Automobile Engineering Practice Set-6

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1. The Diesel engines are also known as

Spark ignition (S.I.) engines

Steam engines

Compression ignition (C.I.) engines

None of these

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

14

175

82

65

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

10%

20%

15%

5%

4. The Diesel engine works on

Rankine cycle

Diesel cycle

Carnot cycle

Otto cycle

5. The ease with which petrol vaporizes is called its

Volatility

Octane number

Cetane number

Oxidation

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

None of these

Clearance volume

Exhaust volume

Cylinder volume

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

Matadors

Tractors

Trucks

Passenger cars

8. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Fuel consumption

Power

9. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Reduces intake noise

Promotes the mixture of air and fuel

10. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

Limit the power

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11. Tachometer in a vehicle measures

Engine r.p.m.

Distance

Fuel consumption

Speed

12. 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

13. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Engineering scale

Screw pitch gauge

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

Rotate the tyres

Adjust the tyre pressure

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

15. 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

P.L.A.N/4

P.L.A.N/2

2 × P.L.A.N

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

Overheating of the engine

Incomplete valve closure

None of these

Fouling of spark plug by gasoline

17. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Freon-12

Ethylene glycol

Ammonium chloride

18. Which of the following oil is more viscous?

SAE 80

SAE 40

SAE 70

SAE 30

19. The power source for a brake booster is

Electricity

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

Hydraulic pump

Exhaust manifold pressure

20. The specific gravity of petrol is about

0.85

0.75

1.25

0.95

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

Air-fuel ratio

Air temperature

Exhaust gas volume

Air flow speed

22. 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

23. Engine misfiring is likely to result from

Spark plug gap too wide

Spark plug gap too small

Vapours lock in the fuel only

Incorrect fuel air mixture

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

Journal

Crank arm

Small end

Big end

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

100

90

110

120

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

1-2-4-3

1-2-3-4

1-3-4-2

1-3-2-4

27. 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

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

The pressure created by the oil pump

Gravity

None of these

Splashing action of the crankshaft

29. The effect of having excess camber is

Too much traction

Hard steering

Excessive steering alignment torque

Uneven tyre wear

30. 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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31. The fuel that detonates easily, is

N-heptane

Alcohol

Iso-octane

Benzene

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

Small particles

Sharp edged fragments

None of these

Large particles

33. Cushioning springs in clutch plate reduces

Torsional vibrations

Vehicle speed

Jerky starts

None of these

34. The parking brake generally acts on

Propeller shaft

Front wheels

Rear wheels

Front and rear wheels

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

2.81

1.00

1.82

1.28

36. Bead wires are made of

Steel

Copper

Zinc

Aluminium

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

All of these

Improved emission

Improved fuel efficiency

Improved power output

38. The specific gravity of Diesel is about

0.75

0.65

0.85

0.95

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

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Supply electric power

Continually recharges the battery

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

Smaller than the positive terminal post

Larger than the positive terminal post

None of these

Of the same size as the positive terminal post

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

Meshes the gears

Selects the synchronizer

Moves the synchronizer

Operates the clutch

42. The brake pedal during ABS operation

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

All of the above

Is pushed upward forcefully

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

Belt driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Chain driven by crankshaft

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

Stop light bulb

Head light bulb

Parking light bulb

Ignition warning bulb

45. 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.

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

Automobile Engineering Practice Set-6

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Automobile Engineering Practice Set-6

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