Automobile Engineering Practice Set-7

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1. The effect of vapour locking on the brake performance is that the

Brake operation is delayed after depression of the brake pedal

Vapour locking has no effect on brake performance

Brakes fail completely

Brakes function more effectively

2. The temperature indicating instrument in vehicles indicates the temperature of

Engine cylinder

Engine piston

Lubricating oil

Jacket cooling water

3. The most effective method of controlling S.I. engine exhaust emission is by

None of these

Recirculating exhaust

Using catalytic converter

Using some additives in the fuel

4. The parking brakes employed in vehicles are operated

Mechanically

Hydraulically

None of these

Pneumatically

5. When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate

Specific air consumption

Brake power

Compression ratio

Mean effective pressure

6. The seat belt tensioners are built in the

Shoulder anchors

Front seats

Seat belt buckles

Seat belt retractors

7. The purpose of transmission in an automobile is

To vary the torque at the wheels

To vary the power of automobile

To vary the speed of automobile

None of these

8. An imbalance wheel during vehicle operation

Creates a standing wave

Bounces vertically or deflects from side to side (as seen from front or rear)

Deflects in the vehicle's longitudinal direction

Makes large noise when its heavy point hits the road surface

9. How many cells are used in a 12 volt car battery?

2

8

4

6

10. The function of a connecting rod is

To drive the drive plate

To turn the flywheel

To drive the fuel pump

To transmit motion of the piston to the crankshaft

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11. The correct flow of power through the drive train is

Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels

Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels

Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels

Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels

12. The motion of the cam is transferred to the valves through

Valve stems

Rocker arms

Camshaft pulley

Pistons

13. In a Diesel engine, the function of a fuel injector is to

Ignite the air-fuel mixture

Provide flame front for ignition

Mix the fuel and air

Spray atomized fuel in the cylinder

14. Two general types of tyres are

Split rim and drop centre

Tube type and tubeless

Solid and tubeless

Air and pneumatic

15. A basic difference between the spark ignition engine and the Diesel engine is that the

All of the above

Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

Air temperature ignites the fuel in the Diesel engine

Diesel engine compresses air alone instead of an air-fuel mixture

16. The number of exhaust manifolds in a V6 engine is

One

Four

Eight

Two

17. The basic part of the engine, to which the other engine parts are attached or assembled is the

Crankshaft

Oil pan

Cylinder block

Cylinder head

18. The temperature at which tyre inflation pressure should be checked is

20°C

Ambient temperature

35°C

25°C

19. In a single dry plate clutch, torsional vibrations are absorbed by

Central hub

Coil springs known as torsional springs

Clutch pedal

Cushion springs

20. One effect of detonation is

Overcooling of engine

Loss of power

Delay in ignition

Overheating of engine

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21. The advantage of a tubeless tyre over tube type tyre is

Less chances of running flat

All of these

Better fuel efficiency

Slow air leakage

22. In case of a Diesel car, the pressure at the end of compression is of the order of

35 bar

25 bar

15 bar

45 bar

23. Clutch facings are usually attached to the plate by

Aluminium screws

Brass rivets

Steel rivets

Steel screws

24. If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

17:1

13:1

15:1

10:1

25. The lower cylindrical portion of the piston which improves piston cooling performance is called

Connecting rod

Piston crown

Piston pin boss

Piston skirt

26. Damper in an automobile is used to

Dissipate the energy

Increase the energy

Release the energy

Absorb the energy

27. In vehicles with tilt steering, the steering column is pivoted in

Tilt bracket

Lower bracket

Steering yoke joint

Upper bracket

28. When the top of the wheel is tilted outward, then it is called

Positive camber

Negative camber

Positive caster

Negative caster

29. Petrol that detonates easily is called

High octane petrol

Unleaded petrol

Blended fuel

Low octane petrol

30. If clearance volume of I.C. engines is increased, the compression ratio will

Decrease

Be doubled

Remain constant

Increase

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31. The battery is an electrochemical device, which means battery

Does not use an electrolyte

Has curved plates instead of flat plates

Makes chemicals by mechanical means

Uses chemical action to provide electricity

32. Two advantages of using helical gears rather than spur gears in a transmission system are

Strength and cost

Strength and less end thrust

Noise level and strength

Noise level and economy

33. The power actually developed inside the engine cylinder is called as

None of these

Indicated power

Brake power

Frictional power

34. The connecting rod is attached to the piston by the

Piston pin

Cap roller bearing

Cap bolt

Rod cap

35. The calorific value of Diesel is about

38.5 MJ/kg

36.5 MJ/kg

45.5 MJ/kg

42.5 MJ/kg

36. The two rows of cylinders in a 'V' type engine are generally arranged at

90°

60°

45°

130°

37. The function of a second ring is that it is a

Back up compression ring which will work in place of the top ring when it is broken

Cushion ring which prevents piston slap and knock

Back up oil control ring which will work in place of the bottom ring when it is broken

Compression ring and aids the top ring in sealing and cooling

38. The advantage of having a tandem master cylinder arrangement in automobiles is that it

Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side

Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss

Enhances safety by serving two independent lines in a divided line brake circuit

39. In a four speed four stroke Diesel engine, the intake valve

Opens at T.D.C. and closes at B.D.C.

Opens at 20° before T.D.C. and closes at 35° after B.D.C.

Opens at 10° after T.D.C. and closes at 20° before B.D.C.

None of the above

40. The basic function of the suspension is to

Absorbs vibration and impact forces from the road surface

Ensure that wheel alignment is not disturbed during driving

Ensure that the steering wheel can deliver a suitable amount of steering force

Automatically correct the effects of over steering

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41. The cam shaft in an engine is always mounted

None of these

Perpendicular to the crankshaft

Parallel to the crankshaft

Inclined to the crankshaft

42. An overinflated tyre will wear the tread most near the

Centre

Edges

None of these

Corners

43. The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole

Keeps the cylinder wall lubricated by holding oil in its channel

Maintains a seal and prevents escape of burned gases and oil leakage

Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan

Automobile Engineering Practice Set-7

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Automobile Engineering Practice Set-7

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