Automobile Engineering Practice Set-7

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1. An imbalance wheel during vehicle operation

Deflects in the vehicle's longitudinal direction

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

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

Connecting rod

Piston crown

Piston pin boss

Piston skirt

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

Steering yoke joint

Upper bracket

Lower bracket

Tilt bracket

4. The calorific value of Diesel is about

45.5 MJ/kg

42.5 MJ/kg

38.5 MJ/kg

36.5 MJ/kg

5. One effect of detonation is

Overcooling of engine

Overheating of engine

Loss of power

Delay in ignition

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

Coil springs known as torsional springs

Clutch pedal

Central hub

Cushion springs

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

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

Back up compression ring which will work in place of the top ring when it is broken

Cushion ring which prevents piston slap and knock

8. The cam shaft in an engine is always mounted

None of these

Perpendicular to the crankshaft

Inclined to the crankshaft

Parallel to the crankshaft

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

130°

60°

90°

45°

10. The basic function of the suspension is to

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

Automatically correct the effects of over steering

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11. 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

Air temperature ignites the fuel in the Diesel engine

All of the above

12. The function of a connecting rod is

To drive the fuel pump

To turn the flywheel

To drive the drive plate

To transmit motion of the piston to the crankshaft

13. 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

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

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

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

Strength and less end thrust

Noise level and economy

Strength and cost

Noise level and strength

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

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

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

16. 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

17. 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

18. 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

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

Cylinder block

Oil pan

Cylinder head

Crankshaft

20. The parking brakes employed in vehicles are operated

Mechanically

None of these

Pneumatically

Hydraulically

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21. Damper in an automobile is used to

Dissipate the energy

Release the energy

Absorb the energy

Increase the energy

22. Petrol that detonates easily is called

Unleaded petrol

Low octane petrol

High octane petrol

Blended fuel

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

None of these

Edges

Corners

Centre

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

Engine cylinder

Lubricating oil

Engine piston

Jacket cooling water

25. The seat belt tensioners are built in the

Seat belt retractors

Front seats

Seat belt buckles

Shoulder anchors

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

Brakes fail completely

Vapour locking has no effect on brake performance

Brakes function more effectively

Brake operation is delayed after depression of the brake pedal

27. 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

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

All of these

Better fuel efficiency

Less chances of running flat

Slow air leakage

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

Frictional power

None of these

Brake power

Indicated power

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

One

Eight

Two

Four

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

10:1

17:1

15:1

13:1

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

15 bar

35 bar

25 bar

45 bar

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

4

6

8

2

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

Cap roller bearing

Piston pin

Cap bolt

Rod cap

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

Rocker arms

Pistons

Camshaft pulley

Valve stems

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

20°C

25°C

35°C

Ambient temperature

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

Positive camber

Negative caster

Positive caster

Negative camber

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

Be doubled

Remain constant

Increase

Decrease

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

Recirculating exhaust

Using some additives in the fuel

Using catalytic converter

None of these

40. Two general types of tyres are

Solid and tubeless

Air and pneumatic

Split rim and drop centre

Tube type and tubeless

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41. 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

42. Clutch facings are usually attached to the plate by

Steel screws

Steel rivets

Aluminium screws

Brass rivets

43. 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

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 serving two independent lines in a divided line brake circuit

Automobile Engineering Practice Set-7

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Automobile Engineering Practice Set-7

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