Automobile Engineering Practice Set-7

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1. 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

2. 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

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

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

3. 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

Keeps the cylinder wall lubricated by holding oil in its channel

Lubricates the cylinder wall by releasing oil from its hole

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

Less chances of running flat

All of these

Better fuel efficiency

Slow air leakage

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

Cylinder head

Crankshaft

Oil pan

Cylinder block

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

One

Two

Eight

Four

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

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

Compression ring and aids the top ring in sealing and cooling

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

Lubricating oil

Jacket cooling water

Engine piston

Engine cylinder

9. The basic function of the suspension is to

Absorbs vibration and impact forces from the road surface

Automatically correct the effects of over steering

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

Ensure that wheel alignment is not disturbed during driving

10. The seat belt tensioners are built in the

Seat belt buckles

Shoulder anchors

Front seats

Seat belt retractors

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11. 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

12. Damper in an automobile is used to

Increase the energy

Dissipate the energy

Absorb the energy

Release the energy

13. The purpose of transmission in an automobile is

None of these

To vary the power of automobile

To vary the speed of automobile

To vary the torque at the wheels

14. 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

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

Tilt bracket

Upper bracket

Lower bracket

Steering yoke joint

16. Petrol that detonates easily is called

Blended fuel

Low octane petrol

High octane petrol

Unleaded petrol

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

18. 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

19. 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

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

17:1

10:1

13:1

15:1

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

Central hub

Cushion springs

Clutch pedal

Coil springs known as torsional springs

22. Two general types of tyres are

Split rim and drop centre

Tube type and tubeless

Air and pneumatic

Solid and tubeless

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

60°

130°

90°

45°

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

Decrease

Remain constant

Be doubled

Increase

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

Positive camber

Negative camber

Positive caster

Negative caster

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

Rocker arms

Camshaft pulley

Valve stems

Pistons

27. Clutch facings are usually attached to the plate by

Steel rivets

Aluminium screws

Steel screws

Brass rivets

28. An imbalance wheel during vehicle operation

Creates a standing wave

Deflects in the vehicle's longitudinal direction

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

Makes large noise when its heavy point hits the road surface

29. The parking brakes employed in vehicles are operated

None of these

Pneumatically

Mechanically

Hydraulically

30. 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

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

Connecting rod

Piston skirt

Piston pin boss

Piston crown

32. One effect of detonation is

Loss of power

Delay in ignition

Overcooling of engine

Overheating of engine

33. 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

All of the above

Air temperature ignites the fuel in the Diesel engine

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

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

25°C

35°C

Ambient temperature

20°C

35. The cam shaft in an engine is always mounted

Parallel to the crankshaft

Inclined to the crankshaft

Perpendicular to the crankshaft

None of these

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

Provide flame front for ignition

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Mix the fuel and air

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

Corners

Edges

None of these

Centre

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

Piston pin

Rod cap

Cap bolt

Cap roller bearing

39. The calorific value of Diesel is about

36.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

42.5 MJ/kg

40. 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

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

None of these

Indicated power

Brake power

Frictional power

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

Vapour locking has no effect on brake performance

Brakes function more effectively

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

43. The function of a connecting rod is

To drive the drive plate

To drive the fuel pump

To transmit motion of the piston to the crankshaft

To turn the flywheel

Automobile Engineering Practice Set-7

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