Automobile Engineering Practice Set-7

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

Using catalytic converter

None of these

Using some additives in the fuel

Recirculating exhaust

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

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

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

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

Piston pin

Cap roller bearing

Cap bolt

Rod cap

4. 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

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

All of the above

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

Rocker arms

Pistons

Valve stems

Camshaft pulley

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

Central hub

Clutch pedal

Cushion springs

Coil springs known as torsional springs

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

Four

One

Eight

Two

8. The parking brakes employed in vehicles are operated

None of these

Hydraulically

Mechanically

Pneumatically

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

Spray atomized fuel in the cylinder

Ignite the air-fuel mixture

Provide flame front for ignition

Mix the fuel and air

10. Two general types of tyres are

Air and pneumatic

Tube type and tubeless

Solid and tubeless

Split rim and drop centre

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11. 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

Creates a standing wave

Makes large noise when its heavy point hits the road surface

12. Clutch facings are usually attached to the plate by

Aluminium screws

Brass rivets

Steel rivets

Steel screws

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

Crankshaft

Oil pan

Cylinder block

Cylinder head

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

Compression ratio

Specific air consumption

Mean effective pressure

Brake power

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

All of these

Less chances of running flat

Slow air leakage

Better fuel efficiency

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

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

35°C

Ambient temperature

25°C

20°C

18. 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

Compression ring and aids the top ring in sealing and cooling

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

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

Positive caster

Positive camber

Negative caster

Negative camber

20. 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.

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

Piston crown

Piston skirt

Piston pin boss

Connecting rod

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

10:1

15:1

17:1

13:1

23. Petrol that detonates easily is called

Blended fuel

Unleaded petrol

High octane petrol

Low octane petrol

24. The function of oil control rings is that it

Keeps the cylinder wall lubricated by holding oil in its channel

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

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

None of these

Frictional power

Brake power

Indicated power

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

None of these

Corners

Edges

Centre

27. The correct flow of power through the drive train is

Engine main shaft, counter shaft, clutch, 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

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

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

Strength and less end thrust

Strength and cost

Noise level and economy

Noise level and strength

29. Damper in an automobile is used to

Release the energy

Absorb the energy

Increase the energy

Dissipate the energy

30. The calorific value of Diesel is about

36.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

42.5 MJ/kg

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31. The cam shaft in an engine is always mounted

Inclined to the crankshaft

None of these

Parallel to the crankshaft

Perpendicular to the crankshaft

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

Be doubled

Decrease

Remain constant

Increase

33. The basic function of the suspension is to

Automatically correct the effects of over steering

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

34. 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

35. The seat belt tensioners are built in the

Front seats

Seat belt retractors

Shoulder anchors

Seat belt buckles

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

45°

90°

130°

60°

37. The purpose of transmission in an automobile is

None of these

To vary the speed of automobile

To vary the torque at the wheels

To vary the power of automobile

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

Lower bracket

Upper bracket

Tilt bracket

Steering yoke joint

39. One effect of detonation is

Delay in ignition

Loss of power

Overheating of engine

Overcooling of engine

40. 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

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

25 bar

35 bar

45 bar

15 bar

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

Lubricating oil

Engine piston

Jacket cooling water

Engine cylinder

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

Brakes function more effectively

Brakes fail completely

Vapour locking has no effect on brake performance

Brake operation is delayed after depression of the brake pedal

Automobile Engineering Practice Set-7

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