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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-6

August 8, 2021

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20%

Page 1 of 5

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

10%

5%

15%

20%

2. The specific gravity of petrol is about

0.75

1.25

0.95

0.85

3. The power source for a brake booster is

Exhaust manifold pressure

Electricity

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

Hydraulic pump

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

175

82

65

14

5. 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

6. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Engineering scale

Screw pitch gauge

7. The ease with which petrol vaporizes is called its

Oxidation

Volatility

Octane number

Cetane number

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

1-2-4-3

1-3-4-2

1-3-2-4

1-2-3-4

9. The main function of intake manifold is that it

Reduces intake noise

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

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

Splashing action of the crankshaft

The pressure created by the oil pump

Gravity

None of these

Page 2 of 5

11. The effect of having excess camber is

Uneven tyre wear

Excessive steering alignment torque

Hard steering

Too much traction

12. The function of a governor in automobiles is to

Limit the vehicle speed

Maximise the fuel economy

Limit the power

Maintain constant engine speed

13. The specific gravity of Diesel is about

0.75

0.85

0.65

0.95

14. Which of the following oil is more viscous?

SAE 80

SAE 70

SAE 40

SAE 30

15. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

16. Engine misfiring is likely to result from

Spark plug gap too wide

Spark plug gap too small

Incorrect fuel air mixture

Vapours lock in the fuel only

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

Smaller than the positive terminal post

Larger than the positive terminal post

Of the same size as the positive terminal post

None of these

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

1.28

1.00

2.81

1.82

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

All of these

Improved fuel efficiency

Improved power output

Improved emission

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

Compensate for wear in the steering linkage

Maintain directional control

Prevent uneven tyre wear

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

Page 3 of 5

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

Ignition warning bulb

Head light bulb

Stop light bulb

Parking light bulb

22. The Diesel engine works on

Rankine cycle

Carnot cycle

Otto cycle

Diesel cycle

23. The fuel that detonates easily, is

Benzene

Alcohol

N-heptane

Iso-octane

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

Small particles

Large particles

Sharp edged fragments

None of these

25. The brake pedal during ABS operation

Is pushed upward forcefully

Pedal stroke becomes longer

All of the above

Transmits slight kickback to the driver's foot

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

Journal

Small end

Big end

Crank arm

27. 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

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

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

29. Cushioning springs in clutch plate reduces

None of these

Vehicle speed

Torsional vibrations

Jerky starts

30. The parking brake generally acts on

Front and rear wheels

Front wheels

Propeller shaft

Rear wheels

Page 4 of 5

31. Bead wires are made of

Copper

Zinc

Aluminium

Steel

32. 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

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

Belt driven by crankshaft

Chain driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

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

Overheating of the engine

Fouling of spark plug by gasoline

Incomplete valve closure

None of these

35. The commonly used antifreeze solution in automobiles is

Freon-12

Ammonium chloride

Carbon disulphide

Ethylene glycol

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

110

90

100

120

37. Odometer is an instrument used for measurement of

Power

Engine r.p.m.

Fuel consumption

Distance

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

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

Supply electric power

Continually recharges the battery

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

Tractors

Trucks

Passenger cars

Matadors

40. 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 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.

Page 5 of 5

41. The Diesel engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

None of these

Steam engines

42. 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

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

Exhaust gas volume

Air-fuel ratio

Air flow speed

Air temperature

44. Tachometer in a vehicle measures

Engine r.p.m.

Distance

Fuel consumption

Speed

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

Meshes the gears

Moves the synchronizer

Selects the synchronizer

Operates the clutch

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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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