Automobile Engineering Practice Set-6

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1. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Reduces intake noise

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

2. The specific gravity of petrol is about

1.25

0.75

0.85

0.95

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

Cylinder volume

None of these

Exhaust volume

Clearance volume

4. The effect of having excess camber is

Uneven tyre wear

Excessive steering alignment torque

Hard steering

Too much traction

5. The ease with which petrol vaporizes is called its

Octane number

Cetane number

Volatility

Oxidation

6. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Carbon disulphide

Ethylene glycol

Freon-12

7. 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

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

90

120

100

110

9. The power source for a brake booster is

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

Electricity

Exhaust manifold pressure

Hydraulic pump

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

None of these

Large particles

Small particles

Sharp edged fragments

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

Air-fuel ratio

Air temperature

Exhaust gas volume

Air flow speed

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

1-3-4-2

1-2-4-3

1-3-2-4

1-2-3-4

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

Passenger cars

Trucks

Tractors

Matadors

14. Engine misfiring is likely to result from

Spark plug gap too wide

Vapours lock in the fuel only

Incorrect fuel air mixture

Spark plug gap too small

15. The specific gravity of Diesel is about

0.65

0.75

0.95

0.85

16. The Diesel engine works on

Rankine cycle

Otto cycle

Carnot cycle

Diesel cycle

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

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by camshaft

Belt driven by crankshaft

18. Bead wires are made of

Copper

Steel

Zinc

Aluminium

19. The Diesel engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

20. Cushioning springs in clutch plate reduces

None of these

Vehicle speed

Jerky starts

Torsional vibrations

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

Operates the clutch

Meshes the gears

Selects the synchronizer

Moves the synchronizer

22. Odometer is an instrument used for measurement of

Fuel consumption

Distance

Engine r.p.m.

Power

23. 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

Gravity

Splashing action of the crankshaft

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

Maintain directional control

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

Prevent uneven tyre wear

Compensate for wear in the steering linkage

25. Tachometer in a vehicle measures

Fuel consumption

Distance

Speed

Engine r.p.m.

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

Converts mechanical energy into electrical energy

Continually recharges the battery

Partly converts engine power into electric power

Supply electric power

27. Which of the following oil is more viscous?

SAE 40

SAE 80

SAE 30

SAE 70

28. 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

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

Big end

Small end

Journal

Crank arm

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

14

175

65

82

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31. The brake pedal during ABS operation

All of the above

Is pushed upward forcefully

Pedal stroke becomes longer

Transmits slight kickback to the driver's foot

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

Improved power output

Improved emission

All of these

Improved fuel efficiency

33. 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; 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.

The differential carrier houses differential pinion gears and side gears.

34. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maximise the fuel economy

Maintain constant engine speed

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

1.82

2.81

1.28

1.00

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

Rotate the tyres

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

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

20%

15%

5%

10%

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

Overheating of the engine

Incomplete valve closure

Fouling of spark plug by gasoline

None of these

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

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

40. 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

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41. 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

42. The parking brake generally acts on

Front and rear wheels

Rear wheels

Front wheels

Propeller shaft

43. 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/2

P.L.A.N/4

P.L.A.N

44. The fuel that detonates easily, is

Benzene

Iso-octane

Alcohol

N-heptane

45. The valve tappet clearance is measured by

Feeler gauge

Vernier caliper

Screw pitch gauge

Engineering scale

Automobile Engineering Practice Set-6

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