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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 basic purpose of providing caster angle on wheels is to

Compensate for wear in the steering linkage

Maintain directional control

Prevent uneven tyre wear

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

2. The function of a governor in automobiles is to

Maintain constant engine speed

Limit the power

Maximise the fuel economy

Limit the vehicle speed

3. The effect of having excess camber is

Hard steering

Too much traction

Excessive steering alignment torque

Uneven tyre wear

4. The specific gravity of Diesel is about

0.65

0.85

0.95

0.75

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

5%

15%

10%

20%

6. The fuel that detonates easily, is

N-heptane

Alcohol

Benzene

Iso-octane

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

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.

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

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

Operates the clutch

Moves the synchronizer

Meshes the gears

Selects the synchronizer

9. The ease with which petrol vaporizes is called its

Oxidation

Volatility

Octane number

Cetane number

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

Journal

Crank arm

Small end

Big end

Page 2 of 5

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

The pressure created by the oil pump

Gravity

None of these

Splashing action of the crankshaft

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

175

14

82

65

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

Stop light bulb

Ignition warning bulb

Parking light bulb

Head light bulb

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

Adjust the damper spring tension

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

15. The valve tappet clearance is measured by

Engineering scale

Screw pitch gauge

Feeler gauge

Vernier caliper

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

Trucks

Passenger cars

Tractors

Matadors

17. Bead wires are made of

Steel

Aluminium

Copper

Zinc

18. 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

P.L.A.N/2

P.L.A.N/4

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

Fouling of spark plug by gasoline

None of these

Incomplete valve closure

Overheating of the engine

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

1-3-4-2

1-3-2-4

1-2-3-4

1-2-4-3

Page 3 of 5

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

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

Supply electric power

Continually recharges the battery

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

Sharp edged fragments

Large particles

None of these

Small particles

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

Clearance volume

Exhaust volume

Cylinder volume

None of these

24. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too small

Spark plug gap too wide

Vapours lock in the fuel only

25. Which of the following oil is more viscous?

SAE 70

SAE 40

SAE 80

SAE 30

26. Odometer is an instrument used for measurement of

Distance

Fuel consumption

Engine r.p.m.

Power

27. The specific gravity of petrol is about

0.95

0.85

0.75

1.25

28. 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

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

All of these

Improved fuel efficiency

Improved emission

Improved power output

30. 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 4 of 5

31. The Diesel engine works on

Diesel cycle

Rankine cycle

Carnot cycle

Otto cycle

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

Ineffectiveness of the brakes

Localized wearing of the brake pads

Rapid wearing of the brake pads

Judder during braking

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

100

110

120

90

34. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Reduces intake noise

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

35. 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

36. The Diesel engines are also known as

None of these

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

37. 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

Generation of a braking effect at tight corners

Tendency to assume toe-out orientation

38. Tachometer in a vehicle measures

Fuel consumption

Engine r.p.m.

Distance

Speed

39. Cushioning springs in clutch plate reduces

Vehicle speed

Torsional vibrations

None of these

Jerky starts

40. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Ammonium chloride

Carbon disulphide

Page 5 of 5

41. The brake pedal during ABS operation

Is pushed upward forcefully

All of the above

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

42. The parking brake generally acts on

Propeller shaft

Front wheels

Rear wheels

Front and rear wheels

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

2.81

1.82

1.28

1.00

44. 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

45. 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

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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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