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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

Aluminium

Steel

Copper

Zinc

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

Overheating of the engine

Incomplete valve closure

Fouling of spark plug by gasoline

None of these

3. 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

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

None of these

Of the same size as the positive terminal post

Larger than the positive terminal post

Smaller than the positive terminal post

5. The function of a governor in automobiles is to

Limit the vehicle speed

Limit the power

Maximise the fuel economy

Maintain constant engine speed

6. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Ammonium chloride

Carbon disulphide

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

2.81

1.28

1.82

1.00

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

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

Adjust the tyre pressure

Rotate the tyres

9. The fuel that detonates easily, is

Alcohol

N-heptane

Iso-octane

Benzene

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

Small particles

Sharp edged fragments

None of these

Large particles

Page 2 of 5

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

Belt driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

Chain driven by crankshaft

12. The specific gravity of petrol is about

0.75

0.95

0.85

1.25

13. Cushioning springs in clutch plate reduces

Jerky starts

Torsional vibrations

None of these

Vehicle speed

14. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 70

SAE 40

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

100

90

110

120

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

The pressure created by the oil pump

Gravity

Splashing action of the crankshaft

None of these

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

Matadors

Passenger cars

Tractors

Trucks

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

Air temperature

Air flow speed

Air-fuel ratio

Exhaust gas volume

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

82

65

175

14

20. The brake pedal during ABS operation

Pedal stroke becomes longer

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

All of the above

Page 3 of 5

21. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Extreme length of the vehicle

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

22. The Diesel engine works on

Carnot cycle

Rankine cycle

Otto cycle

Diesel cycle

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

1-2-4-3

1-2-3-4

1-3-4-2

1-3-2-4

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

Journal

Big end

Small end

Crank arm

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

All of these

Improved emission

Improved power output

Improved fuel efficiency

26. The parking brake generally acts on

Rear wheels

Propeller shaft

Front wheels

Front and rear wheels

27. Odometer is an instrument used for measurement of

Fuel consumption

Engine r.p.m.

Distance

Power

28. The valve tappet clearance is measured by

Vernier caliper

Engineering scale

Screw pitch gauge

Feeler gauge

29. Tachometer in a vehicle measures

Fuel consumption

Speed

Engine r.p.m.

Distance

30. 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

P.L.A.N/4

2 × P.L.A.N

P.L.A.N/2

Page 4 of 5

31. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too wide

Vapours lock in the fuel only

Spark plug gap too small

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

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

Generation of a braking effect at tight corners

33. The power source for a brake booster is

Electricity

Exhaust manifold pressure

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

Hydraulic pump

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

Maintain directional control

Compensate for wear in the steering linkage

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

Prevent uneven tyre wear

35. The effect of having excess camber is

Too much traction

Excessive steering alignment torque

Uneven tyre wear

Hard steering

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

20%

15%

5%

10%

37. The ease with which petrol vaporizes is called its

Volatility

Oxidation

Octane number

Cetane number

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

Ignition warning bulb

Stop light bulb

Parking light bulb

Head light bulb

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

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

The differential carrier houses differential pinion gears and side gears.

40. The Diesel engines are also known as

Steam engines

None of these

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

Page 5 of 5

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

None of these

Exhaust volume

Cylinder volume

Clearance volume

42. The specific gravity of Diesel is about

0.65

0.95

0.85

0.75

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

Supply electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

Partly converts engine power into electric power

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

Meshes the gears

Operates the clutch

Moves the synchronizer

Selects the synchronizer

45. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Reduces intake noise

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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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