Automobile Engineering Practice Set-7

Page 1 of 5

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

One

Eight

Two

Four

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

Rocker arms

Camshaft pulley

Valve stems

Pistons

3. Petrol that detonates easily is called

Blended fuel

Low octane petrol

High octane petrol

Unleaded petrol

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

Provide flame front for ignition

Mix the fuel and air

Spray atomized fuel in the cylinder

Ignite the air-fuel mixture

5. The calorific value of Diesel is about

42.5 MJ/kg

36.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

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

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

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

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

Better fuel efficiency

Slow air leakage

Less chances of running flat

All of these

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

Brake power

Frictional power

Indicated power

None of these

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

None of these

Using some additives in the fuel

Recirculating exhaust

Using catalytic converter

10. Two general types of tyres are

Tube type and tubeless

Air and pneumatic

Solid and tubeless

Split rim and drop centre

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

Lubricating oil

Engine cylinder

Jacket cooling water

Engine piston

12. 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

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

Cap bolt

Piston pin

Rod cap

Cap roller bearing

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

Be doubled

Decrease

Remain constant

Increase

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

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

None of the above

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

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

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

Coil springs known as torsional springs

Central hub

Clutch pedal

Cushion springs

17. 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

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

4

8

6

2

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

25°C

20°C

35°C

Ambient temperature

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

Uses chemical action to provide electricity

Has curved plates instead of flat plates

Does not use an electrolyte

Makes chemicals by mechanical means

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21. An imbalance wheel during vehicle operation

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

Creates a standing wave

22. 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

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

Steering yoke joint

Lower bracket

Upper bracket

Tilt bracket

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

Brakes fail completely

Vapour locking has no effect on brake performance

Brakes function more effectively

Brake operation is delayed after depression of the brake pedal

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

Positive caster

Positive camber

Negative caster

Negative camber

26. The parking brakes employed in vehicles are operated

Hydraulically

Pneumatically

None of these

Mechanically

27. The seat belt tensioners are built in the

Seat belt retractors

Front seats

Shoulder anchors

Seat belt buckles

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

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

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

90°

130°

60°

45°

30. 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

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31. 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

32. 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

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

All of the above

33. Damper in an automobile is used to

Release the energy

Dissipate the energy

Absorb the energy

Increase the energy

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

17:1

10:1

15:1

13:1

35. The cam shaft in an engine is always mounted

Parallel to the crankshaft

None of these

Perpendicular to the crankshaft

Inclined to the crankshaft

36. One effect of detonation is

Overheating of engine

Overcooling of engine

Loss of power

Delay in ignition

37. 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

38. The function of oil control rings is that it

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

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

Keeps the cylinder wall lubricated by holding oil in its channel

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

None of these

Edges

Centre

Corners

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

Piston pin boss

Connecting rod

Piston skirt

Piston crown

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41. The basic function of the suspension is to

Automatically correct the effects of over steering

Ensure that wheel alignment is not disturbed during driving

Absorbs vibration and impact forces from the road surface

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

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

Mean effective pressure

Specific air consumption

Brake power

Compression ratio

43. Clutch facings are usually attached to the plate by

Aluminium screws

Steel screws

Brass rivets

Steel rivets

Automobile Engineering Practice Set-7

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