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

Meshes the gears

Operates the clutch

Selects the synchronizer

Moves the synchronizer

2. Tachometer in a vehicle measures

Distance

Fuel consumption

Engine r.p.m.

Speed

3. Wheel base of a vehicle is the

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

4. The power source for a brake booster is

Electricity

Exhaust manifold pressure

Hydraulic pump

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

5. The ease with which petrol vaporizes is called its

Octane number

Volatility

Oxidation

Cetane number

6. The specific gravity of Diesel is about

0.85

0.95

0.65

0.75

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

110

90

100

120

8. Which of the following oil is more viscous?

SAE 30

SAE 80

SAE 40

SAE 70

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

Air flow speed

Air temperature

Air-fuel ratio

Exhaust gas volume

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

Improved fuel efficiency

Improved power output

All of these

Improved emission

Page 2 of 5

11. The parking brake generally acts on

Rear wheels

Front wheels

Front and rear wheels

Propeller shaft

12. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Freon-12

Ethylene glycol

Ammonium chloride

13. The fuel that detonates easily, is

Benzene

Iso-octane

N-heptane

Alcohol

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. 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

16. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

None of these

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

Stop light bulb

Ignition warning bulb

Head light bulb

Parking light bulb

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

1.28

2.81

1.00

1.82

19. The Diesel engine works on

Rankine cycle

Otto cycle

Diesel cycle

Carnot cycle

20. Bead wires are made of

Aluminium

Zinc

Steel

Copper

Page 3 of 5

21. 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

22. The valve tappet clearance is measured by

Engineering scale

Screw pitch gauge

Vernier caliper

Feeler gauge

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

Partly converts engine power into electric power

Supply electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

24. Cushioning springs in clutch plate reduces

Vehicle speed

Jerky starts

Torsional vibrations

None of these

25. The effect of having excess camber is

Excessive steering alignment torque

Uneven tyre wear

Hard steering

Too much traction

26. 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

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

The vehicle to pull to the side of lesser inclination

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

28. 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.

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.

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

20%

15%

5%

10%

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

None of these

Sharp edged fragments

Small particles

Large particles

Page 4 of 5

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

82

14

175

65

32. The specific gravity of petrol is about

0.75

0.95

0.85

1.25

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

Judder during braking

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

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

None of these

Splashing action of the crankshaft

The pressure created by the oil pump

Gravity

35. The function of a governor in automobiles is to

Limit the vehicle speed

Maintain constant engine speed

Limit the power

Maximise the fuel economy

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

None of these

Exhaust volume

Clearance volume

Cylinder volume

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

Matadors

Trucks

Passenger cars

Tractors

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

Small end

Journal

Crank arm

Big end

39. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Fuel consumption

Power

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

Belt driven by drive-shaft

Belt driven by crankshaft

Chain driven by crankshaft

Belt driven by camshaft

Page 5 of 5

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

Of the same size as the positive terminal post

None of these

Larger than the positive terminal post

Smaller than the positive terminal post

42. 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)

2 × P.L.A.N

P.L.A.N/4

P.L.A.N/2

P.L.A.N

43. Engine misfiring is likely to result from

Vapours lock in the fuel only

Spark plug gap too wide

Spark plug gap too small

Incorrect fuel air mixture

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

Fouling of spark plug by gasoline

Incomplete valve closure

Overheating of the engine

None of these

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

Rotate the tyres

Adjust the tyre pressure

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

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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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