Automobile Engineering Practice Set-7

Page 1 of 5

1. 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.

None of the above

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.

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

35 bar

45 bar

15 bar

25 bar

3. The seat belt tensioners are built in the

Shoulder anchors

Seat belt retractors

Seat belt buckles

Front seats

4. 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

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

Cap bolt

Piston pin

Cap roller bearing

Rod cap

6. The function of a connecting rod is

To drive the drive plate

To turn the flywheel

To transmit motion of the piston to the crankshaft

To drive the fuel pump

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

Noise level and strength

Strength and less end thrust

Noise level and economy

Strength and cost

8. 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

Lubricates the cylinder wall by releasing oil from its hole

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

9. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

None of these

Parallel to the crankshaft

Inclined to the crankshaft

10. One effect of detonation is

Loss of power

Delay in ignition

Overcooling of engine

Overheating of engine

Page 2 of 5

11. 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

12. 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

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

Oil pan

Crankshaft

Cylinder block

Cylinder head

14. 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

15. 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 wheel alignment is not disturbed during driving

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

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

Edges

Centre

None of these

Corners

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

Be doubled

Increase

Decrease

Remain constant

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

20°C

35°C

Ambient temperature

25°C

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

Eight

Two

One

Four

20. Petrol that detonates easily is called

High octane petrol

Blended fuel

Low octane petrol

Unleaded petrol

Page 3 of 5

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

Upper bracket

Tilt bracket

Lower bracket

Steering yoke joint

22. 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

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

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

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

All of the above

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

All of these

Less chances of running flat

Better fuel efficiency

Slow air leakage

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

130°

60°

90°

45°

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

Vapour locking has no effect on brake performance

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

Brakes function more effectively

27. Damper in an automobile is used to

Release the energy

Dissipate the energy

Absorb the energy

Increase the energy

28. Clutch facings are usually attached to the plate by

Aluminium screws

Steel screws

Steel rivets

Brass rivets

29. Two general types of tyres are

Solid and tubeless

Split rim and drop centre

Tube type and tubeless

Air and pneumatic

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

Pistons

Valve stems

Camshaft pulley

Rocker arms

Page 4 of 5

31. The advantage of having a tandem master cylinder arrangement in automobiles is that it

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

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

32. The calorific value of Diesel is about

36.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

42.5 MJ/kg

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

Uses chemical action to provide electricity

Makes chemicals by mechanical means

Does not use an electrolyte

Has curved plates instead of flat plates

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

Negative caster

Negative camber

Positive caster

Positive camber

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

2

4

8

6

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

Specific air consumption

Compression ratio

Brake power

Mean effective pressure

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

Engine piston

Lubricating oil

Engine cylinder

Jacket cooling water

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

None of these

Using some additives in the fuel

Using catalytic converter

Recirculating exhaust

39. 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

40. The parking brakes employed in vehicles are operated

Mechanically

Hydraulically

Pneumatically

None of these

Page 5 of 5

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

Piston pin boss

Piston crown

Connecting rod

Piston skirt

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

Frictional power

None of these

Brake power

Indicated power

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

Central hub

Cushion springs

Clutch pedal

Coil springs known as torsional springs

Automobile Engineering Practice Set-7

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Automobile Engineering Practice Set-7

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection