Automobile Engineering Practice Set-6

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

1-3-4-2

1-3-2-4

1-2-4-3

1-2-3-4

2. 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 differential carrier houses differential pinion gears and side gears.

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

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

Moves the synchronizer

Selects the synchronizer

Operates the clutch

Meshes the gears

4. The function of a governor in automobiles is to

Limit the vehicle speed

Limit the power

Maximise the fuel economy

Maintain constant engine speed

5. The specific gravity of Diesel is about

0.65

0.85

0.75

0.95

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)

2 × P.L.A.N

P.L.A.N

P.L.A.N/2

P.L.A.N/4

7. 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

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

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

Small particles

Large particles

Sharp edged fragments

None of these

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

Continually recharges the battery

Converts mechanical energy into electrical energy

Supply electric power

Partly converts engine power into electric power

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

Cylinder volume

Exhaust volume

None of these

Clearance volume

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

Incomplete valve closure

None of these

Overheating of the engine

Fouling of spark plug by gasoline

12. Odometer is an instrument used for measurement of

Fuel consumption

Engine r.p.m.

Power

Distance

13. Bead wires are made of

Steel

Aluminium

Copper

Zinc

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

Big end

Journal

Small end

Crank arm

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

Exhaust gas volume

Air flow speed

Air temperature

Air-fuel ratio

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

Improved power output

Improved fuel efficiency

All of these

Improved emission

17. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

Reduces intake noise

Cools the intake air to a suitable temperature

18. Wheel base of a vehicle is the

Extreme length of the vehicle

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

19. Tachometer in a vehicle measures

Speed

Distance

Fuel consumption

Engine r.p.m.

20. The valve tappet clearance is measured by

Engineering scale

Feeler gauge

Vernier caliper

Screw pitch gauge

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

14

65

82

175

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

Parking light bulb

Ignition warning bulb

Head light bulb

Stop light bulb

23. The power source for a brake booster is

Electricity

Hydraulic pump

Exhaust manifold pressure

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

24. The effect of having excess camber is

Hard steering

Too much traction

Excessive steering alignment torque

Uneven tyre wear

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

Splashing action of the crankshaft

The pressure created by the oil pump

Gravity

None of these

26. The fuel that detonates easily, is

N-heptane

Alcohol

Iso-octane

Benzene

27. The parking brake generally acts on

Propeller shaft

Front wheels

Rear wheels

Front and rear wheels

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

Maintain directional control

Prevent uneven tyre wear

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

Compensate for wear in the steering linkage

29. The Diesel engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

30. Which of the following oil is more viscous?

SAE 40

SAE 30

SAE 80

SAE 70

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31. The brake pedal during ABS operation

Transmits slight kickback to the driver's foot

All of the above

Is pushed upward forcefully

Pedal stroke becomes longer

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

Trucks

Passenger cars

Matadors

Tractors

33. Engine misfiring is likely to result from

Vapours lock in the fuel only

Spark plug gap too wide

Spark plug gap too small

Incorrect fuel air mixture

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

Belt driven by drive-shaft

Belt driven by camshaft

Belt driven by crankshaft

Chain driven by crankshaft

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

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Rotate the tyres

Adjust the damper spring tension

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

1.82

1.28

1.00

2.81

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

Larger than the positive terminal post

Smaller than the positive terminal post

None of these

Of the same size as the positive terminal post

38. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

Torsional vibrations

None of these

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

20%

15%

5%

10%

40. The specific gravity of petrol is about

1.25

0.95

0.85

0.75

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

Ineffectiveness of the brakes

Judder during braking

Localized wearing of the brake pads

Rapid wearing of the brake pads

42. The Diesel engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

43. The ease with which petrol vaporizes is called its

Oxidation

Cetane number

Octane number

Volatility

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

90

120

110

100

45. The commonly used antifreeze solution in automobiles is

Freon-12

Ammonium chloride

Carbon disulphide

Ethylene glycol

Automobile Engineering Practice Set-6

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