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

1-2-4-3

1-2-3-4

1-3-4-2

1-3-2-4

2. Bead wires are made of

Zinc

Copper

Steel

Aluminium

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

65

14

175

82

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

Splashing action of the crankshaft

None of these

Gravity

The pressure created by the oil pump

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

110

100

90

120

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

Incomplete valve closure

Fouling of spark plug by gasoline

None of these

Overheating of the engine

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

Small end

Big end

Crank arm

Journal

8. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too wide

Vapours lock in the fuel only

Spark plug gap too small

9. The specific gravity of petrol is about

0.85

0.75

0.95

1.25

10. The fuel that detonates easily, is

Iso-octane

Benzene

Alcohol

N-heptane

Page 2 of 5

11. The function of a governor in automobiles is to

Limit the vehicle speed

Maximise the fuel economy

Limit the power

Maintain constant engine speed

12. The parking brake generally acts on

Rear wheels

Front and rear wheels

Front wheels

Propeller shaft

13. 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.

14. 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

P.L.A.N/4

2 × P.L.A.N

15. 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

16. 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

Electricity

Hydraulic pump

17. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 70

SAE 40

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

Meshes the gears

Operates the clutch

Selects the synchronizer

Moves the synchronizer

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

Supply electric power

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

20. Tachometer in a vehicle measures

Speed

Engine r.p.m.

Distance

Fuel consumption

Page 3 of 5

21. The Diesel engine works on

Carnot cycle

Rankine cycle

Otto cycle

Diesel cycle

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

Air flow speed

Exhaust gas volume

Air-fuel ratio

Air temperature

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

Clearance volume

Cylinder volume

None of these

Exhaust volume

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

20%

10%

5%

15%

25. 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

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

Compensate for wear in the steering linkage

Maintain directional control

Prevent uneven tyre wear

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

27. Wheel base of a vehicle is the

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

28. The specific gravity of Diesel is about

0.85

0.75

0.65

0.95

29. The ease with which petrol vaporizes is called its

Octane number

Volatility

Cetane number

Oxidation

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

1.00

1.28

2.81

1.82

Page 4 of 5

31. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Reduces intake noise

Promotes the mixture of air and fuel

32. The valve tappet clearance is measured by

Feeler gauge

Screw pitch gauge

Engineering scale

Vernier caliper

33. The brake pedal during ABS operation

Transmits slight kickback to the driver's foot

All of the above

Is pushed upward forcefully

Pedal stroke becomes longer

34. Cushioning springs in clutch plate reduces

None of these

Jerky starts

Vehicle speed

Torsional vibrations

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

None of these

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

36. The commonly used antifreeze solution in automobiles is

Freon-12

Carbon disulphide

Ammonium chloride

Ethylene glycol

37. 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 drive-shaft

Belt driven by crankshaft

38. The effect of having excess camber is

Uneven tyre wear

Too much traction

Hard steering

Excessive steering alignment torque

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

The vehicle to pull to the side of lesser inclination

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

40. The Diesel engines are also known as

Spark ignition (S.I.) engines

Steam engines

None of these

Compression ignition (C.I.) engines

Page 5 of 5

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

Passenger cars

Matadors

Tractors

Trucks

42. Odometer is an instrument used for measurement of

Fuel consumption

Distance

Power

Engine r.p.m.

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

Sharp edged fragments

Small particles

Large particles

None of these

44. 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

Rapid wearing of the brake pads

Judder during braking

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

Improved fuel efficiency

Improved emission

All of these

Improved power output

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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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