Automobile Engineering Practice Set-6

Page 1 of 5

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

Rotate the tyres

Adjust the tyre pressure

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

2. 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

3. The valve tappet clearance is measured by

Feeler gauge

Screw pitch gauge

Engineering scale

Vernier caliper

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

Passenger cars

Trucks

Tractors

Matadors

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

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

Rapid wearing of the brake pads

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

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

Tendency to assume toe-out orientation

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

Prevent uneven tyre wear

Maintain directional control

Compensate for wear in the steering linkage

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

8. 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 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.

9. Tachometer in a vehicle measures

Engine r.p.m.

Speed

Fuel consumption

Distance

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

Ignition warning bulb

Parking light bulb

Stop light bulb

Head light bulb

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11. Bead wires are made of

Copper

Aluminium

Steel

Zinc

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

Splashing action of the crankshaft

The pressure created by the oil pump

Gravity

None of these

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

1-3-4-2

1-2-4-3

1-2-3-4

1-3-2-4

14. 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

15. The Diesel engine works on

Diesel cycle

Rankine cycle

Carnot cycle

Otto cycle

16. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Jerky starts

Vehicle speed

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

Of the same size as the positive terminal post

None of these

Smaller than the positive terminal post

Larger than the positive terminal post

18. Engine misfiring is likely to result from

Vapours lock in the fuel only

Spark plug gap too small

Spark plug gap too wide

Incorrect fuel air mixture

19. 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

20. Odometer is an instrument used for measurement of

Engine r.p.m.

Fuel consumption

Distance

Power

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21. The parking brake generally acts on

Rear wheels

Propeller shaft

Front and rear wheels

Front wheels

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

120

110

90

100

23. 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 camshaft

Belt driven by drive-shaft

24. The function of a governor in automobiles is to

Maintain constant engine speed

Limit the vehicle speed

Maximise the fuel economy

Limit the power

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

1.82

2.81

1.00

1.28

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

14

82

175

65

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

Supply electric power

Partly converts engine power into electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

28. The ease with which petrol vaporizes is called its

Volatility

Oxidation

Octane number

Cetane number

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

Improved power output

Improved emission

All of these

Improved fuel efficiency

30. 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

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

Sharp edged fragments

Small particles

Large particles

None of these

32. The fuel that detonates easily, is

Alcohol

Iso-octane

N-heptane

Benzene

33. 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

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

Meshes the gears

Operates the clutch

Moves the synchronizer

Selects the synchronizer

35. The specific gravity of petrol is about

0.85

0.75

0.95

1.25

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

Cylinder volume

None of these

Clearance volume

Exhaust volume

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

15%

10%

20%

5%

38. The effect of having excess camber is

Hard steering

Too much traction

Uneven tyre wear

Excessive steering alignment torque

39. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Freon-12

Ammonium chloride

Ethylene glycol

40. The Diesel engines are also known as

Steam engines

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

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41. The specific gravity of Diesel is about

0.75

0.95

0.65

0.85

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

Journal

Small end

Crank arm

Big end

43. Which of the following oil is more viscous?

SAE 80

SAE 70

SAE 30

SAE 40

44. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Reduces intake noise

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

45. The power source for a brake booster is

Exhaust manifold pressure

Hydraulic pump

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

Electricity

Automobile Engineering Practice Set-6

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