Automobile Engineering Practice Set-6

Page 1 of 5

1. The parking brake generally acts on

Rear wheels

Front and rear wheels

Front wheels

Propeller shaft

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

65

82

14

175

3. 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

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

15%

10%

20%

5%

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

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

Maintain directional control

Prevent uneven tyre wear

Compensate for wear in the steering linkage

6. 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

2 × P.L.A.N

P.L.A.N/4

7. 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

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

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

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

Cylinder volume

None of these

Clearance volume

Exhaust volume

10. 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

Ineffectiveness of the brakes

Judder during braking

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11. The specific gravity of Diesel is about

0.75

0.95

0.85

0.65

12. The Diesel engine works on

Otto cycle

Carnot cycle

Rankine cycle

Diesel cycle

13. 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 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.

The differential carrier houses differential pinion gears and side gears.

14. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Carbon disulphide

Ethylene glycol

Freon-12

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

2.81

1.28

1.00

1.82

16. Bead wires are made of

Zinc

Aluminium

Copper

Steel

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

Overheating of the engine

None of these

Fouling of spark plug by gasoline

Incomplete valve closure

18. The power source for a brake booster is

Electricity

Exhaust manifold pressure

Hydraulic pump

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

19. The valve tappet clearance is measured by

Vernier caliper

Engineering scale

Feeler gauge

Screw pitch gauge

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

The pressure created by the oil pump

None of these

Gravity

Splashing action of the crankshaft

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

Chain driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Belt driven by crankshaft

22. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the vehicle speed

Maintain constant engine speed

Limit the power

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

110

120

90

100

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

Partly converts engine power into electric power

Supply electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

25. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Reduces intake noise

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

26. The effect of having excess camber is

Uneven tyre wear

Hard steering

Too much traction

Excessive steering alignment torque

27. Engine misfiring is likely to result from

Spark plug gap too small

Spark plug gap too wide

Vapours lock in the fuel only

Incorrect fuel air mixture

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

Crank arm

Small end

Journal

Big end

29. Tachometer in a vehicle measures

Fuel consumption

Speed

Distance

Engine r.p.m.

30. Cushioning springs in clutch plate reduces

None of these

Jerky starts

Vehicle speed

Torsional vibrations

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31. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

Distance between the centres of the rear tyres

32. The fuel that detonates easily, is

N-heptane

Iso-octane

Alcohol

Benzene

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

Smaller than the positive terminal post

Of the same size as the positive terminal post

None of these

Larger than the positive terminal post

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

Tractors

Passenger cars

Trucks

Matadors

35. Odometer is an instrument used for measurement of

Power

Distance

Fuel consumption

Engine r.p.m.

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

Stop light bulb

Parking light bulb

Head light bulb

Ignition warning bulb

37. Which of the following oil is more viscous?

SAE 70

SAE 80

SAE 30

SAE 40

38. The specific gravity of petrol is about

0.85

0.75

0.95

1.25

39. The ease with which petrol vaporizes is called its

Cetane number

Octane number

Oxidation

Volatility

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

Air flow speed

Air-fuel ratio

Exhaust gas volume

Air temperature

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

1-2-4-3

1-3-4-2

1-2-3-4

1-3-2-4

42. The Diesel engines are also known as

Steam engines

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

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

Moves the synchronizer

Operates the clutch

Selects the synchronizer

Meshes the gears

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

All of these

Improved power output

Improved emission

Improved fuel efficiency

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

Small particles

Sharp edged fragments

None of these

Large particles

Automobile Engineering Practice Set-6

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