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

Fouling of spark plug by gasoline

None of these

Incomplete valve closure

Overheating of the engine

2. The fuel that detonates easily, is

Iso-octane

N-heptane

Benzene

Alcohol

3. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

4. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Ammonium chloride

Carbon disulphide

Freon-12

5. 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

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

6. Odometer is an instrument used for measurement of

Power

Distance

Engine r.p.m.

Fuel consumption

7. The Diesel engine works on

Rankine cycle

Otto cycle

Diesel cycle

Carnot cycle

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

Tractors

Passenger cars

Trucks

Matadors

9. Cushioning springs in clutch plate reduces

Torsional vibrations

Jerky starts

None of these

Vehicle speed

10. The power source for a brake booster is

Exhaust manifold pressure

Hydraulic pump

Electricity

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

Page 2 of 5

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

14

82

65

175

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

Exhaust volume

Cylinder volume

None of these

Clearance volume

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

Head light bulb

Parking light bulb

Stop light bulb

Ignition warning bulb

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

1.00

1.82

2.81

1.28

15. Which of the following oil is more viscous?

SAE 40

SAE 80

SAE 70

SAE 30

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

17. The function of a governor in automobiles is to

Limit the power

Maintain constant engine speed

Limit the vehicle speed

Maximise the fuel economy

18. The effect of having excess camber is

Uneven tyre wear

Hard steering

Excessive steering alignment torque

Too much traction

19. 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

20. 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

Page 3 of 5

21. The parking brake generally acts on

Rear wheels

Propeller shaft

Front and rear wheels

Front wheels

22. 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

23. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Reduces intake noise

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

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

Of the same size as the positive terminal post

Larger than the positive terminal post

None of these

Smaller than the positive terminal post

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

Prevent uneven tyre wear

Maintain directional control

Compensate for wear in the steering linkage

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

26. The brake pedal during ABS operation

All of the above

Is pushed upward forcefully

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

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

100

110

120

90

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

Improved fuel efficiency

All of these

Improved power output

Improved emission

29. Bead wires are made of

Aluminium

Zinc

Steel

Copper

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)

2 × P.L.A.N

P.L.A.N/2

P.L.A.N

P.L.A.N/4

Page 4 of 5

31. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Screw pitch gauge

Engineering scale

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

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

Rotate the tyres

Adjust the tyre pressure

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

Exhaust gas volume

Air temperature

Air-fuel ratio

Air flow speed

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

Judder during braking

Localized wearing of the brake pads

Ineffectiveness of the brakes

Rapid wearing of the brake pads

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

Large particles

None of these

Small particles

Sharp edged fragments

36. The Diesel engines are also known as

Spark ignition (S.I.) engines

None of these

Steam engines

Compression ignition (C.I.) engines

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

1-2-4-3

1-3-2-4

1-2-3-4

1-3-4-2

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

10%

5%

20%

15%

39. The specific gravity of Diesel is about

0.65

0.95

0.75

0.85

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

Crank arm

Big end

Small end

Journal

Page 5 of 5

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

None of these

Gravity

The pressure created by the oil pump

Splashing action of the crankshaft

42. The ease with which petrol vaporizes is called its

Cetane number

Oxidation

Volatility

Octane number

43. The specific gravity of petrol is about

0.85

0.75

0.95

1.25

44. Tachometer in a vehicle measures

Fuel consumption

Distance

Speed

Engine r.p.m.

45. 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

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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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