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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

0.95

0.85

0.75

1.25

2. Odometer is an instrument used for measurement of

Power

Engine r.p.m.

Distance

Fuel consumption

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

Smaller than the positive terminal post

Of the same size as the positive terminal post

Larger than the positive terminal post

None of these

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

Rotate the tyres

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

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

1-3-4-2

1-2-4-3

1-2-3-4

1-3-2-4

6. The power source for a brake booster is

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

Exhaust manifold pressure

Electricity

Hydraulic pump

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

The drive shafts are splined to the differential carrier.

The left side gear and the differential carrier rotate in constant unison.

8. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

Distance between the centres of the front tyres

9. The specific gravity of Diesel is about

0.85

0.75

0.65

0.95

10. Tachometer in a vehicle measures

Engine r.p.m.

Speed

Fuel consumption

Distance

Page 2 of 5

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

100

90

120

110

12. The effect of having excess camber is

Too much traction

Uneven tyre wear

Excessive steering alignment torque

Hard steering

13. The Diesel engine works on

Otto cycle

Rankine cycle

Diesel cycle

Carnot cycle

14. 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

15. The function of a governor in automobiles is to

Maintain constant engine speed

Limit the power

Limit the vehicle speed

Maximise the fuel economy

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

Sharp edged fragments

None of these

Large particles

Small particles

17. 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

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

Maintain directional control

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

Compensate for wear in the steering linkage

Prevent uneven tyre wear

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

15%

20%

10%

5%

20. Engine misfiring is likely to result from

Spark plug gap too wide

Vapours lock in the fuel only

Incorrect fuel air mixture

Spark plug gap too small

Page 3 of 5

21. Cushioning springs in clutch plate reduces

Vehicle speed

Jerky starts

Torsional vibrations

None of these

22. The parking brake generally acts on

Propeller shaft

Front and rear wheels

Front wheels

Rear wheels

23. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Freon-12

Ammonium chloride

Ethylene glycol

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

Tendency to assume toe-out orientation

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

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

Big end

Crank arm

Journal

Small end

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

Air-fuel ratio

Exhaust gas volume

Air flow speed

Air temperature

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

Tractors

Passenger cars

Matadors

Trucks

28. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 40

SAE 70

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

Chain driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Belt driven by crankshaft

30. The ease with which petrol vaporizes is called its

Cetane number

Volatility

Octane number

Oxidation

Page 4 of 5

31. 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

32. The fuel that detonates easily, is

N-heptane

Benzene

Iso-octane

Alcohol

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

Judder during braking

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Localized wearing of the brake pads

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

1.82

1.28

1.00

2.81

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

82

175

65

14

36. 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

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

All of these

Improved fuel efficiency

Improved power output

Improved emission

38. Bead wires are made of

Aluminium

Copper

Zinc

Steel

39. The Diesel engines are also known as

Steam engines

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

40. 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/4

P.L.A.N

2 × P.L.A.N

Page 5 of 5

41. 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

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

Overheating of the engine

Incomplete valve closure

None of these

Fouling of spark plug by gasoline

43. The valve tappet clearance is measured by

Screw pitch gauge

Vernier caliper

Feeler gauge

Engineering scale

44. 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

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

None of these

Cylinder volume

Clearance volume

Exhaust volume

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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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