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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

100

120

90

110

2. Engine misfiring is likely to result from

Spark plug gap too small

Incorrect fuel air mixture

Vapours lock in the fuel only

Spark plug gap too wide

3. 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

4. The Diesel engines are also known as

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

None of these

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

Small end

Big end

Journal

Crank arm

6. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Carbon disulphide

Freon-12

Ethylene glycol

7. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

None of these

Torsional vibrations

8. The brake pedal during ABS operation

Is pushed upward forcefully

Pedal stroke becomes longer

All of the above

Transmits slight kickback to the driver's foot

9. 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

Maintain directional control

Prevent uneven tyre wear

10. The specific gravity of petrol is about

0.95

0.85

1.25

0.75

Page 2 of 5

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

Matadors

Tractors

Passenger cars

Trucks

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

None of these

Clearance volume

Exhaust volume

Cylinder volume

13. 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

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

Improved emission

Improved power output

Improved fuel efficiency

All of these

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

1-3-2-4

1-2-3-4

1-3-4-2

1-2-4-3

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

Parking light bulb

Head light bulb

Stop light bulb

Ignition warning bulb

17. The Diesel engine works on

Rankine cycle

Otto cycle

Diesel cycle

Carnot cycle

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

2.81

1.00

1.28

1.82

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

Sharp edged fragments

None of these

Small particles

Large particles

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

65

82

14

175

Page 3 of 5

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

The differential carrier houses differential pinion gears and side gears.

The drive shafts are splined to the differential carrier.

22. Tachometer in a vehicle measures

Fuel consumption

Distance

Speed

Engine r.p.m.

23. Odometer is an instrument used for measurement of

Fuel consumption

Engine r.p.m.

Distance

Power

24. The fuel that detonates easily, is

Benzene

Iso-octane

N-heptane

Alcohol

25. 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/4

P.L.A.N/2

2 × P.L.A.N

26. The function of a governor in automobiles is to

Limit the vehicle speed

Maintain constant engine speed

Limit the power

Maximise the fuel economy

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

Larger than the positive terminal post

Of the same size as the positive terminal post

None of these

Smaller than the positive terminal post

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

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

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

The vehicle to pull to the side of lesser inclination

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

30. Bead wires are made of

Zinc

Copper

Steel

Aluminium

Page 4 of 5

31. The effect of having excess camber is

Hard steering

Uneven tyre wear

Excessive steering alignment torque

Too much traction

32. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Reduces intake noise

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

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

5%

20%

10%

15%

34. 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

35. Which of the following oil is more viscous?

SAE 30

SAE 80

SAE 70

SAE 40

36. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Extreme length of the vehicle

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

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

Air flow speed

Air-fuel ratio

Exhaust gas volume

Air temperature

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

None of these

Overheating of the engine

Fouling of spark plug by gasoline

Incomplete valve closure

39. 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

40. The specific gravity of Diesel is about

0.65

0.95

0.75

0.85

Page 5 of 5

41. The valve tappet clearance is measured by

Feeler gauge

Screw pitch gauge

Vernier caliper

Engineering scale

42. The parking brake generally acts on

Rear wheels

Front and rear wheels

Propeller shaft

Front wheels

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

Splashing action of the crankshaft

None of these

The pressure created by the oil pump

Gravity

44. The ease with which petrol vaporizes is called its

Oxidation

Octane number

Volatility

Cetane number

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

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

Rotate the tyres

Adjust the damper spring tension

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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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