Automobile Engineering Practice Set-7

Page 1 of 5

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

Centre

None of these

Corners

Edges

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

Cushion ring which prevents piston slap and knock

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

Compression ring and aids the top ring in sealing and cooling

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

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

Negative caster

Negative camber

Positive camber

Positive caster

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

35°C

Ambient temperature

20°C

25°C

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

Mean effective pressure

Brake power

Specific air consumption

Compression ratio

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

Clutch pedal

Central hub

Coil springs known as torsional springs

Cushion springs

7. The purpose of transmission in an automobile is

To vary the torque at the wheels

None of these

To vary the speed of automobile

To vary the power of automobile

8. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To drive the drive plate

To turn the flywheel

To drive the fuel pump

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

15 bar

35 bar

45 bar

25 bar

10. The seat belt tensioners are built in the

Seat belt retractors

Front seats

Shoulder anchors

Seat belt buckles

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11. Clutch facings are usually attached to the plate by

Aluminium screws

Steel screws

Steel rivets

Brass rivets

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

13:1

17:1

10:1

15:1

13. Damper in an automobile is used to

Release the energy

Increase the energy

Absorb the energy

Dissipate the energy

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

Cap roller bearing

Piston pin

Cap bolt

Rod cap

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

Four

Two

Eight

One

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

6

4

8

2

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

Connecting rod

Piston skirt

Piston pin boss

Piston crown

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

Recirculating exhaust

Using catalytic converter

Using some additives in the fuel

None of these

19. The basic function of the suspension is to

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

Ensure that wheel alignment is not disturbed during driving

Automatically correct the effects of over steering

Absorbs vibration and impact forces from the road surface

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

Has curved plates instead of flat plates

Uses chemical action to provide electricity

Does not use an electrolyte

Makes chemicals by mechanical means

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

Strength and less end thrust

Noise level and economy

Noise level and strength

Strength and cost

22. The calorific value of Diesel is about

38.5 MJ/kg

42.5 MJ/kg

36.5 MJ/kg

45.5 MJ/kg

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

90°

130°

45°

60°

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

Steering yoke joint

Upper bracket

Lower bracket

Tilt bracket

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

Cylinder block

Oil pan

Cylinder head

Crankshaft

26. Petrol that detonates easily is called

Unleaded petrol

Low octane petrol

Blended fuel

High octane petrol

27. The cam shaft in an engine is always mounted

Parallel to the crankshaft

None of these

Perpendicular to the crankshaft

Inclined to the crankshaft

28. One effect of detonation is

Overcooling of engine

Delay in ignition

Overheating of engine

Loss of power

29. 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

30. The function of oil control rings is that it

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

Keeps the cylinder wall lubricated by holding oil in its channel

Lubricates the cylinder wall by releasing oil from its hole

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

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

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

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

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

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

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

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

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

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

33. The parking brakes employed in vehicles are operated

None of these

Pneumatically

Hydraulically

Mechanically

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

Brake power

None of these

Frictional power

Indicated power

35. Two general types of tyres are

Solid and tubeless

Tube type and tubeless

Split rim and drop centre

Air and pneumatic

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

All of these

Slow air leakage

Better fuel efficiency

Less chances of running flat

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

Jacket cooling water

Engine piston

Engine cylinder

Lubricating oil

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

Rocker arms

Pistons

Camshaft pulley

Valve stems

39. An imbalance wheel during vehicle operation

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

Makes large noise when its heavy point hits the road surface

Creates a standing wave

Deflects in the vehicle's longitudinal direction

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

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

Air temperature ignites the fuel in the Diesel engine

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

All of the above

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

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

Vapour locking has no effect on brake performance

Brakes function more effectively

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

Decrease

Be doubled

Increase

Remain constant

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

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

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

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

None of the above

Automobile Engineering Practice Set-7

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