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

Air temperature

Exhaust gas volume

Air-fuel ratio

Air flow speed

2. Bead wires are made of

Zinc

Steel

Aluminium

Copper

3. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

4. 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

5. The parking brake generally acts on

Rear wheels

Front and rear wheels

Front wheels

Propeller shaft

6. 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

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

1-2-3-4

1-2-4-3

1-3-4-2

1-3-2-4

8. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Fuel consumption

Power

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

1.00

1.82

2.81

1.28

10. The fuel that detonates easily, is

Benzene

Iso-octane

N-heptane

Alcohol

Page 2 of 5

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

Rotate the tyres

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

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

110

90

100

120

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

82

14

175

65

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

Trucks

Tractors

Matadors

Passenger cars

15. Cushioning springs in clutch plate reduces

Vehicle speed

Torsional vibrations

None of these

Jerky starts

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

Exhaust volume

Clearance volume

Cylinder volume

None of these

17. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Freon-12

Ethylene glycol

Ammonium chloride

18. The specific gravity of Diesel is about

0.65

0.85

0.75

0.95

19. 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

20. Tachometer in a vehicle measures

Speed

Distance

Fuel consumption

Engine r.p.m.

Page 3 of 5

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

Improved fuel efficiency

Improved power output

All of these

Improved emission

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

Large particles

Sharp edged fragments

Small particles

None of these

23. The Diesel engine works on

Otto cycle

Rankine cycle

Diesel cycle

Carnot cycle

24. The Diesel engines are also known as

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

Steam engines

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

Small end

Journal

Crank arm

Big end

26. The brake pedal during ABS operation

All of the above

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

27. The effect of having excess camber is

Uneven tyre wear

Hard steering

Too much traction

Excessive steering alignment torque

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

Moves the synchronizer

Meshes the gears

Selects the synchronizer

Operates the clutch

29. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

Reduces intake noise

Distributes intake air equally to the cylinders

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

Incomplete valve closure

Overheating of the engine

Fouling of spark plug by gasoline

None of these

Page 4 of 5

31. 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 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 differential carrier houses differential pinion gears and side gears.

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

Splashing action of the crankshaft

Gravity

The pressure created by the oil pump

None of these

33. The specific gravity of petrol is about

0.75

0.95

0.85

1.25

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

Converts mechanical energy into electrical energy

Continually recharges the battery

Partly converts engine power into electric power

Supply electric power

35. 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

36. 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

P.L.A.N/4

37. The valve tappet clearance is measured by

Screw pitch gauge

Feeler gauge

Engineering scale

Vernier caliper

38. Engine misfiring is likely to result from

Vapours lock in the fuel only

Incorrect fuel air mixture

Spark plug gap too wide

Spark plug gap too small

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

Larger than the positive terminal post

Smaller than the positive terminal post

None of these

Of the same size as the positive terminal post

40. 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

Page 5 of 5

41. The ease with which petrol vaporizes is called its

Cetane number

Oxidation

Octane number

Volatility

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

15%

5%

20%

10%

43. 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

44. Which of the following oil is more viscous?

SAE 80

SAE 40

SAE 70

SAE 30

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

Head light bulb

Ignition warning bulb

Stop light bulb

Parking light bulb

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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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