Automobile Engineering Practice Set-6

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1. 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

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

1-3-2-4

1-2-3-4

1-3-4-2

1-2-4-3

3. Bead wires are made of

Zinc

Steel

Aluminium

Copper

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

Passenger cars

Tractors

Matadors

Trucks

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

Smaller than the positive terminal post

None of these

Larger than the positive terminal post

Of the same size as the positive terminal post

6. The specific gravity of Diesel is about

0.95

0.75

0.85

0.65

7. Wheel base of a vehicle is the

Extreme length of the vehicle

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Distance between the centres of the rear tyres

8. The effect of having excess camber is

Too much traction

Hard steering

Uneven tyre wear

Excessive steering alignment torque

9. The parking brake generally acts on

Propeller shaft

Rear wheels

Front wheels

Front and rear wheels

10. 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

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11. The Diesel engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

None of these

Steam engines

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

110

90

100

120

13. The power source for a brake booster is

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

Electricity

Hydraulic pump

Exhaust manifold pressure

14. Odometer is an instrument used for measurement of

Engine r.p.m.

Distance

Fuel consumption

Power

15. The brake pedal during ABS operation

All of the above

Is pushed upward forcefully

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

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

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

Rotate the tyres

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

Fouling of spark plug by gasoline

None of these

Overheating of the engine

Incomplete valve closure

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

Belt driven by crankshaft

Belt driven by camshaft

Chain driven by crankshaft

Belt driven by drive-shaft

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

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

Supply electric power

Continually recharges the battery

20. The valve tappet clearance is measured by

Vernier caliper

Engineering scale

Screw pitch gauge

Feeler gauge

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21. The Diesel engine works on

Otto cycle

Diesel cycle

Rankine cycle

Carnot cycle

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

1.28

1.00

2.81

1.82

23. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Jerky starts

Vehicle speed

24. 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/4

P.L.A.N

2 × P.L.A.N

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

Air-fuel ratio

Air temperature

Air flow speed

Exhaust gas volume

26. Which of the following oil is more viscous?

SAE 40

SAE 80

SAE 70

SAE 30

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

Head light bulb

Ignition warning bulb

Parking light bulb

Stop light bulb

28. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

Reduces intake noise

Distributes intake air equally to the cylinders

29. The fuel that detonates easily, is

Alcohol

Iso-octane

Benzene

N-heptane

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

None of these

Splashing action of the crankshaft

The pressure created by the oil pump

Gravity

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

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

Tendency to assume toe-out orientation

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

Crank arm

Small end

Big end

Journal

33. The function of a governor in automobiles is to

Limit the vehicle speed

Limit the power

Maintain constant engine speed

Maximise the fuel economy

34. 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

Judder during braking

Rapid wearing of the brake pads

35. 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 drive shafts are splined to the differential carrier.

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

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

Small particles

None of these

Large particles

Sharp edged fragments

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

20%

5%

10%

15%

38. The ease with which petrol vaporizes is called its

Cetane number

Oxidation

Octane number

Volatility

39. Tachometer in a vehicle measures

Engine r.p.m.

Fuel consumption

Distance

Speed

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

Clearance volume

None of these

Cylinder volume

Exhaust volume

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

65

14

175

82

42. The specific gravity of petrol is about

0.85

1.25

0.95

0.75

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

Operates the clutch

Meshes the gears

Moves the synchronizer

Selects the synchronizer

44. The commonly used antifreeze solution in automobiles is

Freon-12

Ethylene glycol

Carbon disulphide

Ammonium chloride

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

Improved power output

Improved fuel efficiency

Improved emission

All of these

Automobile Engineering Practice Set-6

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