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

Sharp edged fragments

Large particles

None of these

Small particles

2. Cushioning springs in clutch plate reduces

Vehicle speed

None of these

Jerky starts

Torsional vibrations

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

Incomplete valve closure

None of these

Fouling of spark plug by gasoline

Overheating of the engine

4. 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

5. The Diesel engine works on

Diesel cycle

Rankine cycle

Otto cycle

Carnot cycle

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

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

Generation of a braking effect at tight corners

7. Engine misfiring is likely to result from

Spark plug gap too small

Spark plug gap too wide

Incorrect fuel air mixture

Vapours lock in the fuel only

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

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

Prevent uneven tyre wear

Maintain directional control

Compensate for wear in the steering linkage

9. The specific gravity of petrol is about

1.25

0.85

0.75

0.95

10. The brake pedal during ABS operation

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

All of the above

Is pushed upward forcefully

Page 2 of 5

11. The fuel that detonates easily, is

Alcohol

Iso-octane

N-heptane

Benzene

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

65

14

82

175

13. Bead wires are made of

Zinc

Copper

Aluminium

Steel

14. 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

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

Rotate the tyres

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

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

2.81

1.82

1.00

1.28

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

Improved emission

Improved power output

All of these

Improved fuel efficiency

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

Stop light bulb

Head light bulb

Ignition warning bulb

Parking light bulb

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

10%

15%

5%

20%

20. The commonly used antifreeze solution in automobiles is

Freon-12

Carbon disulphide

Ammonium chloride

Ethylene glycol

Page 3 of 5

21. The ease with which petrol vaporizes is called its

Oxidation

Cetane number

Volatility

Octane number

22. The effect of having excess camber is

Excessive steering alignment torque

Too much traction

Hard steering

Uneven tyre wear

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

Passenger cars

Trucks

Tractors

Matadors

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

Belt driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Chain driven by crankshaft

25. The function of a governor in automobiles is to

Limit the vehicle speed

Maximise the fuel economy

Maintain constant engine speed

Limit the power

26. 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

27. 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 tyres

Distance between the centres of the front and rear wheels

28. 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

29. Tachometer in a vehicle measures

Distance

Speed

Engine r.p.m.

Fuel consumption

30. Odometer is an instrument used for measurement of

Distance

Fuel consumption

Power

Engine r.p.m.

Page 4 of 5

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

Smaller than the positive terminal post

None of these

Of the same size as the positive terminal post

Larger than the positive terminal post

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

Selects the synchronizer

Moves the synchronizer

Meshes the gears

Operates the clutch

33. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

34. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 40

SAE 70

35. The power source for a brake booster is

Exhaust manifold pressure

Electricity

Hydraulic pump

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

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

The pressure created by the oil pump

Splashing action of the crankshaft

None of these

Gravity

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

None of these

Cylinder volume

Exhaust volume

Clearance volume

38. The parking brake generally acts on

Front and rear wheels

Propeller shaft

Front wheels

Rear wheels

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

Crank arm

Journal

Big end

Small end

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

Localized wearing of the brake pads

Ineffectiveness of the brakes

Rapid wearing of the brake pads

Judder during braking

Page 5 of 5

41. 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

2 × P.L.A.N

P.L.A.N/4

42. The specific gravity of Diesel is about

0.95

0.75

0.85

0.65

43. 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.

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 drive shafts are splined to the differential carrier.

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

110

120

90

100

45. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Screw pitch gauge

Engineering scale

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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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