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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 specific gravity of petrol is about

1.25

0.85

0.95

0.75

2. The ease with which petrol vaporizes is called its

Volatility

Cetane number

Oxidation

Octane number

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

Small end

Journal

Big end

Crank arm

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

The pressure created by the oil pump

None of these

Gravity

Splashing action of the crankshaft

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

The drive shafts are splined to the differential carrier.

6. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

Reduces intake noise

Cools the intake air to a suitable temperature

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

None of these

Small particles

Large particles

Sharp edged fragments

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

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

None of these

9. The specific gravity of Diesel is about

0.65

0.95

0.75

0.85

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

1-2-3-4

1-3-2-4

1-2-4-3

1-3-4-2

Page 2 of 5

11. The valve tappet clearance is measured by

Engineering scale

Feeler gauge

Vernier caliper

Screw pitch gauge

12. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 70

SAE 40

13. Bead wires are made of

Copper

Aluminium

Zinc

Steel

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

Continually recharges the battery

Supply electric power

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

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

All of these

Improved fuel efficiency

Improved power output

Improved emission

16. The power source for a brake booster is

Electricity

Exhaust manifold pressure

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

Hydraulic pump

17. The effect of having excess camber is

Excessive steering alignment torque

Uneven tyre wear

Hard steering

Too much traction

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

20%

15%

5%

10%

19. The brake pedal during ABS operation

Is pushed upward forcefully

All of the above

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

20. The Diesel engine works on

Otto cycle

Rankine cycle

Diesel cycle

Carnot cycle

Page 3 of 5

21. The function of a governor in automobiles is to

Limit the power

Maintain constant engine speed

Maximise the fuel economy

Limit the vehicle speed

22. 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

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

110

120

100

90

24. The Diesel engines are also known as

Compression ignition (C.I.) engines

None of these

Steam engines

Spark ignition (S.I.) engines

25. Cushioning springs in clutch plate reduces

Torsional vibrations

Vehicle speed

Jerky starts

None of these

26. 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

Localized wearing of the brake pads

Judder during braking

27. Engine misfiring is likely to result from

Incorrect fuel air mixture

Vapours lock in the fuel only

Spark plug gap too small

Spark plug gap too wide

28. Tachometer in a vehicle measures

Distance

Engine r.p.m.

Speed

Fuel consumption

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

Overheating of the engine

None of these

Incomplete valve closure

Fouling of spark plug by gasoline

30. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

Page 4 of 5

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

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

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

Ignition warning bulb

Parking light bulb

Head light bulb

Stop light bulb

33. 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

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

175

14

65

82

35. 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

36. The fuel that detonates easily, is

N-heptane

Benzene

Iso-octane

Alcohol

37. 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

P.L.A.N/4

2 × P.L.A.N

38. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ethylene glycol

Freon-12

Ammonium chloride

39. 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

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

Matadors

Passenger cars

Trucks

Tractors

Page 5 of 5

41. Odometer is an instrument used for measurement of

Fuel consumption

Power

Engine r.p.m.

Distance

42. The parking brake generally acts on

Front and rear wheels

Propeller shaft

Front wheels

Rear wheels

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

None of these

Clearance volume

Cylinder volume

Exhaust volume

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

2.81

1.28

1.00

1.82

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

Operates the clutch

Meshes the gears

Moves the synchronizer

Selects the synchronizer

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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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