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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. Bead wires are made of

Copper

Aluminium

Steel

Zinc

2. The power source for a brake booster is

Exhaust manifold pressure

Electricity

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

Hydraulic pump

3. The Diesel engines are also known as

None of these

Spark ignition (S.I.) engines

Steam engines

Compression ignition (C.I.) engines

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 function of a governor in automobiles is to

Limit the power

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

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

Adjust the tyre pressure

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

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

1.82

2.81

1.00

1.28

8. Wheel base of a vehicle is the

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

Extreme length of the vehicle

9. Tachometer in a vehicle measures

Engine r.p.m.

Fuel consumption

Distance

Speed

10. The Diesel engine works on

Carnot cycle

Rankine cycle

Diesel cycle

Otto cycle

Page 2 of 5

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

110

100

90

120

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

Prevent uneven tyre wear

Maintain directional control

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

Compensate for wear in the steering linkage

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

82

65

14

175

14. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Fuel consumption

Power

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

None of these

Gravity

Splashing action of the crankshaft

The pressure created by the oil pump

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

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

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

Head light bulb

Parking light bulb

Ignition warning bulb

Stop light bulb

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

Operates the clutch

Selects the synchronizer

Meshes the gears

Moves the synchronizer

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

Improved emission

All of these

Improved power output

Improved fuel efficiency

20. 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; each pinion gear meshes with a different side gear.

The drive shafts are splined to the differential carrier.

The differential carrier houses differential pinion gears and side gears.

Page 3 of 5

21. The valve tappet clearance is measured by

Screw pitch gauge

Engineering scale

Feeler gauge

Vernier caliper

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

Passenger cars

Trucks

Tractors

Matadors

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

Of the same size as the positive terminal post

None of these

Smaller than the positive terminal post

Larger than the positive terminal post

24. The specific gravity of petrol is about

0.75

0.85

0.95

1.25

25. The fuel that detonates easily, is

Alcohol

N-heptane

Benzene

Iso-octane

26. 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

2 × P.L.A.N

P.L.A.N/4

P.L.A.N

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

Small particles

None of these

Sharp edged fragments

Large particles

28. The parking brake generally acts on

Front wheels

Rear wheels

Front and rear wheels

Propeller shaft

29. The effect of having excess camber is

Too much traction

Hard steering

Uneven tyre wear

Excessive steering alignment torque

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

Crank arm

Big end

Small end

Journal

Page 4 of 5

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

Generation of a braking effect at tight corners

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

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

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

Localized wearing of the brake pads

33. The commonly used antifreeze solution in automobiles is

Freon-12

Ethylene glycol

Carbon disulphide

Ammonium chloride

34. The ease with which petrol vaporizes is called its

Octane number

Oxidation

Volatility

Cetane number

35. 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

36. Cushioning springs in clutch plate reduces

Jerky starts

Torsional vibrations

Vehicle speed

None of these

37. Which of the following oil is more viscous?

SAE 70

SAE 80

SAE 30

SAE 40

38. The specific gravity of Diesel is about

0.75

0.85

0.95

0.65

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

1-3-4-2

1-3-2-4

1-2-4-3

1-2-3-4

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

Clearance volume

Cylinder volume

None of these

Exhaust volume

Page 5 of 5

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

Exhaust gas volume

Air-fuel ratio

Air flow speed

Air temperature

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

Continually recharges the battery

Supply electric power

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

43. The main function of intake manifold is that it

Reduces intake noise

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

44. 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

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

5%

20%

15%

10%

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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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