Automobile Engineering Practice Set-6

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1. The specific gravity of Diesel is about

0.65

0.95

0.85

0.75

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

Supply electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

Partly converts engine power into electric power

3. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Screw pitch gauge

Engineering scale

4. The function of a governor in automobiles is to

Maintain constant engine speed

Limit the power

Maximise the fuel economy

Limit the vehicle speed

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

Exhaust gas volume

Air-fuel ratio

Air flow speed

Air temperature

6. 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

7. 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.

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

All of these

Improved fuel efficiency

Improved power output

Improved emission

9. 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

10. The Diesel engine works on

Rankine cycle

Diesel cycle

Carnot cycle

Otto cycle

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

The vehicle to pull to the side of lesser inclination

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

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

Selects the synchronizer

Meshes the gears

Operates the clutch

Moves the synchronizer

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

110

120

100

90

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

1.28

2.81

1.82

1.00

15. Tachometer in a vehicle measures

Engine r.p.m.

Speed

Fuel consumption

Distance

16. Which of the following oil is more viscous?

SAE 80

SAE 40

SAE 30

SAE 70

17. The ease with which petrol vaporizes is called its

Oxidation

Volatility

Octane number

Cetane number

18. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

Torsional vibrations

None of these

19. The specific gravity of petrol is about

1.25

0.75

0.95

0.85

20. Bead wires are made of

Zinc

Copper

Steel

Aluminium

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

Passenger cars

Tractors

Trucks

Matadors

22. The Diesel engines are also known as

Steam engines

None of these

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

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

Sharp edged fragments

Large particles

Small particles

None of these

24. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ethylene glycol

Ammonium chloride

Freon-12

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

Ineffectiveness of the brakes

Rapid wearing of the brake pads

Judder during braking

Localized wearing of the brake pads

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

Exhaust volume

None of these

Clearance volume

Cylinder volume

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

175

82

14

65

28. The parking brake generally acts on

Propeller shaft

Front and rear wheels

Rear wheels

Front wheels

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

Head light bulb

Stop light bulb

Ignition warning bulb

Parking light bulb

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

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

None of these

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31. 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

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

Gravity

The pressure created by the oil pump

None of these

Splashing action of the crankshaft

33. The effect of having excess camber is

Uneven tyre wear

Excessive steering alignment torque

Hard steering

Too much traction

34. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Reduces intake noise

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

Journal

Crank arm

Big end

Small end

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

5%

20%

10%

15%

37. The power source for a brake booster is

Hydraulic pump

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

Exhaust manifold pressure

Electricity

38. The brake pedal during ABS operation

All of the above

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

39. The fuel that detonates easily, is

Iso-octane

Benzene

Alcohol

N-heptane

40. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

Distance between the centres of the front tyres

Extreme length of the vehicle

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41. Odometer is an instrument used for measurement of

Power

Engine r.p.m.

Fuel consumption

Distance

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

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by camshaft

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

Fouling of spark plug by gasoline

None of these

Incomplete valve closure

Overheating of the engine

44. Engine misfiring is likely to result from

Incorrect fuel air mixture

Vapours lock in the fuel only

Spark plug gap too small

Spark plug gap too wide

45. 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

2 × P.L.A.N

P.L.A.N/4

Automobile Engineering Practice Set-6

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