Automobile Test 1

8/9/2019 Automobile Test 1

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Department of Mechanical Engineering, Poornima Collegeof Engineering, Jaipur

Sub: Automobile Engineering Test 1 MaxTime: ! MinsAttempt All the "uestions Date1. The condition that causes vapor locking in a brake system isA. overheating of the uid due to frequent brake applicationB. overcooling of the brakes during high speed drivingC. keeping the vehicle without use for an etended period

!. an ecessively high engine speed on a downhill road

". The portion of a crankshaft which rests on cylinder block is called main #ournal.A. $es B. %o &. The motion of the cam is transferred to the valves throughA. pistons B. rocker arms C. camshaft pulley !.valve stems

'. (f the engine coolant leaks into the engine oil) then engine oilA. appears milky B. becomes foamy C. turns black !.none of these

*. The function of an alternator in an automobile is toA. supply electric power B. converts mechanical energy intoelectrical energyC. continually recharges the battery !. partly converts engine power intoelectric power

+. A clutch is usually designed to transmit maimum torque which isA. equal to the maimum engine torqueB. ,- per cent of the maimum engine torqueC. 1*- per cent of the maimum engine torque!. none of these

. /hat type of bearing is used for main bearings and connecting rod bearings0A. Ball bearings B. lain bearingsC. %eedle roller bearing !. Taper roller bearing

,. (t is necessary to maintain the valve clearances as theyA. reduce the resistance to sliding that occurs between the cam and the tappetB. allow for lengthening of the valves owing to the heat of combustionC. increase the speed at which the valves move up and down!. make the crankshaft turn smoothly

2. (ncorrect steering ais inclination 34.A.(.5 causes

A. tendency to assume toe6out orientationB. generation of a braking e7ect at tight cornersC. poor recovery of the steering wheel after making a turn!. the vehicle to pull to the side of lesser inclination

1-. The torque available at the contact between driving wheels and road is knownasA. brake e7ort B. tractive e7ort C. clutch e7ort !. none ofthese

11. A traction control system 3TC45 in automobiles controls theA. vibrations on the steering wheel

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B. engine power during accelerationC. torque that is transmitted by the tyres to the road surface!. stopping distance in case of emergency

1". (n a unit type body 3frameless body5 design) the sheet metal parts are weldedtogether) forming a frame work to which outer skin is attached.A. True B. 8alse

1&. (n radial tyresA. one ply layer runs diagonally one way and another layer runs diagonally the

other wayB. all plies run parallel to one another and vertical to tyre beadC. inner tubes are always used!. none of these

1'. The oil pump is driven by theA. camshaft B. alternator shaftC. crankshaft via drive belt !. crankshaft directly

1* (n a spark plug) when the temperature of the central electrode eceeds a certaintemperature) any carbon that has adhered will be burnt o7) and the temperature atwhich this burning o7 carbon starts is referred to as the self cleaning temperature.

A. Correct B. (ncorrect

1+ The main function of intake manifold is that itA. promotes the miture of air and fuel B. reduces intake noiseC. cools the intake air to a suitable temperature !. distributes intake air equallyto the cylinders

1. The vehicle ride will be comfortable if A. unsprung mass is kept minimum B. sprang mass is kept minimumC. vehicle mass is kept minimum !. all of these

1,. The ywheel and the pressure plate bind the clutch disc between them so that

the engine and the transmission can be engaged.A. $es B. %o

12 ositive camber is used to compensate for wheels tilting inward due to theweight of the vehicle.A. $es B. %o

"- (n automobiles 9.:./. refers toA. gross vehicle width B. gross vehicle weightC. gross vehicle wheel base !. gross vehicle wheel track

"1 The ;ring order for an in6line four cylinder (.C. engine is

A. 16"6&6' B. 16&6'6" C. 16"6'6& !.16&6"6'

"" The e7ect of having ecess camber isA. ecessive steering alignment torque B. hard steeringC. too much traction !. uneven tyre wear

"& (f the air6fuel miture in a spark ignition engine is too rich) then air6fuel ratio isaboutA. 1<1 B. 1*<1 C. 1&<1 !. 1-<1

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"' (f the air6fuel miture ignites before the spark takes place at spark plug) thecondition is calledA. detonation B. ignition C. pre6ignition !. rumble

"* The diagram which shows the correct crank positions corresponding to theopening and closing of the valves) is known asA. indicator diagram B. aial force diagramC. valve timing diagram !. none of these

"+ The information provided by the oygen 3="5 sensor to the feedback control

system is about theA. air6fuel ratio B. air temperatureC. air ow speed !. ehaust gas volume

" The battery is an electrochemical device) which means batteryA. makes chemicals by mechanical meansB. uses chemical action to provide electricityC. has curved plates instead of at plates!. does not use an electrolyte

", The operation of removing trapped air from the hydraulic braking system isknown as

A. trapping B. tapping C. bleeding !.cleaning

"2 The di7erence between !=T & and !=T ' brake uids isA. !=T ' uid has a higher boiling point than !=T & uidB. !=T ' uid has a lower boiling point than !=T & uidC. !=T & and !=T ' uids have the same boiling point) but !=T ' uid has alonger service life!. !=T ' uid is more resistant to free>ing than !=T & uid

&- The aluminium alloy is used in cylinder blocks becauseA. it is lighter and has good heat dissipation characteristics

B. material cost is lowC. it does not require any cylinder liners!. the piston is also made of aluminium alloy

&1 (n a fuel in#ection system) the electronic control module 3?C@5 calculates theoptimum fuel6in#ection volume for the engine condition based on the data receivedfrom the sensors) and in#ects this volume of fuel into the intake manifold at theoptimum timing.A. Correct B. (ncorrect

&" The tilting of the front wheels away from the vertical) when viewed from the frontof the car) is called

A. camber B. casterC. toe6in !. toe6out

&& The main function of the tread pattern on tyre is thatA. the tread grooves pass air between the tyre and road surface) therebypreventing tyre from overheatingB. the crests between the tread grooves absorb road noiseC. in wet conditions) the tread grooves epel water that is drawn between thetyre and road surface!. the tread pattern protects the tyres inner carcass from small stones andpieces of glass

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&' The compression ratio in petrol engine is kept less than in !iesel engine becauseA. it makes petrol engines lighterB. higher or equivalent compression ratio in petrol engines is not possible due topre6ignitionC. less compression ratio gives better performance!. it is #ust customary to have less compression ratio in petrol engines

&* The most commonly used supplementary restraint system 3445 component isA. seat belt B. brake C. airbag !. steering

&+ The natural gas is compressed in a C%9 cylinder at a pressure of A. "-- bar B. ""- bar C. "*- bar !.&-- bar

& The cetane rating of !iesel fuel is in the order of A. "* B. '* C. - !. 2-

&, The air gap between the central electrode and ground 3or side5 electrode of aspark plug is aroundA. -." mm B. -.* mm C. 1 mm !. 1.* mm

&2 The cetane number of a !iesel fuel is a measure of

A. volatility B. viscosity C. ignition quality !. delay period

'- The valve overlap in four stroke petrol engines is approimatelyA. &- B. +- C. 2- !. 1"-

'1 The component that connects the steering rack to the knuckles isA. tie6rod B. sector gear C. pivot !. spline

'" The coeDcient of friction for the clutch facing is approimatelyA. -.1 B. -.' C. -., !. 1."

'& The painting of automobiles is done to

A. prevent rust from growing on the body B. improve itseternal appearanceC. retain the characteristics of steel for long !. all of these

'' The main task of a battery in automobiles is toA. supply electricity to the alternatorB. act as a reservoir or stabili>er of electricityC. supply electricity to the vehicles electrical system at all times while theengine is running!. supply a large amount of power to turn the starter motor when the engine isbeing started

'* The ma#or purpose of an electronically6controlled automatic transmission is thatthis type of transmissionA. eliminates gear clutchesB. eliminates the gear shift leverC. reduces the number of automatic6transmission components!. reduces shift shock and achieves more eDcient transmission of engine torque

'+ The anti6knock property of compression ignition engine fuel can be improved byaddingA. tetraethyl lead B. trimethyl pentane C. amyl nitrate !. headecane

' The connecting rods are generally made of EEEEEEEEEE shaped cross6section.

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A. ( B. C C. F !. G

', The calori;c value of petrol is aboutA. &+.* 6 &,.* @HIkg B. &2.' 6 '".* @HIkg C. '". 6 '&.* @HIkg !. '*.* 6 '@HIkg

'2 The si>e of engine cylinder is referred in terms of itsA. diameter and bore B. displacement and eDciencyC. bore and stroke !. bore and length

*- The purpose of a cylinder head gasket is toA. prevent the combustion gases from leaking from the #oint between thecylinder block and the cylinder headB. prevent engine oil from going into combustion chamberC. removes impurities from cylinder head lubricating oil!. none of the above

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Automobile Test 1