Automobile Engineering Practice Set-7

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

Central hub

Cushion springs

Clutch pedal

Coil springs known as torsional springs

2. The basic function of the suspension is to

Automatically correct the effects of over steering

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

Absorbs vibration and impact forces from the road surface

Ensure that wheel alignment is not disturbed during driving

3. The function of a connecting rod is

To turn the flywheel

To transmit motion of the piston to the crankshaft

To drive the fuel pump

To drive the drive plate

4. The purpose of transmission in an automobile is

To vary the speed of automobile

To vary the torque at the wheels

To vary the power of automobile

None of these

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

None of these

Edges

Centre

Corners

6. 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

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

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

7. 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

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

8. The seat belt tensioners are built in the

Seat belt buckles

Front seats

Shoulder anchors

Seat belt retractors

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

Strength and less end thrust

Strength and cost

Noise level and economy

Noise level and strength

10. The function of oil control rings is that it

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

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

Lubricates the cylinder wall by releasing oil from its hole

Keeps the cylinder wall lubricated by holding oil in its channel

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

45°

60°

130°

90°

12. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Parallel to the crankshaft

Inclined to the crankshaft

None of these

13. Two general types of tyres are

Air and pneumatic

Solid and tubeless

Split rim and drop centre

Tube type and tubeless

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

Spray atomized fuel in the cylinder

Ignite the air-fuel mixture

Mix the fuel and air

Provide flame front for ignition

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

Vapour locking has no effect on brake performance

Brake operation is delayed after depression of the brake pedal

Brakes function more effectively

Brakes fail completely

16. The calorific value of Diesel is about

42.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

36.5 MJ/kg

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

15 bar

35 bar

25 bar

45 bar

18. The parking brakes employed in vehicles are operated

Mechanically

Hydraulically

Pneumatically

None of these

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

Eight

Two

Four

One

20. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

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

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

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

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

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

Uses chemical action to provide electricity

Does not use an electrolyte

Makes chemicals by mechanical means

Has curved plates instead of flat plates

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

Pistons

Rocker arms

Valve stems

Camshaft pulley

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

Piston pin boss

Connecting rod

Piston skirt

Piston crown

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

Lubricating oil

Engine cylinder

Engine piston

Jacket cooling water

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

Cap roller bearing

Piston pin

Rod cap

Cap bolt

27. One effect of detonation is

Loss of power

Delay in ignition

Overheating of engine

Overcooling of engine

28. Petrol that detonates easily is called

Blended fuel

High octane petrol

Unleaded petrol

Low octane petrol

29. Clutch facings are usually attached to the plate by

Brass rivets

Steel rivets

Aluminium screws

Steel screws

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

Positive caster

Positive camber

Negative caster

Negative camber

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

15:1

13:1

10:1

17:1

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

Recirculating exhaust

None of these

Using catalytic converter

Using some additives in the fuel

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

Ambient temperature

25°C

35°C

20°C

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

Steering yoke joint

Lower bracket

Upper bracket

Tilt bracket

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

Cylinder head

Oil pan

Cylinder block

Crankshaft

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

Brake power

None of these

Frictional power

Indicated power

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

Be doubled

Decrease

Increase

Remain constant

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

Brake power

Compression ratio

Mean effective pressure

Specific air consumption

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

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

None of the above

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.

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

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

All of the above

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

42. 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

43. Damper in an automobile is used to

Absorb the energy

Dissipate the energy

Increase the energy

Release the energy

Automobile Engineering Practice Set-7

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