Automobile Engineering Practice Set-7

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

Noise level and economy

Strength and less end thrust

Strength and cost

Noise level and strength

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

Piston pin boss

Connecting rod

Piston skirt

Piston crown

3. The parking brakes employed in vehicles are operated

None of these

Mechanically

Hydraulically

Pneumatically

4. 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.

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

None of these

Edges

Corners

Centre

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

Cylinder head

Oil pan

Cylinder block

Crankshaft

7. The calorific value of Diesel is about

45.5 MJ/kg

42.5 MJ/kg

38.5 MJ/kg

36.5 MJ/kg

8. Clutch facings are usually attached to the plate by

Steel rivets

Aluminium screws

Brass rivets

Steel screws

9. 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

10. The purpose of transmission in an automobile is

To vary the speed of automobile

To vary the power of automobile

To vary the torque at the wheels

None of these

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11. Petrol that detonates easily is called

Blended fuel

Low octane petrol

Unleaded petrol

High octane petrol

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

Brakes fail completely

Brakes function more effectively

Vapour locking has no effect on brake performance

Brake operation is delayed after depression of the brake pedal

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

25 bar

45 bar

15 bar

35 bar

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

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

Pistons

Camshaft pulley

Rocker arms

Valve stems

16. One effect of detonation is

Overcooling of engine

Overheating of engine

Loss of power

Delay in ignition

17. 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

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

18. 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

19. Two general types of tyres are

Air and pneumatic

Split rim and drop centre

Tube type and tubeless

Solid and tubeless

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

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

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

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

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

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

Cap bolt

Piston pin

Rod cap

Cap roller bearing

22. 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

23. Damper in an automobile is used to

Dissipate the energy

Increase the energy

Absorb the energy

Release the energy

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

Mean effective pressure

Compression ratio

Brake power

Specific air consumption

25. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To drive the fuel pump

To turn the flywheel

To drive the drive plate

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

Ignite the air-fuel mixture

Mix the fuel and air

Provide flame front for ignition

Spray atomized fuel in the cylinder

27. An imbalance wheel during vehicle operation

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

Creates a standing wave

Deflects in the vehicle's longitudinal direction

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

25°C

35°C

20°C

Ambient temperature

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

Indicated power

Frictional power

Brake power

None of these

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

Decrease

Be doubled

Increase

Remain constant

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31. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Parallel to the crankshaft

Inclined to the crankshaft

None of these

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

Tilt bracket

Lower bracket

Steering yoke joint

Upper bracket

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

60°

90°

45°

130°

34. The seat belt tensioners are built in the

Seat belt buckles

Front seats

Seat belt retractors

Shoulder anchors

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

Engine piston

Engine cylinder

Lubricating oil

Jacket cooling water

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

Makes chemicals by mechanical means

Has curved plates instead of flat plates

Uses chemical action to provide electricity

Does not use an electrolyte

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

One

Four

Two

Eight

38. The basic function of the suspension is to

Automatically correct the effects of over steering

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

Absorbs vibration and impact forces from the road surface

Ensure that wheel alignment is not disturbed during driving

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

Positive camber

Negative caster

Positive caster

Negative camber

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

Less chances of running flat

Better fuel efficiency

All of these

Slow air leakage

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

Central hub

Clutch pedal

Cushion springs

Coil springs known as torsional springs

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

13:1

15:1

10:1

17:1

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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