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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 specific gravity of petrol is about

1.25

0.85

0.75

0.95

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

1-2-3-4

1-2-4-3

1-3-4-2

1-3-2-4

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

Ineffectiveness of the brakes

Judder during braking

Localized wearing of the brake pads

Rapid wearing of the brake pads

4. Tachometer in a vehicle measures

Engine r.p.m.

Fuel consumption

Speed

Distance

5. The effect of having excess camber is

Hard steering

Uneven tyre wear

Excessive steering alignment torque

Too much traction

6. 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/4

P.L.A.N/2

P.L.A.N

7. Which of the following oil is more viscous?

SAE 70

SAE 40

SAE 80

SAE 30

8. The valve tappet clearance is measured by

Screw pitch gauge

Engineering scale

Feeler gauge

Vernier caliper

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

The pressure created by the oil pump

Gravity

None of these

Splashing action of the crankshaft

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

Improved fuel efficiency

Improved power output

All of these

Improved emission

Page 2 of 5

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

Tendency to assume toe-out orientation

The vehicle to pull to the side of lesser inclination

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

12. The specific gravity of Diesel is about

0.85

0.95

0.65

0.75

13. 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

Larger than the positive terminal post

None of these

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

Exhaust volume

Clearance volume

Cylinder volume

None of these

15. The parking brake generally acts on

Propeller shaft

Rear wheels

Front wheels

Front and rear wheels

16. Odometer is an instrument used for measurement of

Fuel consumption

Power

Engine r.p.m.

Distance

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

Tractors

Passenger cars

Matadors

Trucks

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

Journal

Crank arm

Big end

Small end

19. The ease with which petrol vaporizes is called its

Oxidation

Volatility

Cetane number

Octane number

20. 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

Page 3 of 5

21. The Diesel engine works on

Rankine cycle

Diesel cycle

Carnot cycle

Otto cycle

22. 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

23. Bead wires are made of

Steel

Zinc

Copper

Aluminium

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

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

Supply electric power

25. Cushioning springs in clutch plate reduces

Vehicle speed

Torsional vibrations

Jerky starts

None of these

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

Stop light bulb

Ignition warning bulb

Parking light bulb

Head light bulb

27. The main function of intake manifold is that it

Reduces intake noise

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

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

120

100

90

110

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

Moves the synchronizer

Meshes the gears

Selects the synchronizer

Operates the clutch

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

1.28

2.81

1.00

1.82

Page 4 of 5

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

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

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 differential carrier houses differential pinion gears and side gears.

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

Adjust the tyre pressure

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

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

Sharp edged fragments

None of these

Small particles

Large particles

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

5%

15%

20%

10%

35. 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

36. 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

37. The function of a governor in automobiles is to

Limit the power

Maintain constant engine speed

Limit the vehicle speed

Maximise the fuel economy

38. The Diesel engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

Steam engines

None of these

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

175

82

14

65

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

Fouling of spark plug by gasoline

Incomplete valve closure

None of these

Overheating of the engine

Page 5 of 5

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

Belt driven by crankshaft

Chain driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

42. The power source for a brake booster is

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

Exhaust manifold pressure

Hydraulic pump

Electricity

43. The commonly used antifreeze solution in automobiles is

Freon-12

Ethylene glycol

Ammonium chloride

Carbon disulphide

44. The fuel that detonates easily, is

Benzene

N-heptane

Iso-octane

Alcohol

45. 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 front and rear wheels

Distance between the centres of the rear tyres

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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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