Automobile Engineering Practice Set-7

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

8

6

4

2

2. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

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

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

Piston skirt

Piston crown

Piston pin boss

Connecting rod

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

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

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

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

Ambient temperature

35°C

25°C

20°C

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

Specific air consumption

Mean effective pressure

Brake power

Compression ratio

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

Lubricates the cylinder wall by releasing oil from its hole

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

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

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

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Mix the fuel and air

Provide flame front for ignition

10. The purpose of transmission in an automobile is

To vary the speed of automobile

None of these

To vary the torque at the wheels

To vary the power of automobile

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

Be doubled

Remain constant

Increase

Decrease

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

Eight

One

Two

Four

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

Steering yoke joint

Upper bracket

Lower bracket

Tilt bracket

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

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

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

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

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

Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side

16. Clutch facings are usually attached to the plate by

Aluminium screws

Brass rivets

Steel rivets

Steel screws

17. 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

18. The parking brakes employed in vehicles are operated

Mechanically

Pneumatically

None of these

Hydraulically

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

Coil springs known as torsional springs

Cushion springs

Central hub

Clutch pedal

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

Negative camber

Positive camber

Negative caster

Positive caster

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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

Cylinder block

Oil pan

Crankshaft

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

Brake power

Indicated power

None of these

Frictional power

23. The calorific value of Diesel is about

42.5 MJ/kg

38.5 MJ/kg

36.5 MJ/kg

45.5 MJ/kg

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

Rod cap

Piston pin

Cap bolt

Cap roller bearing

25. The cam shaft in an engine is always mounted

Inclined to the crankshaft

Parallel to the crankshaft

None of these

Perpendicular to the crankshaft

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

Centre

None of these

Edges

Corners

27. 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

All of the above

Air temperature ignites the fuel in the Diesel engine

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

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

Pistons

Rocker arms

Camshaft pulley

Valve stems

29. The function of a connecting rod is

To turn the flywheel

To transmit motion of the piston to the crankshaft

To drive the fuel pump

To drive the drive plate

30. Petrol that detonates easily is called

Unleaded petrol

High octane petrol

Low octane petrol

Blended fuel

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31. Two general types of tyres are

Split rim and drop centre

Air and pneumatic

Tube type and tubeless

Solid and tubeless

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

45°

130°

60°

90°

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

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

Opens at 20° before T.D.C. and closes at 35° after B.D.C.

Opens at 10° after T.D.C. and closes at 20° before B.D.C.

None of the above

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

Makes chemicals by mechanical means

Does not use an electrolyte

Uses chemical action to provide electricity

Has curved plates instead of flat plates

35. The seat belt tensioners are built in the

Seat belt buckles

Seat belt retractors

Front seats

Shoulder anchors

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

Brake operation is delayed after depression of the brake pedal

Brakes function more effectively

Brakes fail completely

Vapour locking has no effect on brake performance

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

17:1

15:1

13:1

10:1

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

Engine piston

Engine cylinder

Jacket cooling water

Lubricating oil

39. Damper in an automobile is used to

Release the energy

Dissipate the energy

Absorb the energy

Increase the energy

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

Slow air leakage

Less chances of running flat

Better fuel efficiency

All of these

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41. The basic function of the suspension is to

Automatically correct the effects of over steering

Ensure that wheel alignment is not disturbed during driving

Absorbs vibration and impact forces from the road surface

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

42. 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

43. One effect of detonation is

Delay in ignition

Overheating of engine

Loss of power

Overcooling of engine

Automobile Engineering Practice Set-7

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