Automobile Engineering Practice Set-7

Page 1 of 5

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

Piston pin

Rod cap

Cap bolt

Cap roller bearing

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

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

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

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

20°C

Ambient temperature

35°C

25°C

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

60°

45°

90°

130°

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

Negative caster

Positive caster

Positive camber

Negative camber

6. 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.

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

Eight

One

Two

Four

8. 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

9. One effect of detonation is

Overheating of engine

Delay in ignition

Loss of power

Overcooling of engine

10. Damper in an automobile is used to

Increase the energy

Dissipate the energy

Absorb the energy

Release the energy

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

Central hub

Cushion springs

Clutch pedal

Coil springs known as torsional springs

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

Indicated power

None of these

Frictional power

Brake power

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

17:1

13:1

15:1

10:1

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

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

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

Engine piston

Jacket cooling water

Lubricating oil

Engine cylinder

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

Rocker arms

Pistons

Camshaft pulley

Valve stems

17. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

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)

18. The function of a connecting rod is

To drive the drive plate

To transmit motion of the piston to the crankshaft

To turn the flywheel

To drive the fuel pump

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

35 bar

45 bar

25 bar

15 bar

20. Two general types of tyres are

Split rim and drop centre

Air and pneumatic

Tube type and tubeless

Solid and tubeless

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

Using some additives in the fuel

Using catalytic converter

Recirculating exhaust

None of these

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

Tilt bracket

Steering yoke joint

Upper bracket

Lower bracket

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

6

4

8

2

24. 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

25. The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole

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

Keeps the cylinder wall lubricated by holding oil in its channel

26. The seat belt tensioners are built in the

Front seats

Shoulder anchors

Seat belt buckles

Seat belt retractors

27. 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

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

Decrease

Be doubled

Increase

Remain constant

29. The cam shaft in an engine is always mounted

Inclined to the crankshaft

Parallel to the crankshaft

None of these

Perpendicular to the crankshaft

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

Does not use an electrolyte

Has curved plates instead of flat plates

Makes chemicals by mechanical means

Uses chemical action to provide electricity

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

Piston skirt

Connecting rod

Piston crown

Piston pin boss

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

Ignite the air-fuel mixture

Provide flame front for ignition

Spray atomized fuel in the cylinder

Mix the fuel and air

33. Petrol that detonates easily is called

High octane petrol

Low octane petrol

Blended fuel

Unleaded petrol

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

Corners

Centre

None of these

Edges

35. The calorific value of Diesel is about

38.5 MJ/kg

45.5 MJ/kg

42.5 MJ/kg

36.5 MJ/kg

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

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

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

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

Mean effective pressure

Specific air consumption

Compression ratio

Brake power

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

Strength and less end thrust

Noise level and strength

Strength and cost

Noise level and economy

39. 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

Ensure that wheel alignment is not disturbed during driving

Automatically correct the effects of over steering

40. 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

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

Cylinder head

Crankshaft

Oil pan

Cylinder block

42. Clutch facings are usually attached to the plate by

Brass rivets

Steel rivets

Aluminium screws

Steel screws

43. The parking brakes employed in vehicles are operated

Hydraulically

Pneumatically

None of these

Mechanically

Automobile Engineering Practice Set-7

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