pr- = 1 atm, To = 300K, X = 0.4Assume h"1t^:I.!"ng"r'"n".tiveness = g5"/" compressor isothermal:HiJtt = 70o/o' tsenitoprc'Jm.i*n.v : zi"t, and Mechanicar efficiencya why separation of gases is performed at cryogenic temperatures?b Find idear work of separation of-mixture (7g.1% Nitrog en,21% oxygennd 0.9% Argon) under the fotowi"g';.".: (Temperature duringeparation is 30o K. composition is exprLss;;; more fraction).llt *p.ration of-ail per td-m;ie or mirrure(ii) Separation of al'p"r. ki*moL of Argon(iii) Separation ?lfrgon onfy p"r kg_mote of mixture(iv) Separation oJRrlon onfi [L kg_nr"r. ;A;;;1v) Separation of Oxyg"n onfV i'er rg_mole of mixturevi) separar'"l?i?,tni,;, ;;i/;"r ks_mote of oxysenvii) Separation of Njlr"gur";ti per Kg_mote of mixrureviii) separation of Nitrole-r;;iu per kg-more of NitrogenHow is the refrig.erating effect provided in the rectification process toiefd both the 1ower" eoi[ng point .no -tni Higher Boiring poinromponents with desired purityi

Section llFor attaining temperatures berow 2 K, themethods useo are _-_rhe cop of stirring cooteisls'-'it.,rn inrr ot c_rvrl"oo,urr. for same T.he best insulatiorirr"O in .ryogenic applications is __.The vui'eumier refrigerato, *orri. with a --- compressor.what are the boiring-points o] niiiog"n, hydrogen, oxygen and herium?,.Yl[J[:"1.8.. of a diasram, describe the workins of a vuirleumierH:[:?:,i:lp of a dtagram, describe the working of a Gifrord-McMahon

A Stirring cycre refrigerator works between 300 K and 70 K. what is theop? rf the workrnj *"Jir*"ir Herium, *itn i ='1.67 and if the ratio oforumes-verv3 =1.5, what is the refrig"r"iion-"ffect per unit mass?what are the apprications of 'cryogenics, in space technorogy?,:{ffis the different types of insurations and give detairs murtilayer

. what are the different temperature. sensing erements.used in cryogenicpptications? For measuring 4 K, which ";;ilh;; w* you use?t#rffi;;,tJ" important in cryogenic svstems? Describe the working orYf,1"3:r:?tJ,:r"j pre-coorins to operate J-r coorers usins Neon,

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VEERMATA JIJABAI TECHNOLOGICAL INSTITUTE[Centra I Tech nological I nstitute, Mah arashtra State]Matunga, Mumbai-400 01 I

SEMESTER EXAMINATION November 2008 DATE OF EXAMSEMESTER & COURSE VII- B. Tech Mechanical ) TIMETIME ALLOWED 3 HRS, MARKSSUBJECT : ELECTIVE - CRYOCENTC ENGINEERINGInstructions : 1. write answers to the two sections on separate answer books.2. Figures to the right indicate full marks.3. Attempt ail questions4. Use of standard Charts tables etc for liquefaction of gases and separation of gasesis allowed.5. Assumptions made, if any, must be mentioned..

Section IQ1 Attempt the follor,rring questions.a ldeal work of separation is expressed as: (i) To(sr_sr)_(hr_ht)(ii) (Ts-Tr) A s (iii) RT6C;ln1/C; (iv) None of these.b When liquid air is in equilibrium with its vapour, the vapour compositionISiilsame as that of liquid air (ii) richer in nitrogen (iii) richer in oxvoen i;,,,,none cf tneset F:r i 3,*&r srsssiirE I trlce trql.fffiio{r systell \operanffg bedurcen fie8re l;css.re [mils and ilsotrermaf cornpression at To ] folforingfunration is made:(i) Y is the same as that of Linde Liquefaction system(ii) Y is greater than that of Linde Liquefactiori system(iii) Y is rower than that of Linde Liquefaction system(iv) None of thesed For a carnot cycle operating between 300 K and 1s0 K, the cop is(i) 112 (ii) 1 (iii) 2 (iv) Noneof thesee lf the heat rejected in the condenser increases, number of plates(i)zero (ii) tend to minimum (iii) tend to infinity (iv) None of these.f For a Linde Liquefaction system working between pr_ = 400 atm, and ps= 700 atm. determine Y(i) A.428 (ii) 0.571 (iii) 1 (iv) none of theseg For C = 5o/o, the volumetric efficiency of a reciprocating compressor( nitrogen as working substance with r = 1.4) becomJs rero for apressure ratio of ----Q2 a Compare W ioearand W "u,no1 for Liquefaction of air available at 1 atm and300 K.b compressed air at 200 atm and 300 K is expanded as under :(a) Throttling process (b) rsentropic expansion processDefine the loss of work for (a) and (b). Comment on the magnitudes ofthese losses.

For Claude Liquefaction system (PH = 400 atm, P1=1 atm, To = 300K)the inlet temperature to expander is 250 K and X = 0.95. Find Y andFOM.Assume heat exchanger effectiveness=1000/0, Compressor isothermalefficiency = 7Ao/o,lsentropic efficiency = 7Ao/o and Mechanical efficiency= 90%ORFind the ideal work for liquefaction (kJ/kg) of helium at 1 atm and 300 K

20rH Nov 20A82.40 p.m.- 5.0A pm100

2

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/F.tRv,qrA J|JABAI rEcn\t,3-iG ili_ ,,S-[Centra, Tecrnc.S,o': ]rs-_:_:e lr,,;r- a-:s::*: I ::::l

SEMESTER EXAMT} ,ATISNSEMESTER & COI.;,15BTIME ALLOWFIT;SUBJECT

Matunga. Mumca,-aJ0 0r gNovember 2008 D.{;E OF E\-i\i -i:, .r,,;.,. ;,1,,,3VII- B. Tech Mechonical 1 TIIG 2 00 p.rn._ J.00 rm3 I{RS. \1ARKS t00E COMMERCE AND ENGA-EERIA;G ECONOMICS.

5lql(20) Il0 l

IIr0 lIi

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Instr uction:1\ni wers to the two sections ffi te answer-booksr

l.nswer any two of the fonotni -*Jiscuss the types of payment syGms used in e-commerce? Disc*ssQlQlaQlbQlc

crstumer convenience, and Security aspects 6f each.Differentiate between "stored value" und "ur"u-ulated balance,,Explain the terms: Non repudiationReplay protection

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lljl." any four of rhe foilowing:Differentiate between: symmetric key and Asymmetric key en*yptionwhat is a Digital Envelope? How dois it help in obtaining se"u.iry in.-commerce transaction?what is a Digital signature? How does it help in obtaining security in e*commerce transaction? '-^r '' vurc'.u* Dsr'txrrty lrl c- IWhat is a payment Gateway? How does it authorize the payment? |*u- lAnsweranytwoofthefrllo*ioffi' --- J

i*Ctef$,lm [I-dry.* n'zulinec:l'ff Fi r-.-rlr -r-r- '*ffi*..-'.a-ttie of fu, [.qJili.rJriri rhereaftr. caricuiare annua.! depreciation for first; ,hrT y.ears and. book 'a.lue ar the end of three ,vears using ,rr"igl,t Hn._mgthqg and reduced balance method.Agric ultural commodities atview of this explain why the incomes of farmers fall (i) after a go'cl

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harvest and (ii) in comparision to the incomes in othei secf"r; ;-economy.Explain law of demand with its' assumptions and exceptions,Explain the payback iime method and its limitations witiluitabteexamples. What are its merits?

cgllanr expects a MARR of to"zo. select @NPV and AC methods.ORSelect the best alternative using IRR method with incremental analvsis.

three project s under consideration.A B CInvestment 10,000 12.000 15,000Net cash flow 2,300 2,800 4,46VLife (Yrs) 5 ) )Scrap value (Rs.) 10,000 ZERO ZERO


8/12

il'{latunga, Munrbair-400 C 1SE\IESTEREXAIINATIO\ \'oterncer 2AA8SE\MSTER & COLRSETI\lE ALLOWEDSLBJECT :Note: 1) Answer g{ questions

2) Figures to tharight ndicatefull marks':i Use of 8085 Instruction Set prmified'1. Answer the following:-. ilspecis the conten'ts of the registers and the flag status as the fotlowing instructions art;"executed.ABCSZCy

MVI A,7FHADI A, OlHMVI B,8OHADD BINR AOUT PORTO1HHLT\\hat *ill be the outPut on PORT01H?

iilSpacr$.rhecontsnlsoftheaccumulatorandthestatusofcarry.flag*trenthefollorrrn..insuctlsils e.e erecuted. canr #arus i-r zero rnitialll-ar\f\"[.L A-A'H hl ]f\-1 A* {4'HOR{ A ORA' ARLC RALiii) Calculate the delay in the following loop, assuming the system clock period is 0.33p;;.

YII- B. Tech ilechanical I-i HRS.MECHATROTVICS

DATE OF EXAMTIt\'{EMARKS

7rH Nov 20082.0a p.m.- 5.00 Pmla0

Label MnernonicsLXI B' 12FFH

[20]

following sections:- [10]

DELAY: DCX BXTHLXTHLNOPNOPMOV A,CORA BJNZ DELAY

8085 T- states10

616164444$t7

, rn6 A set of eight data bytes rc gr-u* below. check each data byte for bits Dr and Do' If bits- Dr or Do = 1, reject the data bytes. How many data bytes will be accepted from the given data?Data; 80, t2, EB, 78, F2,67,35,62'2. Answer anv two from the following:-: ; sk;i"frffi"",tonal block diaeram of 8085 and explain the\/ i) Register AnaYii) Timing & Control section

b)Explain the features of g0g6 processor. compare the featt*es of 8088 with 8085 proclssor' [1'0], 'With a neat sketch explain the functional block diagram of 8255A programmable parallel [10]'' ' UO interface. What are its applications?


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3.ffira*the flow chart and write the assembly level program for the subtraction of a 2 digit [10]v hexadecimal number from anothetiligi t"*udr"i*ir number. store the numbers and t'eresult of subtraction.b) Draw the flow chart and write the assembry .1ev9l nrograrn for selectirrg and storing the [10]negative numbers from a set of ten hexadecimal numbers given below:-nita (H) : 7F, 80, AF,77, c2, 08, 59,D3, El'68'

4. Answer at.rv two from the following:-, il sketch the functionar block diagpam of g253 | gzs4programmablernterval rimer. Explain nOlV some of the "ppfi*ti""s of thiJinterfacing chip in a 8085 based microcomputer systenr'

b) Explain how a stepper motgr can be.interfaced with a g0g5 based microcomputer system [0]using 8255A i#if;.; chip. Explain the hardware and software requirements'ExplaintheworkingofaSuccessiveApproximationtypeofAnalogtoDigitalconverter.tl0]A strain gauge Uarei load cell is to be inierfaced with 8085 based microcomputer sysetnusing*-noctodisplaytheloadinkg.Sketchthearrangement.

5.a) sketch a Logical AND function pneumatic circuit consisting of the following componerrts' [10]to actuale a double acting cylinder, when inputs are given through manually operated'push button type and ,pring return 3l2way valves A and B, both normally closed initiallyf1|l ffiUlay push butron, splms return valves A and B for inputsr-lii) AND signal processor Two Position valve"ofu) One 5/2-wrypilot o-pe-rated' spring retum control valve','v) One double acting CYlinder'

,, b) Sketch the circuit diagram for an electro pnelqlatl: system consisting of two double acling [10' cylinders ( A and B ), tw. 512 double soienoid valves, proximity sensors for sensing innerand outer positions of pistons and a PLC'Sketch the hdi;; ilgiJ ai"g** fo, ,"q.t"nting of cylinders in the order A* B" B- A"'


10/12

VEERMATA JIJABAI TECHNOLOGICAL NNSTITUTH[Central Technologicat Institute, Maharashtra State]Matunga, Mumbai-40O 01 I

EXAMTNATION November 2008 DATE OF EXAM& COUiSE VII- B. TCC| MCC\ANiCAI ) TIMEALLOWED 3 HRS.. fM I 'ffr,f/ MARKS: FINITE ELEMENT METHOD

lnstructions : 1' Alt questions carry equal marks'2. Figures to the right indicate marks'3. Question 1 is comPutsorY'4. Assume suitable data' if necessary'A I '$dl True or False' Rectify if false'

trA1"H Nov 20{}82.A# p.m.- 5.00 Pm100

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l.ErrorinFiniteElementMethodcanbereducedbyusinglessnumber of low order elements'2.Finitedifferencg'"tnoogivesbetteraccurateresu|tswhenmorenon-onitorm sub-interval length is used"'3. The first output of FEM is frimary variables at any point in tl'teigiven domain'4' Number of primary Variables is same as that of the $*cCIrrde;try'" o.iirut"s and is equal to the order of the elernent"5'Newton-Cot''*"tnoohastotakesamplingpointsato|}:'tinterval, whose r1uruliis equal to the degree of the integraild.6. in" O"grte of the cubic element is 2'7. The residu. "*og"i whenthe solution assumed for Go';e:rning

Differential Equation is exact one'S.tnassemblyproblemsEl.l4Esuseddirectlyarederi.;ecu:-i^cRafle;gh-nliz rret-hcc "nac'pec oner eniire c'Tal'g Tietght F-^*:: is zer: tsi 3 poifii \41-eE ::e ti '? :"'rl--?tsotrndary Condrhon ts zero"10.Trigono."t* tpproximatons are of no use in FEM{b) Define:

. r. Order of the Element/rt. P-h method.iii. Post Processing'-iv. Pre-ProcessingMathematical rnodel in FEM

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Q.2la}-So|vethefo||owingdifferentialequationbyusingi:initmDlffelence{0t;}-'- '/ Method. Take 4 sub-intervals'compare the values at satieiipoints with exac| sr'rlution^ {0lt)GDE: *-9u+3x=0, BCs: u(0) = 2' u(0'8)='4dx-Howwil|youinterpo|atetheprirnaryvariableinthegivrendni.naiit


11/12

(.qI Arralyse the Vei.ical Taper bar shown in figure completely,

5a $o{,& ctoJL-

*go cnraaS.'f 2-5KN{*'r., ' i'g l\ lv\{"} i p,or* GCM and GME for the Fluid network shown below

3 = lo r.n/n3F t lEo 6PaTote "lroa linear u)ewn9,o louter h^JF & ar'&ri^ "$w h"JF

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What are Connectivity Conditions in FEM? (04)write the salient features emerging out of the weak Forrn in Ritz t04)Method.Using Ritz rnethod with 2 parameters, solve the field equation given (06)in Q.3 {a) above:

'n-1PiV vusisfznca g. =tzWher'4!

t-:5a fnb:6vr..t-=furo,D= 7cr{l

Q.:i (a) Solve the given differential equation using any 2 methods out of thefollowing methods:,.).. P-G Method"j1. Galerkin Methodiii. Sub-dcmain MethodCompare the answers with exact solutions2., =.---GDE; Z++5u_xr =0BCs . u(0) = 0, u(1)= 3

{b} what are the various sources of Error in FEM? \Nhat are the (04}measures to reduce the errors?--oR---

L= Tdle 6crr'r


12/12

compare with exact solution and tell the measures to reduce theerror.(c) Use Newton-Cotes Method to solve following integral :

Mzs = J(x +t)Sz Ss dx, limits are from 0 to he,Where ,4z = 4 (x/he) (1-x/he), Ss = - (x/he)(1-2 xthe)Weighting co-efficients are given in the table .

r w1 w2 w3 w4 w5 w6 w77t90 32t90 12t9A 32190 Ttga1 91288 75t288 50/288 50/288 75t288 1St28B41!840 216t84A 27!840 272t84A 27t840 216t840 41t84A

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,-f* use Rayleigh Ritz Method for the following differential equation to getEME and solve further. Follow the steps given below.GDE : , fo : c:onfunf

6Cs I U(o) =e, u(r-) =vrlnte for a general element in local co-or-cjinate sysiem:trtsD of Gen erai E ere:t

r'.33."1 .-."* :-' n'r-; 3f *:::- ^ _]S= i--3 llft,e{ ::;-- -,15: jlfai{g S iifi-tE:af ,-:eri{o|a:,:,-i-rc:rCo-efrCIent mafix. cepacitance matrix, externai sourcernatrix, internal source matrixGME using 3 linear elementsNodal p.v.s, s.v.sComparison

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Sem Vii Papers 2008