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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 octane number of compressed natural gas (CNG) is

120

110

100

90

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

Judder during braking

Localized wearing of the brake pads

Rapid wearing of the brake pads

Ineffectiveness of the brakes

3. Bead wires are made of

Copper

Steel

Zinc

Aluminium

4. The ease with which petrol vaporizes is called its

Octane number

Cetane number

Oxidation

Volatility

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

1-3-4-2

1-3-2-4

1-2-4-3

1-2-3-4

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

Smaller than the positive terminal post

None of these

Larger than the positive terminal post

Of the same size as the positive terminal post

7. The Diesel engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

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

175

82

65

14

9. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

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

Passenger cars

Tractors

Trucks

Matadors

Page 2 of 5

11. The valve tappet clearance is measured by

Screw pitch gauge

Engineering scale

Feeler gauge

Vernier caliper

12. The commonly used antifreeze solution in automobiles is

Freon-12

Carbon disulphide

Ethylene glycol

Ammonium chloride

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

Clearance volume

None of these

Cylinder volume

Exhaust volume

14. Which of the following oil is more viscous?

SAE 80

SAE 70

SAE 30

SAE 40

15. The specific gravity of Diesel is about

0.95

0.75

0.85

0.65

16. 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

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

Generation of a braking effect at tight corners

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

18. 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/4

2 × P.L.A.N

P.L.A.N

P.L.A.N/2

19. 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

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

Large particles

None of these

Sharp edged fragments

Small particles

Page 3 of 5

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

Improved power output

Improved emission

All of these

Improved fuel efficiency

22. The power source for a brake booster is

Hydraulic pump

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

Electricity

Exhaust manifold pressure

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

Air flow speed

Exhaust gas volume

Air temperature

Air-fuel ratio

24. The parking brake generally acts on

Front and rear wheels

Propeller shaft

Rear wheels

Front wheels

25. The specific gravity of petrol is about

0.85

0.95

1.25

0.75

26. The brake pedal during ABS operation

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

All of the above

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

Converts mechanical energy into electrical energy

Supply electric power

Continually recharges the battery

Partly converts engine power into electric power

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

Stop light bulb

Head light bulb

Parking light bulb

Ignition warning bulb

29. Tachometer in a vehicle measures

Distance

Engine r.p.m.

Speed

Fuel consumption

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

Small end

Journal

Big end

Crank arm

Page 4 of 5

31. The effect of having excess camber is

Too much traction

Excessive steering alignment torque

Uneven tyre wear

Hard steering

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

1.82

1.28

2.81

1.00

33. 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

34. The function of a governor in automobiles is to

Maximise the fuel economy

Maintain constant engine speed

Limit the vehicle speed

Limit the power

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

5%

15%

10%

20%

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

None of these

Incomplete valve closure

Overheating of the engine

Fouling of spark plug by gasoline

37. Odometer is an instrument used for measurement of

Power

Distance

Fuel consumption

Engine r.p.m.

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

Compensate for wear in the steering linkage

Prevent uneven tyre wear

Maintain directional control

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

39. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Reduces intake noise

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

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

Meshes the gears

Selects the synchronizer

Moves the synchronizer

Operates the clutch

Page 5 of 5

41. The fuel that detonates easily, is

Alcohol

Benzene

N-heptane

Iso-octane

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

The drive shafts are splined to the differential carrier.

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

Belt driven by crankshaft

Belt driven by camshaft

Chain driven by crankshaft

Belt driven by drive-shaft

44. Cushioning springs in clutch plate reduces

Vehicle speed

Jerky starts

None of these

Torsional vibrations

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

Splashing action of the crankshaft

Gravity

The pressure created by the oil pump

None of these

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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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