Automobile Engineering Practice Set-6

Page 1 of 5

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. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Fuel consumption

Power

3. The ease with which petrol vaporizes is called its

Octane number

Volatility

Cetane number

Oxidation

4. Which one of the following statement correctly describes the construction of a bevel gear type differential?

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

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

The drive shafts are splined to the differential carrier.

The differential carrier houses differential pinion gears and side gears.

5. The valve tappet clearance is measured by

Screw pitch gauge

Vernier caliper

Engineering scale

Feeler gauge

6. The specific gravity of petrol is about

0.75

0.85

1.25

0.95

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

10%

15%

20%

5%

8. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ammonium chloride

Freon-12

Ethylene glycol

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

Judder during braking

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

10. 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

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

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

The vehicle to pull to the side of lesser inclination

12. The Diesel engines are also known as

Steam engines

None of these

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

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

Belt driven by camshaft

Chain driven by crankshaft

Belt driven by drive-shaft

Belt driven by crankshaft

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

Prevent uneven tyre wear

Maintain directional control

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

Compensate for wear in the steering linkage

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

120

100

90

110

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

None of these

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

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

Crank arm

Small end

Journal

Big end

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

1-2-3-4

1-3-2-4

1-2-4-3

1-3-4-2

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

Selects the synchronizer

Operates the clutch

Moves the synchronizer

Meshes the gears

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

Gravity

The pressure created by the oil pump

Splashing action of the crankshaft

None of these

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21. The power source for a brake booster is

Hydraulic pump

Electricity

Exhaust manifold pressure

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

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

Parking light bulb

Stop light bulb

Ignition warning bulb

Head light bulb

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

82

65

175

14

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/4

2 × P.L.A.N

P.L.A.N/2

P.L.A.N

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

Converts mechanical energy into electrical energy

Supply electric power

Continually recharges the battery

Partly converts engine power into electric power

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

Passenger cars

Tractors

Matadors

Trucks

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

Improved emission

Improved fuel efficiency

All of these

Improved power output

28. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

Limit the power

29. Bead wires are made of

Steel

Aluminium

Copper

Zinc

30. Which of the following oil is more viscous?

SAE 80

SAE 40

SAE 30

SAE 70

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

Small particles

None of these

Sharp edged fragments

Large particles

32. The brake pedal during ABS operation

All of the above

Pedal stroke becomes longer

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

33. The parking brake generally acts on

Front and rear wheels

Propeller shaft

Front wheels

Rear wheels

34. 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

35. The fuel that detonates easily, is

Benzene

Iso-octane

Alcohol

N-heptane

36. Tachometer in a vehicle measures

Fuel consumption

Speed

Distance

Engine r.p.m.

37. The effect of having excess camber is

Excessive steering alignment torque

Hard steering

Uneven tyre wear

Too much traction

38. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

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

Clearance volume

Exhaust volume

None of these

Cylinder volume

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

2.81

1.82

1.00

1.28

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

Adjust the tyre pressure

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

42. Cushioning springs in clutch plate reduces

Jerky starts

None of these

Torsional vibrations

Vehicle speed

43. The main function of intake manifold is that it

Reduces intake noise

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

44. The Diesel engine works on

Carnot cycle

Otto cycle

Rankine cycle

Diesel cycle

45. The specific gravity of Diesel is about

0.75

0.95

0.65

0.85

Automobile Engineering Practice Set-6

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