Automobile Engineering Practice Set-7

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1. One effect of detonation is

Overcooling of engine

Loss of power

Overheating of engine

Delay in ignition

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

Be doubled

Increase

Remain constant

Decrease

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

Brakes function more effectively

Brake operation is delayed after depression of the brake pedal

Brakes fail completely

Vapour locking has no effect on brake performance

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

Spray atomized fuel in the cylinder

Mix the fuel and air

Ignite the air-fuel mixture

Provide flame front for ignition

5. 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

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

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

Negative caster

Negative camber

Positive caster

Positive camber

7. Two general types of tyres are

Tube type and tubeless

Split rim and drop centre

Solid and tubeless

Air and pneumatic

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

Ambient temperature

25°C

20°C

35°C

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

Compression ratio

Specific air consumption

Mean effective pressure

Brake power

10. Petrol that detonates easily is called

Blended fuel

Low octane petrol

High octane petrol

Unleaded petrol

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

Noise level and strength

Strength and less end thrust

Strength and cost

Noise level and economy

12. 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

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

Automatically correct the effects of over steering

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

Corners

Centre

Edges

None of these

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

Crankshaft

Cylinder head

Oil pan

Cylinder block

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

Piston crown

Connecting rod

Piston skirt

Piston pin boss

16. The calorific value of Diesel is about

38.5 MJ/kg

36.5 MJ/kg

42.5 MJ/kg

45.5 MJ/kg

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

10:1

13:1

15:1

17:1

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

Lower bracket

Upper bracket

Tilt bracket

Steering yoke joint

19. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Inclined to the crankshaft

Parallel to the crankshaft

None of these

20. 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

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21. Damper in an automobile is used to

Absorb the energy

Dissipate the energy

Release the energy

Increase the energy

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

None of these

Frictional power

Brake power

Indicated power

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

Clutch pedal

Cushion springs

Coil springs known as torsional springs

Central hub

24. Clutch facings are usually attached to the plate by

Brass rivets

Steel screws

Aluminium screws

Steel rivets

25. 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

26. An imbalance wheel during vehicle operation

Deflects in the vehicle's longitudinal direction

Makes large noise when its heavy point hits the road surface

Creates a standing wave

Bounces vertically or deflects from side to side (as seen from front or rear)

27. The purpose of transmission in an automobile is

To vary the torque at the wheels

To vary the speed of automobile

None of these

To vary the power of automobile

28. The seat belt tensioners are built in the

Seat belt buckles

Front seats

Shoulder anchors

Seat belt retractors

29. 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

30. 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

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31. The function of a connecting rod is

To drive the fuel pump

To transmit motion of the piston to the crankshaft

To drive the drive plate

To turn the flywheel

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

45 bar

15 bar

35 bar

25 bar

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

Valve stems

Pistons

Rocker arms

Camshaft pulley

34. 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

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

2

4

8

6

36. 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

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

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

37. The function of oil control rings is that it

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

Lubricates the cylinder wall by releasing oil from its hole

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

38. 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

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

Air temperature ignites the fuel in the Diesel engine

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

Two

One

Four

Eight

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

Piston pin

Rod cap

Cap bolt

Cap roller bearing

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

Engine cylinder

Jacket cooling water

Engine piston

Lubricating oil

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

90°

45°

60°

130°

43. The parking brakes employed in vehicles are operated

Pneumatically

Hydraulically

Mechanically

None of these

Automobile Engineering Practice Set-7

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