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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 ease with which petrol vaporizes is called its

Oxidation

Cetane number

Octane number

Volatility

2. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Distance between the centres of the rear tyres

Extreme length of the vehicle

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

Exhaust gas volume

Air temperature

Air-fuel ratio

Air flow speed

4. The specific gravity of Diesel is about

0.95

0.65

0.85

0.75

5. The brake pedal during ABS operation

Pedal stroke becomes longer

All of the above

Transmits slight kickback to the driver's foot

Is pushed upward forcefully

6. The function of a governor in automobiles is to

Limit the power

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

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

Moves the synchronizer

Selects the synchronizer

Operates the clutch

Meshes the gears

8. The specific gravity of petrol is about

1.25

0.95

0.85

0.75

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

Judder during braking

Localized wearing of the brake pads

Ineffectiveness of the brakes

Rapid wearing of the brake pads

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

Cylinder volume

Clearance volume

None of these

Exhaust volume

Page 2 of 5

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

14

82

175

65

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

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the tyre pressure

Adjust the damper spring tension

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

Crank arm

Big end

Journal

Small end

14. The valve tappet clearance is measured by

Engineering scale

Vernier caliper

Screw pitch gauge

Feeler gauge

15. Bead wires are made of

Copper

Steel

Aluminium

Zinc

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

1.28

1.00

1.82

2.81

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

Belt driven by camshaft

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by drive-shaft

18. Which of the following oil is more viscous?

SAE 80

SAE 70

SAE 40

SAE 30

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

1-3-4-2

1-2-3-4

1-3-2-4

1-2-4-3

20. Cushioning springs in clutch plate reduces

Vehicle speed

Jerky starts

Torsional vibrations

None of these

Page 3 of 5

21. The Diesel engine works on

Rankine cycle

Carnot cycle

Otto cycle

Diesel cycle

22. Odometer is an instrument used for measurement of

Fuel consumption

Power

Engine r.p.m.

Distance

23. The fuel that detonates easily, is

N-heptane

Iso-octane

Alcohol

Benzene

24. The effect of having excess camber is

Hard steering

Excessive steering alignment torque

Too much traction

Uneven tyre wear

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

Stop light bulb

Parking light bulb

Ignition warning bulb

Head light bulb

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

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

Compensate for wear in the steering linkage

Prevent uneven tyre wear

Maintain directional control

27. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

Reduces intake noise

Promotes the mixture of air and fuel

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

Tractors

Passenger cars

Trucks

Matadors

29. The Diesel engines are also known as

Compression ignition (C.I.) engines

None of these

Steam engines

Spark ignition (S.I.) engines

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

Of the same size as the positive terminal post

None of these

Smaller than the positive terminal post

Larger than the positive terminal post

Page 4 of 5

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

Improved fuel efficiency

Improved emission

Improved power output

All of these

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

15%

5%

10%

20%

33. Which one of the following statement correctly describes the construction of a bevel gear type differential?

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.

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

The differential carrier houses differential pinion gears and side gears.

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

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

The vehicle to pull to the side of lesser inclination

Poor recovery of the steering wheel after making a turn

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

100

110

90

120

36. The parking brake generally acts on

Propeller shaft

Rear wheels

Front and rear wheels

Front wheels

37. 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

38. Tachometer in a vehicle measures

Engine r.p.m.

Speed

Fuel consumption

Distance

39. The power source for a brake booster is

Hydraulic pump

Electricity

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

Exhaust manifold pressure

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

Gravity

Splashing action of the crankshaft

The pressure created by the oil pump

None of these

Page 5 of 5

41. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Carbon disulphide

Freon-12

Ammonium chloride

42. 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)

2 × P.L.A.N

P.L.A.N

P.L.A.N/2

P.L.A.N/4

43. 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

44. Engine misfiring is likely to result from

Spark plug gap too wide

Incorrect fuel air mixture

Spark plug gap too small

Vapours lock in the fuel only

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

None of these

Small particles

Sharp edged fragments

Large particles

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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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