Automobile Engineering Practice Set-7

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

Mix the fuel and air

Ignite the air-fuel mixture

Provide flame front for ignition

Spray atomized fuel in the cylinder

2. 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

3. The cam shaft in an engine is always mounted

Parallel to the crankshaft

None of these

Perpendicular to the crankshaft

Inclined to the crankshaft

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

Uses chemical action to provide electricity

Does not use an electrolyte

Makes chemicals by mechanical means

Has curved plates instead of flat plates

5. The function of a connecting rod is

To drive the fuel pump

To turn the flywheel

To drive the drive plate

To transmit motion of the piston to the crankshaft

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

Steering yoke joint

Lower bracket

Tilt bracket

Upper bracket

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

Cushion springs

Central hub

Clutch pedal

Coil springs known as torsional springs

8. 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

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

Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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

Piston pin

Cap roller bearing

Rod cap

Cap bolt

10. The calorific value of Diesel is about

45.5 MJ/kg

42.5 MJ/kg

36.5 MJ/kg

38.5 MJ/kg

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11. The basic function of the suspension is to

Absorbs vibration and impact forces from the road surface

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

Automatically correct the effects of over steering

Ensure that wheel alignment is not disturbed during driving

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

All of these

Better fuel efficiency

Less chances of running flat

Slow air leakage

13. 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

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

Vapour locking has no effect on brake performance

Brake operation is delayed after depression of the brake pedal

Brakes fail completely

Brakes function more effectively

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

Piston pin boss

Connecting rod

Piston crown

Piston skirt

16. The function of oil control rings is that it

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

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

Lubricates the cylinder wall by releasing oil from its hole

17. Clutch facings are usually attached to the plate by

Aluminium screws

Steel screws

Steel rivets

Brass rivets

18. Two general types of tyres are

Solid and tubeless

Split rim and drop centre

Air and pneumatic

Tube type and tubeless

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

Lubricating oil

Engine piston

Jacket cooling water

Engine cylinder

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

Specific air consumption

Brake power

Mean effective pressure

Compression ratio

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

45 bar

35 bar

25 bar

15 bar

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

15:1

13:1

10:1

17:1

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

Using catalytic converter

Using some additives in the fuel

Recirculating exhaust

None of these

24. The seat belt tensioners are built in the

Shoulder anchors

Seat belt retractors

Front seats

Seat belt buckles

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

Two

Eight

Four

One

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

Ambient temperature

25°C

20°C

35°C

27. The parking brakes employed in vehicles are operated

Mechanically

Pneumatically

None of these

Hydraulically

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

Remain constant

Be doubled

Increase

Decrease

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

None of these

Frictional power

Indicated power

Brake power

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

Air temperature ignites the fuel in the Diesel engine

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

All of the above

Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

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

Edges

Centre

Corners

None of these

32. The purpose of transmission in an automobile is

To vary the power of automobile

To vary the speed of automobile

None of these

To vary the torque at the wheels

33. An imbalance wheel during vehicle operation

Deflects in the vehicle's longitudinal direction

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

Creates a standing wave

Makes large noise when its heavy point hits the road surface

34. Damper in an automobile is used to

Absorb the energy

Release the energy

Increase the energy

Dissipate the energy

35. Petrol that detonates easily is called

Unleaded petrol

Low octane petrol

High octane petrol

Blended fuel

36. 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

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

Compression ring and aids the top ring in sealing and cooling

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

Valve stems

Rocker arms

Camshaft pulley

Pistons

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

Strength and cost

Noise level and strength

Noise level and economy

Strength and less end thrust

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

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

45°

60°

90°

130°

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

Negative caster

Positive caster

Negative camber

Positive camber

42. One effect of detonation is

Overheating of engine

Overcooling of engine

Loss of power

Delay in ignition

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

None of the above

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

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.

Automobile Engineering Practice Set-7

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