Automobile Engineering Practice Set-6

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1. Tachometer in a vehicle measures

Distance

Speed

Engine r.p.m.

Fuel consumption

2. Odometer is an instrument used for measurement of

Power

Fuel consumption

Distance

Engine r.p.m.

3. 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

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

Air temperature

Air-fuel ratio

Air flow speed

Exhaust gas volume

5. The effect of having excess camber is

Too much traction

Excessive steering alignment torque

Uneven tyre wear

Hard steering

6. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Reduces intake noise

7. 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

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

Converts mechanical energy into electrical energy

Supply electric power

Partly converts engine power into electric power

Continually recharges the battery

9. Which of the following oil is more viscous?

SAE 40

SAE 70

SAE 30

SAE 80

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

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

The vehicle to pull to the side of lesser inclination

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11. The Diesel engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

12. Bead wires are made of

Copper

Aluminium

Zinc

Steel

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

175

14

65

82

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

Improved fuel efficiency

Improved power output

Improved emission

All of these

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

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the tyre pressure

Adjust the damper spring tension

16. The specific gravity of petrol is about

0.85

1.25

0.95

0.75

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

None of these

Fouling of spark plug by gasoline

Incomplete valve closure

Overheating of the engine

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

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.

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

Compensate for wear in the steering linkage

Prevent uneven tyre wear

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

Maintain directional control

20. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

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21. The power source for a brake booster is

Hydraulic pump

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

Exhaust manifold pressure

Electricity

22. 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

23. The specific gravity of Diesel is about

0.95

0.85

0.65

0.75

24. The ease with which petrol vaporizes is called its

Cetane number

Octane number

Volatility

Oxidation

25. 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

26. 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 crankshaft

Belt driven by drive-shaft

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

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

Rapid wearing of the brake pads

28. The brake pedal during ABS operation

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

Is pushed upward forcefully

All of the above

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

Moves the synchronizer

Selects the synchronizer

Meshes the gears

Operates the clutch

30. Cushioning springs in clutch plate reduces

Jerky starts

None of these

Vehicle speed

Torsional vibrations

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31. Wheel base of a vehicle is the

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

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

15%

10%

5%

20%

33. 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)

2 × P.L.A.N

P.L.A.N

P.L.A.N/2

P.L.A.N/4

34. The Diesel engine works on

Rankine cycle

Otto cycle

Diesel cycle

Carnot cycle

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

Matadors

Passenger cars

Trucks

Tractors

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

Small end

Big end

Crank arm

Journal

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

Head light bulb

Ignition warning bulb

Stop light bulb

Parking light bulb

38. 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

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

Sharp edged fragments

Large particles

Small particles

None of these

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

120

100

90

110

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41. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ammonium chloride

Freon-12

Ethylene glycol

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

1.28

1.00

1.82

2.81

43. The fuel that detonates easily, is

Iso-octane

N-heptane

Benzene

Alcohol

44. The parking brake generally acts on

Propeller shaft

Rear wheels

Front and rear wheels

Front wheels

45. The valve tappet clearance is measured by

Vernier caliper

Feeler gauge

Engineering scale

Screw pitch gauge

Automobile Engineering Practice Set-6

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