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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. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Power

Fuel consumption

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

1.82

2.81

1.00

1.28

3. The valve tappet clearance is measured by

Feeler gauge

Engineering scale

Screw pitch gauge

Vernier caliper

4. Bead wires are made of

Steel

Copper

Zinc

Aluminium

5. Tachometer in a vehicle measures

Fuel consumption

Distance

Engine r.p.m.

Speed

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

Air-fuel ratio

Air temperature

Exhaust gas volume

Air flow speed

7. The specific gravity of petrol is about

1.25

0.85

0.75

0.95

8. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ethylene glycol

Ammonium chloride

Freon-12

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

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the damper spring tension

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

Parking light bulb

Stop light bulb

Head light bulb

Ignition warning bulb

Page 2 of 5

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

Improved emission

Improved fuel efficiency

Improved power output

All of these

12. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

Torsional vibrations

None of these

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

Partly converts engine power into electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

Supply electric power

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

1-3-2-4

1-2-3-4

1-3-4-2

1-2-4-3

15. The parking brake generally acts on

Front and rear wheels

Front wheels

Rear wheels

Propeller shaft

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

Larger than the positive terminal post

None of these

Smaller than the positive terminal post

Of the same size as the positive terminal post

17. The ease with which petrol vaporizes is called its

Octane number

Oxidation

Volatility

Cetane number

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

120

110

100

90

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

Incomplete valve closure

Overheating of the engine

Fouling of spark plug by gasoline

None of these

20. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

Page 3 of 5

21. Engine misfiring is likely to result from

Vapours lock in the fuel only

Incorrect fuel air mixture

Spark plug gap too small

Spark plug gap too wide

22. The Diesel engine works on

Rankine cycle

Otto cycle

Carnot cycle

Diesel cycle

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

None of these

The pressure created by the oil pump

Splashing action of the crankshaft

Gravity

24. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

Reduces intake noise

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

Trucks

Passenger cars

Tractors

Matadors

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

Compensate for wear in the steering linkage

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

Maintain directional control

Prevent uneven tyre wear

27. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 40

SAE 70

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

65

14

175

82

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

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

The differential carrier houses differential pinion gears and side gears.

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

The drive shafts are splined to the differential carrier.

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

Judder during braking

Localized wearing of the brake pads

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Page 4 of 5

31. 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

2 × P.L.A.N

P.L.A.N/2

P.L.A.N

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

20%

10%

15%

5%

33. The fuel that detonates easily, is

Iso-octane

Benzene

Alcohol

N-heptane

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

Cylinder volume

None of these

Clearance volume

Exhaust volume

35. The specific gravity of Diesel is about

0.65

0.95

0.85

0.75

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

Meshes the gears

Moves the synchronizer

Operates the clutch

Selects the synchronizer

37. The function of a governor in automobiles is to

Limit the power

Maintain constant engine speed

Maximise the fuel economy

Limit the vehicle speed

38. The power source for a brake booster is

Exhaust manifold pressure

Hydraulic pump

Electricity

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

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

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

40. The brake pedal during ABS operation

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

All of the above

Page 5 of 5

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

Belt driven by crankshaft

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by camshaft

42. 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 rear tyres

Distance between the centres of the front and rear wheels

43. The effect of having excess camber is

Hard steering

Too much traction

Uneven tyre wear

Excessive steering alignment torque

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

Sharp edged fragments

Large particles

None of these

Small particles

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

Journal

Big end

Crank arm

Small end

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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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