Automobile Engineering Practice Set-7

Page 1 of 5

1. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

None of these

Parallel to the crankshaft

Inclined to the crankshaft

2. Damper in an automobile is used to

Dissipate the energy

Increase the energy

Release the energy

Absorb the energy

3. One effect of detonation is

Loss of power

Delay in ignition

Overcooling of engine

Overheating of engine

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

Four

Eight

Two

One

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

35 bar

15 bar

45 bar

25 bar

6. 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

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 parking brakes employed in vehicles are operated

Pneumatically

None of these

Mechanically

Hydraulically

8. 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.

None of the above

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

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

15:1

13:1

17:1

10:1

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

Cap bolt

Piston pin

Cap roller bearing

Rod cap

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11. The purpose of transmission in an automobile is

None of these

To vary the speed of automobile

To vary the power of automobile

To vary the torque at the wheels

12. The seat belt tensioners are built in the

Front seats

Seat belt buckles

Shoulder anchors

Seat belt retractors

13. Petrol that detonates easily is called

High octane petrol

Low octane petrol

Unleaded petrol

Blended fuel

14. 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

Brakes fail completely

Vapour locking has no effect on brake performance

15. Clutch facings are usually attached to the plate by

Steel screws

Brass rivets

Aluminium screws

Steel rivets

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

Connecting rod

Piston pin boss

Piston crown

Piston skirt

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

Corners

Centre

Edges

None of these

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

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

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

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

Engine cylinder

Lubricating oil

Jacket cooling water

Engine piston

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

Ambient temperature

25°C

20°C

35°C

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21. The function of a connecting rod is

To drive the fuel pump

To drive the drive plate

To transmit motion of the piston to the crankshaft

To turn the flywheel

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

All of the above

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

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

Negative camber

Positive camber

Positive caster

Negative caster

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

Decrease

Remain constant

Be doubled

Increase

25. The calorific value of Diesel is about

42.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

36.5 MJ/kg

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

Valve stems

Camshaft pulley

Pistons

Rocker arms

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

None of these

Frictional power

Brake power

Indicated power

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

60°

45°

90°

130°

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

Oil pan

Crankshaft

Cylinder head

Cylinder block

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

Noise level and strength

Strength and cost

Strength and less end thrust

Noise level and economy

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31. 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

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

Using some additives in the fuel

Using catalytic converter

None of these

Recirculating exhaust

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

Tilt bracket

Upper bracket

Lower bracket

Steering yoke joint

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

Does not use an electrolyte

Makes chemicals by mechanical means

Uses chemical action to provide electricity

Has curved plates instead of flat plates

35. The basic function of the suspension is to

Ensure that wheel alignment is not disturbed during driving

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

Absorbs vibration and impact forces from the road surface

Automatically correct the effects of over steering

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

Coil springs known as torsional springs

Cushion springs

Clutch pedal

Central hub

37. Two general types of tyres are

Tube type and tubeless

Solid and tubeless

Split rim and drop centre

Air and pneumatic

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

6

8

2

4

39. 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

40. 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

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41. The function of oil control rings is that it

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

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

Keeps the cylinder wall lubricated by holding oil in its channel

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. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

Deflects in the vehicle's longitudinal direction

Creates a standing wave

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

Automobile Engineering Practice Set-7

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Automobile Engineering Practice Set-7

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