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

None of these

Large particles

Small particles

Sharp edged fragments

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

1.82

1.28

2.81

1.00

3. The valve tappet clearance is measured by

Feeler gauge

Engineering scale

Screw pitch gauge

Vernier caliper

4. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

Reduces intake noise

Cools the intake air to a suitable temperature

5. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Ammonium chloride

Carbon disulphide

6. The Diesel engines are also known as

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

Steam engines

7. The specific gravity of Diesel is about

0.95

0.65

0.85

0.75

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

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.

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

82

14

65

175

10. The Diesel engine works on

Otto cycle

Carnot cycle

Diesel cycle

Rankine cycle

Page 2 of 5

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

5%

20%

10%

15%

12. The power source for a brake booster is

Hydraulic pump

Exhaust manifold pressure

Electricity

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

13. 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

14. The brake pedal during ABS operation

Transmits slight kickback to the driver's foot

All of the above

Pedal stroke becomes longer

Is pushed upward forcefully

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

Matadors

Tractors

Passenger cars

Trucks

16. Cushioning springs in clutch plate reduces

Jerky starts

None of these

Torsional vibrations

Vehicle speed

17. 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

18. Odometer is an instrument used for measurement of

Engine r.p.m.

Distance

Fuel consumption

Power

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

Big end

Crank arm

Journal

Small end

20. Engine misfiring is likely to result from

Vapours lock in the fuel only

Spark plug gap too wide

Incorrect fuel air mixture

Spark plug gap too small

Page 3 of 5

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

1-2-4-3

1-2-3-4

1-3-2-4

1-3-4-2

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

Air-fuel ratio

Air flow speed

Air temperature

Exhaust gas volume

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

None of these

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

24. The ease with which petrol vaporizes is called its

Octane number

Cetane number

Oxidation

Volatility

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

Parking light bulb

Ignition warning bulb

Stop light bulb

Head light bulb

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

Fouling of spark plug by gasoline

Incomplete valve closure

None of these

Overheating of the engine

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

Moves the synchronizer

Meshes the gears

Operates the clutch

Selects the synchronizer

28. The fuel that detonates easily, is

Iso-octane

Benzene

N-heptane

Alcohol

29. 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

30. Bead wires are made of

Aluminium

Steel

Zinc

Copper

Page 4 of 5

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

Continually recharges the battery

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Supply electric power

32. The effect of having excess camber is

Too much traction

Excessive steering alignment torque

Hard steering

Uneven tyre wear

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

Rotate the tyres

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

34. 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

P.L.A.N

2 × P.L.A.N

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

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

36. Which of the following oil is more viscous?

SAE 40

SAE 30

SAE 80

SAE 70

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

100

120

110

90

38. Tachometer in a vehicle measures

Speed

Engine r.p.m.

Fuel consumption

Distance

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

Improved power output

Improved fuel efficiency

Improved emission

All of these

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

Cylinder volume

Clearance volume

Exhaust volume

None of these

Page 5 of 5

41. The parking brake generally acts on

Propeller shaft

Rear wheels

Front and rear wheels

Front wheels

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

Prevent uneven tyre wear

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

Compensate for wear in the steering linkage

Maintain directional control

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

Splashing action of the crankshaft

The pressure created by the oil pump

None of these

Gravity

44. The specific gravity of petrol is about

1.25

0.85

0.95

0.75

45. The function of a governor in automobiles is to

Maintain constant engine speed

Maximise the fuel economy

Limit the vehicle speed

Limit the power

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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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