Automobile Engineering Practice Set-7

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1. One effect of detonation is

Overcooling of engine

Overheating of engine

Loss of power

Delay in ignition

2. The function of oil control rings is that it

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

Lubricates the cylinder wall by releasing oil from its hole

Keeps the cylinder wall lubricated by holding oil in its channel

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

Pistons

Camshaft pulley

Rocker arms

Valve stems

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

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Provide flame front for ignition

Mix the fuel and air

5. The purpose of transmission in an automobile is

To vary the speed of automobile

To vary the power of automobile

To vary the torque at the wheels

None of these

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

Rod cap

Cap bolt

Piston pin

Cap roller bearing

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

Engine piston

Jacket cooling water

Engine cylinder

Lubricating oil

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

Piston crown

Piston skirt

Piston pin boss

Connecting rod

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

Uses chemical action to provide electricity

Does not use an electrolyte

Has curved plates instead of flat plates

Makes chemicals by mechanical means

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

Centre

Edges

Corners

None of these

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

90°

130°

60°

45°

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

6

8

4

2

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

Remain constant

Be doubled

Increase

Decrease

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

Frictional power

Brake power

None of these

Indicated power

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

One

Two

Eight

Four

16. An imbalance wheel during vehicle operation

Creates a standing wave

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)

Deflects in the vehicle's longitudinal direction

17. Clutch facings are usually attached to the plate by

Brass rivets

Aluminium screws

Steel screws

Steel rivets

18. 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 clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels

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

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

Lower bracket

Tilt bracket

Upper bracket

Steering yoke joint

20. The calorific value of Diesel is about

42.5 MJ/kg

36.5 MJ/kg

45.5 MJ/kg

38.5 MJ/kg

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

Crankshaft

Cylinder head

Oil pan

Cylinder block

22. 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

23. Two general types of tyres are

Tube type and tubeless

Solid and tubeless

Split rim and drop centre

Air and pneumatic

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

35 bar

45 bar

25 bar

15 bar

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

Cushion springs

Clutch pedal

Coil springs known as torsional springs

Central hub

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

Better fuel efficiency

Less chances of running flat

All of these

Slow air leakage

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

Positive camber

Negative camber

Positive caster

Negative caster

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

35°C

25°C

20°C

Ambient temperature

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

Mean effective pressure

Specific air consumption

Compression ratio

Brake power

30. Damper in an automobile is used to

Release the energy

Dissipate the energy

Increase the energy

Absorb the energy

Page 4 of 5

31. The function of a connecting rod is

To turn the flywheel

To drive the drive plate

To drive the fuel pump

To transmit motion of the piston to the crankshaft

32. The cam shaft in an engine is always mounted

Inclined to the crankshaft

Perpendicular to the crankshaft

Parallel to the crankshaft

None of these

33. 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 activating the brakes using vacuum pressure in the event of brake fluid loss

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

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

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

Strength and less end thrust

Noise level and strength

Noise level and economy

Strength and cost

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

Vapour locking has no effect on brake performance

Brakes fail completely

Brakes function more effectively

Brake operation is delayed after depression of the brake pedal

36. 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

Compression ring and aids the top ring in sealing and cooling

Cushion ring which prevents piston slap and knock

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

Recirculating exhaust

Using catalytic converter

None of these

Using some additives in the fuel

38. Petrol that detonates easily is called

Blended fuel

Unleaded petrol

High octane petrol

Low octane petrol

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

15:1

17:1

10:1

13:1

40. 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

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

All of the above

Air temperature ignites the fuel in the Diesel engine

Page 5 of 5

41. The parking brakes employed in vehicles are operated

Hydraulically

Pneumatically

None of these

Mechanically

42. The seat belt tensioners are built in the

Shoulder anchors

Seat belt buckles

Front seats

Seat belt retractors

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

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

None of the above

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.

Automobile Engineering Practice Set-7

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Automobile Engineering Practice Set-7

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