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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. Engine misfiring is likely to result from

Spark plug gap too small

Spark plug gap too wide

Vapours lock in the fuel only

Incorrect fuel air mixture

2. The specific gravity of Diesel is about

0.75

0.85

0.95

0.65

3. Wheel base of a vehicle is the

Extreme length of the vehicle

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Distance between the centres of the rear tyres

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

Overheating of the engine

Fouling of spark plug by gasoline

None of these

Incomplete valve closure

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

1.82

1.28

2.81

1.00

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

Stop light bulb

Parking light bulb

Ignition warning bulb

Head light bulb

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

14

65

82

175

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

Localized wearing of the brake pads

Judder during braking

Rapid wearing of the brake pads

Ineffectiveness of the brakes

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

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the tyre pressure

10. Tachometer in a vehicle measures

Fuel consumption

Speed

Distance

Engine r.p.m.

Page 2 of 5

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

Passenger cars

Tractors

Trucks

Matadors

12. The parking brake generally acts on

Propeller shaft

Front and rear wheels

Rear wheels

Front wheels

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

10%

20%

15%

5%

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

The drive shafts are splined to the differential carrier.

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

15. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

None of these

Torsional vibrations

16. The specific gravity of petrol is about

0.85

0.95

1.25

0.75

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

None of these

Smaller than the positive terminal post

Larger than the positive terminal post

Of the same size as the positive terminal post

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

Selects the synchronizer

Meshes the gears

Moves the synchronizer

Operates the clutch

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

Clearance volume

None of these

Exhaust volume

Cylinder volume

20. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Carbon disulphide

Ammonium chloride

Page 3 of 5

21. The function of a governor in automobiles is to

Limit the power

Maintain constant engine speed

Limit the vehicle speed

Maximise the fuel economy

22. Odometer is an instrument used for measurement of

Distance

Power

Engine r.p.m.

Fuel consumption

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

Gravity

The pressure created by the oil pump

None of these

Splashing action of the crankshaft

24. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Reduces intake noise

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

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

Partly converts engine power into electric power

Supply electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

26. The ease with which petrol vaporizes is called its

Octane number

Cetane number

Volatility

Oxidation

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

1-2-3-4

1-2-4-3

1-3-2-4

1-3-4-2

28. The fuel that detonates easily, is

Benzene

N-heptane

Iso-octane

Alcohol

29. 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/2

P.L.A.N/4

2 × P.L.A.N

P.L.A.N

30. The power source for a brake booster is

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

Hydraulic pump

Exhaust manifold pressure

Electricity

Page 4 of 5

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

None of these

Small particles

Sharp edged fragments

Large particles

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

Small end

Big end

Crank arm

Journal

33. The effect of having excess camber is

Too much traction

Hard steering

Excessive steering alignment torque

Uneven tyre wear

34. The brake pedal during ABS operation

Pedal stroke becomes longer

Is pushed upward forcefully

All of the above

Transmits slight kickback to the driver's foot

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

100

90

120

110

36. The Diesel engines are also known as

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

None of these

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

Improved emission

All of these

Improved power output

Improved fuel efficiency

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

Exhaust gas volume

Air flow speed

Air temperature

Air-fuel ratio

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

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by camshaft

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

Tendency to assume toe-out orientation

The vehicle to pull to the side of lesser inclination

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

Page 5 of 5

41. Bead wires are made of

Zinc

Copper

Aluminium

Steel

42. The valve tappet clearance is measured by

Engineering scale

Feeler gauge

Vernier caliper

Screw pitch gauge

43. The Diesel engine works on

Diesel cycle

Rankine cycle

Carnot cycle

Otto cycle

44. Which of the following oil is more viscous?

SAE 70

SAE 40

SAE 30

SAE 80

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

Prevent uneven tyre wear

Compensate for wear in the steering linkage

Maintain directional control

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

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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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