Automobile Engineering Practice Set-6

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1. The Diesel engine works on

Carnot cycle

Rankine cycle

Otto cycle

Diesel cycle

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

Belt driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

Chain driven by crankshaft

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

1.28

1.82

1.00

2.81

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

Selects the synchronizer

Operates the clutch

Meshes the gears

Moves the synchronizer

5. The specific gravity of petrol is about

0.95

1.25

0.85

0.75

6. Bead wires are made of

Zinc

Copper

Aluminium

Steel

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

Stop light bulb

Head light bulb

Ignition warning bulb

Parking light bulb

8. Tachometer in a vehicle measures

Fuel consumption

Speed

Engine r.p.m.

Distance

9. The brake pedal during ABS operation

Transmits slight kickback to the driver's foot

Is pushed upward forcefully

Pedal stroke becomes longer

All of the above

10. The power source for a brake booster is

Electricity

Exhaust manifold pressure

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

Hydraulic pump

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

10%

15%

20%

5%

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

Matadors

Tractors

Passenger cars

Trucks

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

Air temperature

Air flow speed

Air-fuel ratio

Exhaust gas volume

14. 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/2

P.L.A.N/4

2 × P.L.A.N

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

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.

16. The specific gravity of Diesel is about

0.95

0.65

0.85

0.75

17. The effect of having excess camber is

Uneven tyre wear

Too much traction

Hard steering

Excessive steering alignment torque

18. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too small

Spark plug gap too wide

Vapours lock in the fuel only

19. The parking brake generally acts on

Rear wheels

Propeller shaft

Front and rear wheels

Front wheels

20. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Freon-12

Ethylene glycol

Carbon disulphide

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21. 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

22. The ease with which petrol vaporizes is called its

Octane number

Oxidation

Volatility

Cetane number

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

Localized wearing of the brake pads

Rapid wearing of the brake pads

Judder during braking

Ineffectiveness of the brakes

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

100

90

110

120

25. Odometer is an instrument used for measurement of

Distance

Fuel consumption

Engine r.p.m.

Power

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

Continually recharges the battery

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

Supply electric power

27. The function of a governor in automobiles is to

Maintain constant engine speed

Maximise the fuel economy

Limit the vehicle speed

Limit the power

28. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Reduces intake noise

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

Journal

Big end

Crank arm

Small end

30. The fuel that detonates easily, is

N-heptane

Alcohol

Iso-octane

Benzene

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

Small particles

Sharp edged fragments

None of these

Large particles

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

65

82

14

175

33. The valve tappet clearance is measured by

Vernier caliper

Engineering scale

Screw pitch gauge

Feeler gauge

34. 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

35. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Jerky starts

Vehicle speed

36. 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

37. The Diesel engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

38. Which of the following oil is more viscous?

SAE 30

SAE 40

SAE 70

SAE 80

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

All of these

Improved power output

Improved fuel efficiency

Improved emission

40. 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

Extreme length of the vehicle

Distance between the centres of the front tyres

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

Overheating of the engine

None of these

Incomplete valve closure

Fouling of spark plug by gasoline

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

Compensate for wear in the steering linkage

Maintain directional control

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

Prevent uneven tyre wear

43. 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

Splashing action of the crankshaft

Gravity

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

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

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

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

Tendency to assume toe-out orientation

Automobile Engineering Practice Set-6

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