Automobile Engineering Practice Set-6

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1. Bead wires are made of

Copper

Aluminium

Zinc

Steel

2. The Diesel engines are also known as

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

None of these

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

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

None of these

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

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the tyre pressure

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

Big end

Small end

Journal

Crank arm

6. The brake pedal during ABS operation

Is pushed upward forcefully

All of the above

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

7. 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

P.L.A.N/2

P.L.A.N/4

8. Tachometer in a vehicle measures

Engine r.p.m.

Speed

Distance

Fuel consumption

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

120

90

100

110

10. Engine misfiring is likely to result from

Vapours lock in the fuel only

Spark plug gap too small

Spark plug gap too wide

Incorrect fuel air mixture

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11. The specific gravity of petrol is about

1.25

0.85

0.75

0.95

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

Air temperature

Air flow speed

Exhaust gas volume

Air-fuel ratio

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

Tendency to assume toe-out orientation

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

14. The specific gravity of Diesel is about

0.75

0.95

0.85

0.65

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

Improved emission

All of these

Improved fuel efficiency

Improved power output

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

14

65

175

82

17. Odometer is an instrument used for measurement of

Engine r.p.m.

Power

Distance

Fuel consumption

18. The function of a governor in automobiles is to

Limit the vehicle speed

Maximise the fuel economy

Maintain constant engine speed

Limit the power

19. 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 drive shafts are splined to the differential carrier.

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.

20. The valve tappet clearance is measured by

Feeler gauge

Engineering scale

Screw pitch gauge

Vernier caliper

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

Large particles

None of these

Sharp edged fragments

Small particles

22. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Ethylene glycol

Freon-12

Carbon disulphide

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

20%

15%

10%

5%

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

Chain driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

Belt driven by crankshaft

25. The Diesel engine works on

Rankine cycle

Otto cycle

Carnot cycle

Diesel cycle

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

2.81

1.28

1.00

1.82

27. The ease with which petrol vaporizes is called its

Octane number

Volatility

Cetane number

Oxidation

28. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Jerky starts

Vehicle speed

29. 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

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

None of these

Overheating of the engine

Incomplete valve closure

Fouling of spark plug by gasoline

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31. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 40

SAE 70

32. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

33. The effect of having excess camber is

Excessive steering alignment torque

Too much traction

Hard steering

Uneven tyre wear

34. The power source for a brake booster is

Exhaust manifold pressure

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

Hydraulic pump

Electricity

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

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Localized wearing of the brake pads

Judder during braking

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

Splashing action of the crankshaft

None of these

Gravity

The pressure created by the oil pump

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

Partly converts engine power into electric power

Continually recharges the battery

Supply electric power

Converts mechanical energy into electrical energy

38. 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

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

Passenger cars

Matadors

Tractors

Trucks

40. The parking brake generally acts on

Front and rear wheels

Front wheels

Propeller shaft

Rear wheels

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

1-3-2-4

1-2-4-3

1-3-4-2

1-2-3-4

42. 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

43. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Reduces intake noise

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

44. 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

45. The fuel that detonates easily, is

Iso-octane

Benzene

N-heptane

Alcohol

Automobile Engineering Practice Set-6

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