Automobile Engineering Practice Set-7

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

Crankshaft

Cylinder head

Cylinder block

Oil pan

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

Eight

Two

One

Four

3. 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

4. Damper in an automobile is used to

Increase the energy

Dissipate the energy

Release the energy

Absorb the energy

5. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Inclined to the crankshaft

Parallel to the crankshaft

None of these

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

Upper bracket

Tilt bracket

Lower bracket

Steering yoke joint

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

Frictional power

Indicated power

Brake power

None of these

8. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

Deflects in the vehicle's longitudinal direction

Creates a standing wave

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

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

Noise level and economy

Strength and less end thrust

Strength and cost

Noise level and strength

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

Central hub

Clutch pedal

Coil springs known as torsional springs

Cushion springs

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11. 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.

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

Camshaft pulley

Valve stems

Pistons

Rocker arms

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

Vapour locking has no effect on brake performance

Brake operation is delayed after depression of the brake pedal

Brakes fail completely

Brakes function more effectively

14. The parking brakes employed in vehicles are operated

Hydraulically

None of these

Pneumatically

Mechanically

15. The seat belt tensioners are built in the

Front seats

Seat belt retractors

Shoulder anchors

Seat belt buckles

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

Remain constant

Decrease

Increase

Be doubled

17. 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

18. 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 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

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

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

130°

90°

60°

45°

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

Cap bolt

Rod cap

Cap roller bearing

Piston pin

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21. One effect of detonation is

Overheating of engine

Delay in ignition

Overcooling of engine

Loss of power

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

35°C

Ambient temperature

25°C

20°C

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. Two general types of tyres are

Tube type and tubeless

Split rim and drop centre

Air and pneumatic

Solid and tubeless

25. Petrol that detonates easily is called

Low octane petrol

Unleaded petrol

High octane petrol

Blended fuel

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

Makes chemicals by mechanical means

Uses chemical action to provide electricity

Does not use an electrolyte

Has curved plates instead of flat plates

27. The function of a connecting rod is

To turn the flywheel

To drive the fuel pump

To drive the drive plate

To transmit motion of the piston to the crankshaft

28. Clutch facings are usually attached to the plate by

Brass rivets

Steel screws

Aluminium screws

Steel rivets

29. 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

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

Centre

None of these

Corners

Edges

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

Jacket cooling water

Lubricating oil

Engine cylinder

Engine piston

32. 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

33. The function of oil control rings is that it

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

Lubricates the cylinder wall by releasing oil from its hole

Keeps the cylinder wall lubricated by holding oil in its channel

34. 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

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

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

Specific air consumption

Brake power

Compression ratio

Mean effective pressure

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

Piston skirt

Piston crown

Piston pin boss

Connecting rod

38. 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

39. A basic difference between the spark ignition engine and the Diesel engine is that the

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

All of the above

Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

Air temperature ignites the fuel in the Diesel engine

40. 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

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

Negative caster

Positive camber

Negative camber

Positive caster

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

Compression ring and aids the top ring in sealing and cooling

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

Back up oil control ring which will work in place of the bottom ring when it is broken

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

Using catalytic converter

Recirculating exhaust

Using some additives in the fuel

None of these

Automobile Engineering Practice Set-7

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