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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 function of a governor in automobiles is to

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

Limit the power

2. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Ethylene glycol

Freon-12

Carbon disulphide

3. 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

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

82

175

65

14

5. The ease with which petrol vaporizes is called its

Cetane number

Octane number

Volatility

Oxidation

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

None of these

Small particles

Large particles

Sharp edged fragments

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

Head light bulb

Stop light bulb

Ignition warning bulb

Parking light bulb

8. Engine misfiring is likely to result from

Spark plug gap too small

Spark plug gap too wide

Incorrect fuel air mixture

Vapours lock in the fuel only

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

5%

20%

10%

15%

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

1.00

1.82

2.81

1.28

Page 2 of 5

11. The specific gravity of Diesel is about

0.85

0.95

0.65

0.75

12. Which of the following oil is more viscous?

SAE 40

SAE 30

SAE 70

SAE 80

13. Bead wires are made of

Copper

Zinc

Aluminium

Steel

14. The Diesel engine works on

Carnot cycle

Otto cycle

Rankine cycle

Diesel cycle

15. Odometer is an instrument used for measurement of

Engine r.p.m.

Fuel consumption

Distance

Power

16. The specific gravity of petrol is about

1.25

0.85

0.95

0.75

17. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Vehicle speed

Jerky starts

18. The power source for a brake booster is

Exhaust manifold pressure

Electricity

Hydraulic pump

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

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

Ineffectiveness of the brakes

Rapid wearing of the brake pads

Judder during braking

Localized wearing of the brake pads

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

Fouling of spark plug by gasoline

None of these

Overheating of the engine

Incomplete valve closure

Page 3 of 5

21. The effect of having excess camber is

Excessive steering alignment torque

Hard steering

Too much traction

Uneven tyre wear

22. 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

P.L.A.N/2

P.L.A.N/4

23. The valve tappet clearance is measured by

Vernier caliper

Screw pitch gauge

Feeler gauge

Engineering scale

24. The parking brake generally acts on

Rear wheels

Front wheels

Front and rear wheels

Propeller shaft

25. 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.

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.

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

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

Rotate the tyres

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

Big end

Crank arm

Small end

Journal

28. The fuel that detonates easily, is

Alcohol

Iso-octane

N-heptane

Benzene

29. The brake pedal during ABS operation

Pedal stroke becomes longer

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

All of the above

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

Compensate for wear in the steering linkage

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

Maintain directional control

Prevent uneven tyre wear

Page 4 of 5

31. The Diesel engines are also known as

None of these

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

32. 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 rear tyres

Distance between the centres of the front tyres

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

Exhaust volume

Cylinder volume

Clearance volume

None of these

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

Air-fuel ratio

Air temperature

Air flow speed

Exhaust gas volume

35. 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

36. 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

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

Belt driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Chain driven by crankshaft

38. Tachometer in a vehicle measures

Engine r.p.m.

Distance

Speed

Fuel consumption

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

All of these

Improved emission

Improved power output

Improved fuel efficiency

40. 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

Page 5 of 5

41. 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

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

Operates the clutch

Meshes the gears

Selects the synchronizer

Moves the synchronizer

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

Gravity

Splashing action of the crankshaft

None of these

The pressure created by the oil pump

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

Tractors

Matadors

Trucks

Passenger cars

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

100

90

120

110

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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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