Automobile Engineering Practice Set-7

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

Piston pin boss

Connecting rod

Piston skirt

Piston crown

2. The calorific value of Diesel is about

42.5 MJ/kg

36.5 MJ/kg

38.5 MJ/kg

45.5 MJ/kg

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

Brake power

Specific air consumption

Mean effective pressure

Compression ratio

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

Rod cap

Piston pin

Cap roller bearing

Cap bolt

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

Steering yoke joint

Lower bracket

Tilt bracket

Upper bracket

6. 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 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

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

7. The cam shaft in an engine is always mounted

None of these

Inclined to the crankshaft

Parallel to the crankshaft

Perpendicular to the crankshaft

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

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

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

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

None of these

Edges

Corners

Centre

10. One effect of detonation is

Overcooling of engine

Delay in ignition

Overheating of engine

Loss of power

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11. Petrol that detonates easily is called

Unleaded petrol

Blended fuel

Low octane petrol

High octane petrol

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

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.

None of the above

13. The seat belt tensioners are built in the

Seat belt retractors

Seat belt buckles

Shoulder anchors

Front seats

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

Valve stems

Rocker arms

Camshaft pulley

Pistons

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

Brake operation is delayed after depression of the brake pedal

Brakes fail completely

Vapour locking has no effect on brake performance

Brakes function more effectively

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

Compression ring and aids the top ring in sealing and cooling

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

Cushion ring which prevents piston slap and knock

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

Clutch pedal

Coil springs known as torsional springs

Cushion springs

Central hub

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

Better fuel efficiency

Less chances of running flat

Slow air leakage

All of these

19. The parking brakes employed in vehicles are operated

Mechanically

Hydraulically

Pneumatically

None of these

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

Increase

Decrease

Remain constant

Be doubled

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

Cylinder head

Oil pan

Crankshaft

Cylinder block

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

None of these

Using catalytic converter

Using some additives in the fuel

Recirculating exhaust

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

60°

90°

130°

45°

24. The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole

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

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

25. The purpose of transmission in an automobile is

To vary the power of automobile

To vary the torque at the wheels

None of these

To vary the speed of automobile

26. Clutch facings are usually attached to the plate by

Aluminium screws

Steel screws

Brass rivets

Steel rivets

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

One

Eight

Four

Two

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

Negative caster

Positive camber

Negative camber

Positive caster

29. 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

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

Does not use an electrolyte

Has curved plates instead of flat plates

Uses chemical action to provide electricity

Makes chemicals by mechanical means

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

Ambient temperature

35°C

20°C

25°C

32. Two general types of tyres are

Air and pneumatic

Solid and tubeless

Split rim and drop centre

Tube type and tubeless

33. The function of a connecting rod is

To drive the drive plate

To transmit motion of the piston to the crankshaft

To drive the fuel pump

To turn the flywheel

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

Indicated power

Frictional power

None of these

Brake power

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

25 bar

35 bar

15 bar

45 bar

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

Strength and cost

Strength and less end thrust

Noise level and strength

Noise level and economy

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

Mix the fuel and air

Spray atomized fuel in the cylinder

Ignite the air-fuel mixture

Provide flame front for ignition

38. The basic function of the suspension is to

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

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

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

8

6

2

4

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

Engine piston

Lubricating oil

Jacket cooling water

Engine cylinder

42. Damper in an automobile is used to

Dissipate the energy

Increase the energy

Release the energy

Absorb the energy

43. 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

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

All of the above

Air temperature ignites the fuel in the Diesel engine

Automobile Engineering Practice Set-7

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