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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-6

August 8, 2021

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Page 1 of 5

1. The specific gravity of Diesel is about

0.75

0.95

0.85

0.65

2. The function of a governor in automobiles is to

Limit the vehicle speed

Maximise the fuel economy

Limit the power

Maintain constant engine speed

3. Which one of the following statement correctly describes the construction of a bevel gear type differential?

The differential carrier houses differential pinion gears and side gears.

The drive shafts are splined to the differential carrier.

The left side gear and the differential carrier rotate in constant unison.

The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.

4. A heat treated glass generally used in automobiles bursts into ________ upon cracking,

None of these

Small particles

Large particles

Sharp edged fragments

5. Incorrect steering axis inclination (S.A.I.) causes

The vehicle to pull to the side of lesser inclination

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

6. The brake pedal during ABS operation

All of the above

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

Is pushed upward forcefully

7. The correct way to rectify an imbalanced wheel is to

Rotate the tyres

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

8. The connecting rod lower end is connected to the relevant ________ of crankshaft.

Big end

Small end

Journal

Crank arm

9. The ease with which petrol vaporizes is called its

Cetane number

Octane number

Oxidation

Volatility

10. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Power

Fuel consumption

Page 2 of 5

11. Two speed reverse gear arrangements is generally provided in case of

Passenger cars

Matadors

Trucks

Tractors

12. The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

P.L.A.N/4

P.L.A.N

P.L.A.N/2

2 × P.L.A.N

13. Which of the following symptom is caused as a result of brake disc run out?

Rapid wearing of the brake pads

Judder during braking

Ineffectiveness of the brakes

Localized wearing of the brake pads

14. The parking brake generally acts on

Propeller shaft

Front wheels

Front and rear wheels

Rear wheels

15. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

16. In a hydraulic power steering system, the power steering pump is driven by a

Belt driven by camshaft

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by crankshaft

17. The minimum parking brake force is generally ___________ of gross vehicle mass (GVM).

20%

10%

5%

15%

18. The basic purpose of providing caster angle on wheels is to

Bring the road contact of the tyre under the point of load

Compensate for wear in the steering linkage

Prevent uneven tyre wear

Maintain directional control

19. The information provided by the oxygen (O₂) sensor to the feedback control system is about the

Exhaust gas volume

Air flow speed

Air-fuel ratio

Air temperature

20. When the piston is at T.D.C., the volume above the piston in the combustion chamber is the

Cylinder volume

Exhaust volume

Clearance volume

None of these

Page 3 of 5

21. The advantage of the fuel injection system over the carburettor system is

Improved emission

Improved fuel efficiency

All of these

Improved power output

22. Tachometer in a vehicle measures

Speed

Fuel consumption

Distance

Engine r.p.m.

23. The valve tappet clearance is measured by

Screw pitch gauge

Vernier caliper

Feeler gauge

Engineering scale

24. The specific gravity of acid in a fully charged battery is generally

1.28

1.00

2.81

1.82

25. Which of the following bulb in a car will have the least wattage?

Ignition warning bulb

Head light bulb

Parking light bulb

Stop light bulb

26. If the valve clearances are excessively large, the problem that can arise is

Fouling of spark plug by gasoline

Incomplete valve closure

Overheating of the engine

None of these

27. The Diesel engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

None of these

Steam engines

28. The fuel that detonates easily, is

Iso-octane

Benzene

Alcohol

N-heptane

29. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too wide

Spark plug gap too small

Vapours lock in the fuel only

30. If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is

82

65

14

175

Page 4 of 5

31. Cushioning springs in clutch plate reduces

Torsional vibrations

Vehicle speed

Jerky starts

None of these

32. The octane number of compressed natural gas (CNG) is

100

90

120

110

33. The gear shift lever requires two separate motions to shift gears, and the first movement

Operates the clutch

Selects the synchronizer

Moves the synchronizer

Meshes the gears

34. The effect of having excess camber is

Hard steering

Uneven tyre wear

Excessive steering alignment torque

Too much traction

35. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Reduces intake noise

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

36. Which of the following oil is more viscous?

SAE 30

SAE 40

SAE 80

SAE 70

37. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Ethylene glycol

Freon-12

Carbon disulphide

38. The Diesel engine works on

Rankine cycle

Diesel cycle

Carnot cycle

Otto cycle

39. The specific gravity of petrol is about

1.25

0.75

0.95

0.85

40. The power source for a brake booster is

The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold

Exhaust manifold pressure

Hydraulic pump

Electricity

Page 5 of 5

41. Bead wires are made of

Aluminium

Steel

Copper

Zinc

42. The firing order for an inline four cylinder I.C. engine is

1-3-4-2

1-2-3-4

1-3-2-4

1-2-4-3

43. The function of an alternator in an automobile is to

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Supply electric power

Continually recharges the battery

44. The forced fed lubrication system means that the oil is delivered to the engine by

Splashing action of the crankshaft

The pressure created by the oil pump

Gravity

None of these

45. The negative terminal post on the top of a battery is

Of the same size as the positive terminal post

Larger than the positive terminal post

None of these

Smaller than the positive terminal post

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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