Automobile Engineering Practice Set-7

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

Mean effective pressure

Compression ratio

Specific air consumption

Brake power

2. The cam shaft in an engine is always mounted

Parallel to the crankshaft

Perpendicular to the crankshaft

None of these

Inclined to the crankshaft

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

Coil springs known as torsional springs

Clutch pedal

Central hub

Cushion springs

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

Two

Four

One

Eight

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

35 bar

25 bar

45 bar

15 bar

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

Oil pan

Cylinder head

Cylinder block

Crankshaft

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

Rod cap

Cap bolt

Cap roller bearing

Piston pin

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

None of these

Indicated power

Frictional power

Brake power

9. Two general types of tyres are

Solid and tubeless

Split rim and drop centre

Tube type and tubeless

Air and pneumatic

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

None of these

Centre

Corners

Edges

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

Noise level and strength

Noise level and economy

Strength and cost

Strength and less end thrust

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

Uses chemical action to provide electricity

Makes chemicals by mechanical means

Does not use an electrolyte

Has curved plates instead of flat plates

13. 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

Lubricates the cylinder wall by releasing oil from its hole

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

Keeps the cylinder wall lubricated by holding oil in its channel

14. 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

15. Petrol that detonates easily is called

Unleaded petrol

Blended fuel

Low octane petrol

High octane petrol

16. The calorific value of Diesel is about

38.5 MJ/kg

45.5 MJ/kg

36.5 MJ/kg

42.5 MJ/kg

17. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To drive the drive plate

To drive the fuel pump

To turn the flywheel

18. An imbalance wheel during vehicle operation

Deflects in the vehicle's longitudinal direction

Makes large noise when its heavy point hits the road surface

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

Creates a standing wave

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

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

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

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

2

6

4

8

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

Lubricating oil

Engine cylinder

Jacket cooling water

Engine piston

22. 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

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

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

23. Damper in an automobile is used to

Dissipate the energy

Release the energy

Absorb the energy

Increase the energy

24. The parking brakes employed in vehicles are operated

None of these

Hydraulically

Mechanically

Pneumatically

25. One effect of detonation is

Delay in ignition

Overcooling of engine

Overheating of engine

Loss of power

26. The seat belt tensioners are built in the

Shoulder anchors

Seat belt buckles

Seat belt retractors

Front seats

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

Less chances of running flat

Slow air leakage

All of these

Better fuel efficiency

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

Be doubled

Remain constant

Increase

Decrease

29. Clutch facings are usually attached to the plate by

Steel rivets

Brass rivets

Aluminium screws

Steel screws

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

Lower bracket

Steering yoke joint

Upper bracket

Tilt bracket

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

Brakes function more effectively

Brake operation is delayed after depression of the brake pedal

Vapour locking has no effect on brake performance

Brakes fail completely

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

Rocker arms

Valve stems

Pistons

Camshaft pulley

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

130°

45°

60°

90°

34. 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

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

Piston skirt

Connecting rod

Piston crown

Piston pin boss

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

20°C

35°C

25°C

Ambient temperature

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

Recirculating exhaust

Using some additives in the fuel

Using catalytic converter

None of these

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

15:1

10:1

17:1

13:1

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

Mix the fuel and air

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Provide flame front for ignition

40. The basic function of the suspension is to

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

Automatically correct the effects of over steering

Absorbs vibration and impact forces from the road surface

Ensure that wheel alignment is not disturbed during driving

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41. The purpose of transmission in an automobile is

None of these

To vary the speed of automobile

To vary the torque at the wheels

To vary the power of automobile

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

Positive caster

Negative caster

Positive camber

Negative camber

43. 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

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

Cushion ring which prevents piston slap and knock

Compression ring and aids the top ring in sealing and cooling

Automobile Engineering Practice Set-7

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Automobile Engineering Practice Set-7

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