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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

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

Prevent uneven tyre wear

Compensate for wear in the steering linkage

Maintain directional control

2. The power source for a brake booster is

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

Electricity

Hydraulic pump

Exhaust manifold pressure

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

5%

10%

20%

15%

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

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

Tendency to assume toe-out orientation

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

175

82

14

65

6. The specific gravity of Diesel is about

0.85

0.95

0.65

0.75

7. 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

8. Which of the following oil is more viscous?

SAE 70

SAE 80

SAE 30

SAE 40

9. Cushioning springs in clutch plate reduces

None of these

Vehicle speed

Torsional vibrations

Jerky starts

10. The ease with which petrol vaporizes is called its

Volatility

Cetane number

Octane number

Oxidation

Page 2 of 5

11. The specific gravity of petrol is about

0.75

0.85

0.95

1.25

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

Ignition warning bulb

Head light bulb

Parking light bulb

Stop light bulb

13. The parking brake generally acts on

Propeller shaft

Front and rear wheels

Front wheels

Rear wheels

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

Larger than the positive terminal post

Of the same size as the positive terminal post

None of these

Smaller than the positive terminal post

15. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Reduces intake noise

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

16. The function of a governor in automobiles is to

Limit the vehicle speed

Limit the power

Maintain constant engine speed

Maximise the fuel economy

17. Engine misfiring is likely to result from

Incorrect fuel air mixture

Vapours lock in the fuel only

Spark plug gap too wide

Spark plug gap too small

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

Incomplete valve closure

Fouling of spark plug by gasoline

None of these

Overheating of the engine

19. 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/2

2 × P.L.A.N

P.L.A.N/4

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

Clearance volume

Cylinder volume

Exhaust volume

None of these

Page 3 of 5

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

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the damper spring tension

22. The Diesel engine works on

Carnot cycle

Rankine cycle

Otto cycle

Diesel cycle

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

Small particles

Large particles

None of these

Sharp edged fragments

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

Belt driven by crankshaft

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by camshaft

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

Improved power output

All of these

Improved fuel efficiency

Improved emission

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

Selects the synchronizer

Meshes the gears

Moves the synchronizer

Operates the clutch

27. 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.

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

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

Supply electric power

29. Odometer is an instrument used for measurement of

Engine r.p.m.

Fuel consumption

Distance

Power

30. 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

Page 4 of 5

31. Tachometer in a vehicle measures

Speed

Engine r.p.m.

Fuel consumption

Distance

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

None of these

The pressure created by the oil pump

Splashing action of the crankshaft

Gravity

33. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Carbon disulphide

Freon-12

Ammonium chloride

34. The Diesel engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

None of these

Steam engines

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

100

90

120

110

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

Crank arm

Journal

Small end

Big end

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

1.00

1.28

2.81

1.82

38. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

Distance between the centres of the front tyres

39. The brake pedal during ABS operation

All of the above

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

Is pushed upward forcefully

40. The fuel that detonates easily, is

Iso-octane

Benzene

N-heptane

Alcohol

Page 5 of 5

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

Matadors

Tractors

Passenger cars

Trucks

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

1-2-4-3

1-3-2-4

1-3-4-2

1-2-3-4

43. The valve tappet clearance is measured by

Feeler gauge

Engineering scale

Vernier caliper

Screw pitch gauge

44. The effect of having excess camber is

Too much traction

Uneven tyre wear

Excessive steering alignment torque

Hard steering

45. Bead wires are made of

Zinc

Aluminium

Steel

Copper

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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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