Automobile Engineering Practice Set-7

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1. 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

2. An imbalance wheel during vehicle operation

Creates a standing wave

Deflects in the vehicle's longitudinal direction

Makes large noise when its heavy point hits the road surface

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

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

10:1

13:1

17:1

15:1

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

Increase

Decrease

Be doubled

Remain constant

5. 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

6. The parking brakes employed in vehicles are operated

None of these

Pneumatically

Mechanically

Hydraulically

7. The calorific value of Diesel is about

45.5 MJ/kg

36.5 MJ/kg

38.5 MJ/kg

42.5 MJ/kg

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

Four

Eight

One

Two

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

Piston skirt

Connecting rod

Piston crown

Piston pin boss

10. The basic function of the suspension is to

Automatically correct the effects of over steering

Ensure that wheel alignment is not disturbed during driving

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

Absorbs vibration and impact forces from the road surface

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

35 bar

15 bar

25 bar

45 bar

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

Valve stems

Rocker arms

Camshaft pulley

Pistons

13. Clutch facings are usually attached to the plate by

Steel screws

Aluminium screws

Steel rivets

Brass rivets

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

20°C

35°C

25°C

Ambient temperature

15. 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

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

Strength and cost

Noise level and strength

Noise level and economy

Strength and less end thrust

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

18. 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

19. The function of a connecting rod is

To turn the flywheel

To drive the drive plate

To transmit motion of the piston to the crankshaft

To drive the fuel pump

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

Coil springs known as torsional springs

Clutch pedal

Central hub

Cushion springs

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

Has curved plates instead of flat plates

Uses chemical action to provide electricity

Does not use an electrolyte

Makes chemicals by mechanical means

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

90°

130°

45°

60°

23. Damper in an automobile is used to

Dissipate the energy

Increase the energy

Release the energy

Absorb the energy

24. Two general types of tyres are

Air and pneumatic

Solid and tubeless

Split rim and drop centre

Tube type and tubeless

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

Upper bracket

Lower bracket

Steering yoke joint

Tilt bracket

26. One effect of detonation is

Overheating of engine

Delay in ignition

Overcooling of engine

Loss of power

27. 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.

None of the above

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

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

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

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

29. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Inclined to the crankshaft

None of these

Parallel to the crankshaft

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

Cap bolt

Piston pin

Rod cap

Cap roller bearing

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31. 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

32. The purpose of transmission in an automobile is

None of these

To vary the speed of automobile

To vary the torque at the wheels

To vary the power of automobile

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

Positive camber

Positive caster

Negative camber

Negative caster

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

Using some additives in the fuel

Using catalytic converter

None of these

Recirculating exhaust

35. 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

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

None of these

Brake power

Frictional power

Indicated power

37. 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

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

Lubricates the cylinder wall by releasing oil from its hole

Keeps the cylinder wall lubricated by holding oil in its channel

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

Lubricating oil

Engine cylinder

Jacket cooling water

Engine piston

39. The seat belt tensioners are built in the

Shoulder anchors

Front seats

Seat belt buckles

Seat belt retractors

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

Corners

None of these

Centre

Edges

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41. 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

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

Brake power

Mean effective pressure

Specific air consumption

Compression ratio

43. Petrol that detonates easily is called

Unleaded petrol

High octane petrol

Blended fuel

Low octane petrol

Automobile Engineering Practice Set-7

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