Automobile Engineering Practice Set-7

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1. 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

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

Cap bolt

Piston pin

Cap roller bearing

Rod cap

3. Two general types of tyres are

Air and pneumatic

Solid and tubeless

Tube type and tubeless

Split rim and drop centre

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

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

Cushion ring which prevents piston slap and knock

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

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

6. 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

7. Clutch facings are usually attached to the plate by

Aluminium screws

Brass rivets

Steel rivets

Steel screws

8. The function of a connecting rod is

To drive the fuel pump

To turn the flywheel

To transmit motion of the piston to the crankshaft

To drive the drive plate

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

Eight

Two

One

Four

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

45°

130°

60°

90°

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11. Damper in an automobile is used to

Absorb the energy

Increase the energy

Dissipate the energy

Release the energy

12. One effect of detonation is

Loss of power

Overcooling of engine

Overheating of engine

Delay in ignition

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

20°C

Ambient temperature

35°C

25°C

14. The parking brakes employed in vehicles are operated

Hydraulically

Pneumatically

Mechanically

None of these

15. 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

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

Mean effective pressure

Brake power

Specific air consumption

Compression ratio

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

Camshaft pulley

Valve stems

Rocker arms

Pistons

18. The purpose of transmission in an automobile is

To vary the power of automobile

To vary the torque at the wheels

To vary the speed of automobile

None of these

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

None of the above

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.

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

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

None of these

Edges

Centre

Corners

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

Indicated power

Frictional power

Brake power

None of these

22. The seat belt tensioners are built in the

Seat belt retractors

Seat belt buckles

Shoulder anchors

Front seats

23. The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole

Keeps the cylinder wall lubricated by holding oil in its channel

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

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

Mix the fuel and air

Provide flame front for ignition

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

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

Remain constant

Be doubled

Decrease

Increase

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

Cushion springs

Clutch pedal

Central hub

Coil springs known as torsional springs

27. 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

28. The calorific value of Diesel is about

36.5 MJ/kg

45.5 MJ/kg

38.5 MJ/kg

42.5 MJ/kg

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

Steering yoke joint

Lower bracket

Upper bracket

Tilt bracket

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

Using some additives in the fuel

Recirculating exhaust

None of these

Using catalytic converter

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

Has curved plates instead of flat plates

Does not use an electrolyte

Makes chemicals by mechanical means

Uses chemical action to provide electricity

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

15:1

10:1

13:1

17:1

33. 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

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

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

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

Engine piston

Jacket cooling water

Engine cylinder

Lubricating oil

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

Crankshaft

Cylinder block

Oil pan

Cylinder head

36. An imbalance wheel during vehicle operation

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

Makes large noise when its heavy point hits the road surface

37. Petrol that detonates easily is called

Low octane petrol

High octane petrol

Blended fuel

Unleaded petrol

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

Better fuel efficiency

Slow air leakage

All of these

Less chances of running flat

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

Positive camber

Negative camber

Negative caster

Positive caster

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

Connecting rod

Piston crown

Piston skirt

Piston pin boss

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41. The cam shaft in an engine is always mounted

Inclined to the crankshaft

Parallel to the crankshaft

None of these

Perpendicular to the crankshaft

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

Noise level and economy

Strength and cost

Noise level and strength

Strength and less end thrust

43. The basic function of the suspension is to

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

Automatically correct the effects of over steering

Automobile Engineering Practice Set-7

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