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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

90

120

100

110

2. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

3. Which of the following oil is more viscous?

SAE 70

SAE 80

SAE 40

SAE 30

4. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Reduces intake noise

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

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

The vehicle to pull to the side of lesser inclination

Generation of a braking effect at tight corners

6. The ease with which petrol vaporizes is called its

Cetane number

Octane number

Volatility

Oxidation

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

Prevent uneven tyre wear

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

Compensate for wear in the steering linkage

Maintain directional control

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

15%

10%

5%

20%

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

Improved emission

Improved power output

All of these

Improved fuel efficiency

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

Small particles

Large particles

None of these

Sharp edged fragments

Page 2 of 5

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

2.81

1.00

1.28

1.82

12. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

None of these

Torsional vibrations

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

1-2-4-3

1-3-4-2

1-3-2-4

1-2-3-4

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

175

14

65

82

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

Supply electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

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

The pressure created by the oil pump

None of these

Splashing action of the crankshaft

Gravity

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

Small end

Big end

Journal

Crank arm

18. 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

19. 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

20. The Diesel engine works on

Rankine cycle

Carnot cycle

Otto cycle

Diesel cycle

Page 3 of 5

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

None of these

Incomplete valve closure

Fouling of spark plug by gasoline

Overheating of the engine

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

Passenger cars

Matadors

Trucks

Tractors

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

Air temperature

Exhaust gas volume

Air flow speed

Air-fuel ratio

24. The specific gravity of Diesel is about

0.75

0.65

0.95

0.85

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

Ineffectiveness of the brakes

Localized wearing of the brake pads

Judder during braking

Rapid wearing of the brake pads

26. The specific gravity of petrol is about

0.85

0.95

0.75

1.25

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

Operates the clutch

Selects the synchronizer

Meshes the gears

Moves the synchronizer

28. 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

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

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

Head light bulb

Stop light bulb

Parking light bulb

Ignition warning bulb

Page 4 of 5

31. The valve tappet clearance is measured by

Feeler gauge

Vernier caliper

Engineering scale

Screw pitch gauge

32. The effect of having excess camber is

Uneven tyre wear

Excessive steering alignment torque

Too much traction

Hard steering

33. The fuel that detonates easily, is

Benzene

Iso-octane

Alcohol

N-heptane

34. 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/2

P.L.A.N

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

Adjust the tyre pressure

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

36. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

37. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Power

Fuel consumption

38. The Diesel engines are also known as

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

None of these

39. 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

None of these

Larger than the positive terminal post

40. The parking brake generally acts on

Propeller shaft

Front and rear wheels

Rear wheels

Front wheels

Page 5 of 5

41. Bead wires are made of

Steel

Copper

Zinc

Aluminium

42. Tachometer in a vehicle measures

Distance

Engine r.p.m.

Speed

Fuel consumption

43. 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

44. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Carbon disulphide

Ammonium chloride

Freon-12

45. The brake pedal during ABS operation

Pedal stroke becomes longer

All of the above

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

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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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