Automobile Engineering Practice Set-6

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1. Cushioning springs in clutch plate reduces

Torsional vibrations

Jerky starts

None of these

Vehicle speed

2. The Diesel engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

Steam engines

None of these

3. Odometer is an instrument used for measurement of

Engine r.p.m.

Power

Fuel consumption

Distance

4. The effect of having excess camber is

Too much traction

Hard steering

Uneven tyre wear

Excessive steering alignment torque

5. 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

6. Tachometer in a vehicle measures

Engine r.p.m.

Distance

Fuel consumption

Speed

7. The parking brake generally acts on

Rear wheels

Propeller shaft

Front and rear wheels

Front wheels

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

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Localized wearing of the brake pads

Judder during braking

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

Passenger cars

Matadors

Trucks

Tractors

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

Moves the synchronizer

Selects the synchronizer

Operates the clutch

Meshes the gears

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

Improved emission

All of these

Improved fuel efficiency

Improved power output

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

Rotate the tyres

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

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

Of the same size as the positive terminal post

Larger than the positive terminal post

None of these

Smaller than the positive terminal post

14. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 40

SAE 70

15. Engine misfiring is likely to result from

Vapours lock in the fuel only

Incorrect fuel air mixture

Spark plug gap too small

Spark plug gap too wide

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

20%

10%

15%

5%

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

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

The drive shafts are splined to the differential carrier.

18. The specific gravity of Diesel is about

0.65

0.95

0.85

0.75

19. 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

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

Small particles

Sharp edged fragments

Large particles

None of these

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21. Bead wires are made of

Copper

Aluminium

Zinc

Steel

22. 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

23. The specific gravity of petrol is about

0.75

1.25

0.95

0.85

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

Big end

Small end

Journal

Crank arm

25. 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

26. The power source for a brake booster is

Electricity

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

Exhaust manifold pressure

Hydraulic pump

27. The Diesel engine works on

Diesel cycle

Carnot cycle

Rankine cycle

Otto cycle

28. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ammonium chloride

Ethylene glycol

Freon-12

29. 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

P.L.A.N/2

P.L.A.N

2 × P.L.A.N

30. 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

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

100

90

120

110

32. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Engineering scale

Screw pitch gauge

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

14

82

65

175

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

1.82

2.81

1.28

1.00

35. 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 and rear wheels

Distance between the centres of the front tyres

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

1-3-4-2

1-2-3-4

1-3-2-4

1-2-4-3

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

Exhaust volume

Cylinder volume

Clearance volume

None of these

38. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

Reduces intake noise

Promotes the mixture of air and fuel

39. 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

Prevent uneven tyre wear

Maintain directional control

40. The function of a governor in automobiles is to

Limit the power

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

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41. The ease with which petrol vaporizes is called its

Cetane number

Volatility

Octane number

Oxidation

42. The fuel that detonates easily, is

N-heptane

Iso-octane

Alcohol

Benzene

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

Incomplete valve closure

None of these

Overheating of the engine

Fouling of spark plug by gasoline

44. The brake pedal during ABS operation

All of the above

Transmits slight kickback to the driver's foot

Is pushed upward forcefully

Pedal stroke becomes longer

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

Partly converts engine power into electric power

Continually recharges the battery

Supply electric power

Converts mechanical energy into electrical energy

Automobile Engineering Practice Set-6

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Automobile Engineering Practice Set-6

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