Automobile Engineering Practice Set-6

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1. Engine misfiring is likely to result from

Vapours lock in the fuel only

Spark plug gap too small

Incorrect fuel air mixture

Spark plug gap too wide

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

The differential carrier houses differential pinion gears and side gears.

The drive shafts are splined to the differential carrier.

3. Bead wires are made of

Aluminium

Copper

Zinc

Steel

4. The Diesel engines are also known as

None of these

Steam engines

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

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

None of these

Large particles

Sharp edged fragments

Small particles

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

Chain driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Belt driven by crankshaft

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

Partly converts engine power into electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

Supply electric power

8. The brake pedal during ABS operation

Transmits slight kickback to the driver's foot

All of the above

Is pushed upward forcefully

Pedal stroke becomes longer

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

Head light bulb

Parking light bulb

Ignition warning bulb

Stop light bulb

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

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

Prevent uneven tyre wear

Maintain directional control

Compensate for wear in the steering linkage

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11. The parking brake generally acts on

Front and rear wheels

Propeller shaft

Rear wheels

Front wheels

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

The pressure created by the oil pump

None of these

Splashing action of the crankshaft

Gravity

13. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

Limit the power

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

Air flow speed

Air temperature

Exhaust gas volume

Air-fuel ratio

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

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

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

Selects the synchronizer

Moves the synchronizer

Meshes the gears

Operates the clutch

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

100

120

110

90

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

Small end

Journal

Big end

Crank arm

19. The specific gravity of petrol is about

0.95

1.25

0.75

0.85

20. 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

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21. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ammonium chloride

Ethylene glycol

Freon-12

22. 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

23. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

24. The ease with which petrol vaporizes is called its

Cetane number

Octane number

Volatility

Oxidation

25. The fuel that detonates easily, is

Benzene

N-heptane

Alcohol

Iso-octane

26. 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

27. The valve tappet clearance is measured by

Feeler gauge

Screw pitch gauge

Vernier caliper

Engineering scale

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

None of these

Smaller than the positive terminal post

Of the same size as the positive terminal post

Larger than the positive terminal post

29. Odometer is an instrument used for measurement of

Distance

Fuel consumption

Engine r.p.m.

Power

30. Tachometer in a vehicle measures

Distance

Fuel consumption

Engine r.p.m.

Speed

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31. The specific gravity of Diesel is about

0.65

0.95

0.85

0.75

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

175

65

14

82

33. 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

P.L.A.N/2

2 × P.L.A.N

34. The effect of having excess camber is

Hard steering

Uneven tyre wear

Too much traction

Excessive steering alignment torque

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

20%

5%

15%

10%

36. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

Reduces intake noise

37. 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

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

Passenger cars

Matadors

Trucks

Tractors

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

2.81

1.82

1.00

1.28

40. Which of the following oil is more viscous?

SAE 70

SAE 80

SAE 30

SAE 40

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41. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

None of these

Torsional vibrations

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

None of these

Cylinder volume

Exhaust volume

Clearance volume

43. The Diesel engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

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

Incomplete valve closure

Overheating of the engine

None of these

Fouling of spark plug by gasoline

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

All of these

Improved power output

Improved fuel efficiency

Improved emission

Automobile Engineering Practice Set-6

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