Automobile Engineering Practice Set-6

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

Incomplete valve closure

Fouling of spark plug by gasoline

None of these

Overheating of the engine

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

Smaller than the positive terminal post

Larger than the positive terminal post

Of the same size as the positive terminal post

None of these

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

Trucks

Matadors

Tractors

Passenger cars

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

Judder during braking

Localized wearing of the brake pads

Ineffectiveness of the brakes

Rapid wearing of the brake pads

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

Parking light bulb

Head light bulb

Stop light bulb

Ignition warning bulb

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

120

90

110

100

7. Which of the following oil is more viscous?

SAE 30

SAE 40

SAE 70

SAE 80

8. 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

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

Adjust the tyre pressure

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

10. The Diesel engines are also known as

None of these

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

Steam engines

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11. 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

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

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

13. Bead wires are made of

Zinc

Steel

Copper

Aluminium

14. The fuel that detonates easily, is

Alcohol

N-heptane

Benzene

Iso-octane

15. The power source for a brake booster is

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

Hydraulic pump

Exhaust manifold pressure

Electricity

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

1.82

1.28

1.00

2.81

17. 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

Extreme length of the vehicle

Distance between the centres of the front tyres

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

All of these

Improved power output

Improved fuel efficiency

Improved emission

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

Crank arm

Journal

Small end

Big end

20. Odometer is an instrument used for measurement of

Fuel consumption

Engine r.p.m.

Distance

Power

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21. 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

22. The effect of having excess camber is

Excessive steering alignment torque

Hard steering

Uneven tyre wear

Too much traction

23. The specific gravity of petrol is about

0.85

1.25

0.75

0.95

24. The valve tappet clearance is measured by

Vernier caliper

Screw pitch gauge

Engineering scale

Feeler gauge

25. The commonly used antifreeze solution in automobiles is

Freon-12

Carbon disulphide

Ammonium chloride

Ethylene glycol

26. Engine misfiring is likely to result from

Spark plug gap too wide

Incorrect fuel air mixture

Vapours lock in the fuel only

Spark plug gap too small

27. Tachometer in a vehicle measures

Engine r.p.m.

Distance

Speed

Fuel consumption

28. 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

29. The Diesel engine works on

Rankine cycle

Otto cycle

Carnot cycle

Diesel cycle

30. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Reduces intake noise

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

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31. The specific gravity of Diesel is about

0.65

0.85

0.75

0.95

32. The parking brake generally acts on

Propeller shaft

Rear wheels

Front wheels

Front and rear wheels

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

Meshes the gears

Selects the synchronizer

Operates the clutch

Moves the synchronizer

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

Splashing action of the crankshaft

Gravity

None of these

The pressure created by the oil pump

35. 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.

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

Air flow speed

Air temperature

Air-fuel ratio

Exhaust gas volume

37. 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

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

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

Small particles

Large particles

Sharp edged fragments

None of these

39. 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

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

65

82

175

14

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

5%

20%

15%

10%

42. Cushioning springs in clutch plate reduces

None of these

Vehicle speed

Torsional vibrations

Jerky starts

43. The function of a governor in automobiles is to

Limit the power

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

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

None of these

Clearance volume

Cylinder volume

Exhaust volume

45. The ease with which petrol vaporizes is called its

Cetane number

Volatility

Oxidation

Octane number

Automobile Engineering Practice Set-6

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