Automobile Engineering Practice Set-6

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

1.00

1.82

2.81

1.28

2. 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

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

1-2-3-4

1-3-4-2

1-3-2-4

1-2-4-3

4. Wheel base of a vehicle is the

Distance between the centres of the front and rear wheels

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Extreme length of the vehicle

5. 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

P.L.A.N/2

6. The function of a governor in automobiles is to

Limit the vehicle speed

Maximise the fuel economy

Maintain constant engine speed

Limit the power

7. The effect of having excess camber is

Uneven tyre wear

Hard steering

Too much traction

Excessive steering alignment torque

8. The specific gravity of Diesel is about

0.75

0.95

0.85

0.65

9. The ease with which petrol vaporizes is called its

Volatility

Octane number

Oxidation

Cetane number

10. The specific gravity of petrol is about

1.25

0.75

0.95

0.85

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

Passenger cars

Trucks

Tractors

Matadors

12. 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

13. 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

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

110

120

100

90

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

None of these

The pressure created by the oil pump

Gravity

Splashing action of the crankshaft

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

Exhaust gas volume

Air flow speed

Air temperature

Air-fuel ratio

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

All of these

Improved emission

Improved power output

Improved fuel efficiency

18. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Vehicle speed

Jerky starts

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

Ignition warning bulb

Parking light bulb

Head light bulb

Stop light bulb

20. Which of the following oil is more viscous?

SAE 40

SAE 30

SAE 80

SAE 70

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

Supply electric power

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

Continually recharges the battery

22. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Engineering scale

Screw pitch gauge

23. 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

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

Operates the clutch

Moves the synchronizer

Meshes the gears

Selects the synchronizer

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

Maintain directional control

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

Compensate for wear in the steering linkage

Prevent uneven tyre wear

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

None of these

Incomplete valve closure

Overheating of the engine

Fouling of spark plug by gasoline

27. The Diesel engine works on

Carnot cycle

Rankine cycle

Diesel cycle

Otto cycle

28. 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

29. Tachometer in a vehicle measures

Speed

Fuel consumption

Engine r.p.m.

Distance

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

Journal

Crank arm

Big end

Small end

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31. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

32. 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

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

5%

10%

15%

20%

34. Bead wires are made of

Zinc

Steel

Copper

Aluminium

35. Engine misfiring is likely to result from

Spark plug gap too small

Incorrect fuel air mixture

Spark plug gap too wide

Vapours lock in the fuel only

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

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

Adjust the tyre pressure

Rotate the tyres

37. The fuel that detonates easily, is

Alcohol

Iso-octane

Benzene

N-heptane

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

Small particles

Large particles

None of these

Sharp edged fragments

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

14

65

175

82

40. 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

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41. The parking brake generally acts on

Propeller shaft

Rear wheels

Front wheels

Front and rear wheels

42. 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.

The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.

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

43. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Ammonium chloride

Freon-12

Carbon disulphide

44. 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

45. Odometer is an instrument used for measurement of

Fuel consumption

Power

Distance

Engine r.p.m.

Automobile Engineering Practice Set-6

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