akidszone.com – MCQs, Mock Tests | Engineering Automobile Engineering MCQ Set 02

1 In Diesel engines, the duration between the time of injection and the time of ignition is called

A Spill cut-off B Delay period C Injection period D Ignition period

✅ Correct Answer: 2

2 In bias ply tyres

A All plies run parallel to one another (B) (D) B Belts of steel mesh are used in the tyres C One ply layer runs diagonally one way and another layer runs diagonally the other way D All of the above

✅ Correct Answer: 3

3 The aluminium alloy is used in cylinder blocks because

A It is lighter and has good heat dissipation characteristics B Material cost is low C It does not require any cylinder liners D The piston is also made of aluminium alloy

✅ Correct Answer: 1

4 The main function of the tread pattern on tyre is that

A The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating B The crests between the tread grooves absorb road noise C In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface D The tread pattern protects the tyre's inner carcass from small stones and pieces of glass

✅ Correct Answer: 3

5 The most commonly used supplementary restraint system (SRS) component is

A Seat belt B Brake C Airbag D Steering

✅ Correct Answer: 3

6 The major purpose of an electronically controlled automatic transmission is that this type of transmission

A Eliminates gear clutches B Eliminates the gear shaft lever C Reduces the number of automatic transmission components D Reduces shift shock and achieves more efficient transmission of engine torque

✅ Correct Answer: 4

7 The antiknock property of compression ignition engine fuel can be improved by adding

A Tetraethyl lead B Trimethyl pentane C Amyl nitrate D Hexadecane

✅ Correct Answer: 3

8 A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

A Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion B Allows the steering wheel to be turned by a greater amount when steering C Makes the steering more responsive D Reduces the amount of kickback for large steering angles

✅ Correct Answer: 1

9 If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

A Too lean mixture B Stoichiometric mixture C Most economical mixture D Too rich mixture

✅ Correct Answer: 4

10 The crescent shaped cavity on the piston head top surface is called as

A Piston oil hole B Snap ring C Valve recess D Valve clearance

✅ Correct Answer: 3

11 The crescent shaped cavity on the piston head top surface is called as

A Piston oil hole B Snap ring C Valve recess D Valve clearance

✅ Correct Answer: 3

12 The characteristic that is enhanced by the use of cylinder sleeves is

A Cooling efficiency B Resistance to wear C Lubrication performance D None of these

✅ Correct Answer: 2

13 The connecting rod connects the piston and the

A Cylinder head B Cylinder block C Camshaft D Crankshaft

✅ Correct Answer: 4

14 The three basic cylinder arrangements for automotive engines are

A Flat, radial, and V B In a row, in line, and opposed C In line, V, and opposed D V, double row, and opposed

✅ Correct Answer: 3

15 Which part of the automobile tyre is subjected to greatest flexing action?

A Bead B Side wall C Shoulder D Tread

✅ Correct Answer: 2

16 The compression ratio for Diesel engines usually lies in the range of

A 6-10 B 10-15 C 15-25 D 25-40

✅ Correct Answer: 3

17 The piston compression rings are made of

A Cast iron B Steel C Aluminium D Bronze

✅ Correct Answer: 1

18 In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as

A Release chamber B Balancer C Relief valve D Stop valve

✅ Correct Answer: 3

19 The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

A Section width to section height B Section height to section width C Wheel diameter to section height D Wheel diameter to section width

✅ Correct Answer: 2

20 The discharged lead acid battery has on its plates

A Lead peroxide (PbOâ‚‚) B Spongy lead (Pb) C Lead sulphate (PbSOâ‚„) D Sulphuric acid (Hâ‚‚SOâ‚„)

✅ Correct Answer: 3

21 In order to implement gear changes in the gear unit of an automatic transmission, a ___________ is used.

A Synchronizer B Planetary gear C Magnetic clutch D Hydraulic multi plate clutch

✅ Correct Answer: 4

22 The purpose of turning radius gauges is to measure the

A Contact areas of the tyres B Free plays of the steering wheel C Turning radius of the left and right wheels D Difference in the toe angles of the left and right wheels

✅ Correct Answer: 3

23 The natural gas is compressed in a CNG cylinder at a pressure of

A 200 bar B 220 bar C 250 bar D 300 bar

✅ Correct Answer: 1

24 Which of the following indicates multi-grade oil?

A SAE 30 B API SF C SAE20 W50 D API 50

✅ Correct Answer: 3

25 The compression ratio in petrol engine is kept less than in Diesel engine because

A It makes petrol engines lighter B Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition C Less compression ratio gives better performance D It is just customary to have less compression ratio in petrol engines

✅ Correct Answer: 2

26 The main task of a battery in automobiles is to

A Supply electricity to the alternator B Act as a reservoir or stabilizer of electricity C Supply electricity to the vehicle's electrical system at all times while the engine is running D Supply a large amount of power to turn the starter motor when the engine is being started

✅ Correct Answer: 4

27 The service brakes employed in cars are generally operated

A Mechanically B Hydraulically C Pneumatically D None of these

✅ Correct Answer: 2

28 The boiling point of Diesel fuel is in the range of

A 70Â°C to 100Â°C B 100Â°C to 120Â°C C 120Â°C to 180Â°C D 180Â°C to 360 Â°C

✅ Correct Answer: 4

29 The frequency of flashing of light per minute in a direction (side turn) indicator is about

A 9 B 90 C 900 D 9000

✅ Correct Answer: 2

30 The ignition coil is used to

A Step up current B Step down current C Step up voltage D Step down voltage

✅ Correct Answer: 3

31 The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as

A Cleaning B Priming C Scavenging D Detonation

✅ Correct Answer: 3

32 The self ignition temperature of Diesel as compared to petrol is

A Higher B Lower C Same D Depends on fuel quality

✅ Correct Answer: 2

33 With the increase of battery temperature, the specific gravity of electrolyte

A Increases B Decreases C Remains the same D None of these

✅ Correct Answer: 2

34 The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

A Supercharging B Auto ignition C Scavenging D Detonation

✅ Correct Answer: 1

35 In aluminium cylinder blocks, the cylinder liners are made of (A)

A Aluminium B Ceramic C Brass D Cast iron

✅ Correct Answer: 4

36 The purpose of a balancer shaft is to

A Balance the timing in the movement of the two groups of pistons B Increase inertia force of the rotating crankshaft C Reduce vibrations caused by the crankshaft rotation D Adjusts the timing of the intake and exhaust valve openings

✅ Correct Answer: 3

37 The caster is called positive when the top of the king pin is inclined to the

A Rear of the vehicle B Front of the vehicle C Left of the vehicle D Right of the vehicle

✅ Correct Answer: 1

38 In Spark Ignition Engine

A Only air is introduced into the cylinder B The mixture of air and fuel is introduced into the cylinder from carburettor C Both (A) and (B) D None of these

✅ Correct Answer: 2

39 The caster is called positive when the top of the king pin is inclined to the

A Rear of the vehicle B Front of the vehicle C Left of the vehicle D Right of the vehicle

✅ Correct Answer: 1

40 The main purpose of an engine's air cleaner is that it

A Controls the engine's air intake volume B Reduces the engine's air intake noise C Prevents rain water from entering the engine D Prevents dust and other foreign matter from entering the engine

✅ Correct Answer: 4

41 The device for smoothening out the power impulses from the engine is called

A Clutch B Differential C Flywheel D Torque converter

✅ Correct Answer: 3

42 The main function of a master cylinder is to

A Adjust the extent of brake pedal free play B Boost the force applied to brake pedal C Convert brake pedal force into hydraulic pressure D Ensure that all the wheel brakes are supplied with the same amount of fluid pressure

✅ Correct Answer: 3

43 The exhaust gas from petrol engine contains

A Petrol vapours B Water vapours C Carbon monoxide D All of these

✅ Correct Answer: 4

44 The firing order for an opposed four cylinder l.C. engine is

A 1-2-3-4 B 1-3-4-2 C 1-4-3-2 D 1-3-2-4

✅ Correct Answer: 3

45 The function of positive crankcase ventilation (PCV) system is that it

A Mixes fuel with air B Promotes combustion by creating a swirling movement in the air-fuel mixture C Returns blow by gases from the crankcase to the intake system D Feeds blow by gases to the exhaust manifold

✅ Correct Answer: 3

46 The two kinds of piston rings are

A Compression and oil control rings B Compression and sliding seal rings C Oil scrapper and oil control rings D Pressure and sealing rings

✅ Correct Answer: 1

47 The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

A Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads B Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads C Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads D Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads

✅ Correct Answer: 2

48 The basic purpose of a four wheel drive (4WD) system is that it

A Delivers improved cornering on dry road surfaces B Eliminates the need of snow tyres, tyre chains, etc. C Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces D Ensures that effective braking can be performed, even on slippery surfaces

✅ Correct Answer: 3

49 Ensures that effective braking can be performed, even on slippery surfaces

A Radiation only B Convention only C Convection and radiation D Conduction, convection and radiation

✅ Correct Answer: 3

50 The purpose of a thermostat in an engine cooling system is to

A Prevent the coolant from boiling B Allow the engine to warm up quickly C Indicate the coolant temperature D Pressurise the system to raise the boiling point

✅ Correct Answer: 2

51 The basic characteristics of a brake fluid is

A A high boiling point B Low viscosity C Compatibility with rubber and metal parts D All of these

✅ Correct Answer: 4

52 Caster is a

A Forward tilt of the kingpin B Backward tilt of the kingpin C Either 'A' or 'B' D None of these

✅ Correct Answer: 3

53 A front stabilizer bar is used to

A Increase vehicle load carrying capacity B Provide a softer ride C Control suspension movement and body roll D All of the above

✅ Correct Answer: 3

54 The timing belt is attached to the camshaft pulley and

A Timing belt drive pulley B Distributor C Radiator fan pulley D Alternator pulley

✅ Correct Answer: 1

55 A battery can be charged by

A Adding distilled water B Adding sulphuric acid C Applying voltage in the reverse direction to that of charging D Applying a voltage in the same direction to that of charging

✅ Correct Answer: 3

56 When the front wheels of a vehicle are locked during braking, then

A Stopping distance becomes extremely long B Front tyres skid across the road surface, and the vehicle spins around C (C) (D) D Driver loses control over the steering, and the vehicle continues moving in its current direction

✅ Correct Answer: 4

57 The order in which effort applied to the steering wheel is transferred to the front wheel is

A Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels B Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels C Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels D Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels

✅ Correct Answer: 2

58 The best fuels for compression ignition engines are

A Straight chain paraffin (B) (C) (D) B Aromatics C Branched chain paraffin D Naphthalene

✅ Correct Answer: 4

59 An oil filter bypass valve opens when the

A Engine is cold B Engine overheats (C) (D) C Oil filter becomes clogged D Engine runs at high speed

✅ Correct Answer: 3

60 Damper is also known as

A Shock absorber (B) (C) (D) B Torsion bar C Spring D Radius rod

✅ Correct Answer: 1

61 The main characteristics of a maintenance free (MF) battery is that

A A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid B A maintenance free battery has a relatively short shelf life when compared with standard batteries C Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water D Recharging of a maintenance free battery is neither required nor possible

✅ Correct Answer: 3

62 The most accurate ignition system of a spark ignition engine is

A Magneto system B Battery system C Electronic control unit system D Magneto and electronic system

✅ Correct Answer: 3

63 The main function of a resonator is that it (A)

A Regulates the intake air flow rate B Reduces the intake air noise (C) (D) C Enhances intake efficiency D Regulates the intake air temperature

✅ Correct Answer: 2

64 The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

A Enable the pump's fault diagnosis function to operate B Warm up and lubricate the pump C Warm up and lubricate the pump (C) Supplies a large amount of fuel and thereby creates a choke effect D Pressurise the fuel system before the engine is started

✅ Correct Answer: 4

65 In which of the following conditions, the idle CO percentage should be measured with the vehicle?

A Headlights and other electrical devices are switched off B Headlights and other electrical devices are switched on C Headlights and other lights are switched off D Headlights are switched on

✅ Correct Answer: 1

66 The mechanical efficiency (Î·m) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

A I.P/B.P. B B.P/I.P C B.P/F.P. D F.P/B.P.

✅ Correct Answer: 2

67 The combustion process in a Diesel engine is a

A Constant volume process B Constant pressure process C Constant temperature process D Adiabatic process

✅ Correct Answer: 2

68 The damper fluid leakage typically occur from

A Upper damper mounting B Bottom of damper C Clearance between inner and outer tubes of damper D Coil spring mounting

✅ Correct Answer: 3

69 The tyre rotation is generally done at

A 1000 km B 4000 km C 6000 km D 10,000 km

✅ Correct Answer: 4

70 An under-inflated tyre will wear the tread most

A Near the centre B Near the edges C In the lateral direction D In the cross direction

✅ Correct Answer: 3

71 The purpose of a cylinder head gasket is to

A Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head B Prevent engine oil from going into combustion chamber C Removes impurities from cylinder head lubricating oil D None of the above

✅ Correct Answer: 1

72 During suction stroke, the inside pressure of cylinder is

A More than the atmospheric pressure B Less than the atmospheric pressure C Equal to the atmospheric pressure D None of these

✅ Correct Answer: 2

73 The function of an oil control orifice is that it

A Returns cylinder head lubricating oil to the oil pan at high speed B Turns oil into fine mist for spray lubrication C Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes D Removes impurities from cylinder head lubricating oil

✅ Correct Answer: 3

74 Which of the following parameter can be adjusted by modifying the tie rod attachment length?

A Camber B Caster C Toe D Steering gear ratio

✅ Correct Answer: 3

75 The lubrication oil flow in an engine is in the order as

A Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan B Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan C Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan D Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan

✅ Correct Answer: 1

76 A three way catalytic converter

A Re-circulates exhaust gases B Burns fuel vapour gases C Reduces Nâ‚‚, Hâ‚‚O, and COâ‚‚ emission levels D Removes CO, HC, and NOâ‚‚ from the exhaust gases passing through it

✅ Correct Answer: 4

77 The fuel pump in the programmed fuel injection (PFI) system is located

A Between the fuel filler pipe and fuel tank B In the fuel tank C On the distributor mounting in the engine compartment D On the engine compartment bulkhead

✅ Correct Answer: 2

78 The basic purpose of tyre rotation on automobiles is to

A Avoid ply separation B Equalize wear C Get better ride D None of these

✅ Correct Answer: 2

79 Which of the following is not an automobile?

A Motor cycle B Passenger car C Aeroplane D Truck

✅ Correct Answer: 3

80 The ignition in a spark ignition engine takes place when the piston is

A Exactly at the T.D.C. position on its compression stroke B Approaching the T.D.C. position on its compression stroke C Leaving the T.D.C. position on its compression stroke D Approaching the T.D.C position on its exhaust stroke

✅ Correct Answer: 2

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Automobile Engineering MCQ Set 02