Automobile Engineering Practice Set-7

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1. An imbalance wheel during vehicle operation

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

Deflects in the vehicle's longitudinal direction

2. 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

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

Cylinder block

Cylinder head

Oil pan

Crankshaft

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

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

None of the above

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.

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

Eight

One

Two

Four

6. The parking brakes employed in vehicles are operated

Hydraulically

Pneumatically

Mechanically

None of these

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

Coil springs known as torsional springs

Cushion springs

Central hub

Clutch pedal

8. The calorific value of Diesel is about

38.5 MJ/kg

36.5 MJ/kg

45.5 MJ/kg

42.5 MJ/kg

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

Engine piston

Lubricating oil

Engine cylinder

Jacket cooling water

10. 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

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11. One effect of detonation is

Delay in ignition

Overcooling of engine

Overheating of engine

Loss of power

12. 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 drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels

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

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

Edges

Centre

Corners

None of these

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

Tilt bracket

Lower bracket

Steering yoke joint

Upper bracket

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

Has curved plates instead of flat plates

Does not use an electrolyte

Makes chemicals by mechanical means

Uses chemical action to provide electricity

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

All of the above

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

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

17. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To turn the flywheel

To drive the drive plate

To drive the fuel pump

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

Noise level and economy

Noise level and strength

Strength and cost

Strength and less end thrust

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

25°C

Ambient temperature

20°C

35°C

20. Damper in an automobile is used to

Dissipate the energy

Increase the energy

Absorb the energy

Release the energy

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21. The basic function of the suspension is to

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

Automatically correct the effects of over steering

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

8

6

2

4

23. The seat belt tensioners are built in the

Seat belt buckles

Front seats

Seat belt retractors

Shoulder anchors

24. Petrol that detonates easily is called

Unleaded petrol

High octane petrol

Blended fuel

Low octane petrol

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

Using catalytic converter

None of these

Using some additives in the fuel

Recirculating exhaust

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

Vapour locking has no effect on brake performance

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

Brakes function more effectively

27. Two general types of tyres are

Solid and tubeless

Split rim and drop centre

Air and pneumatic

Tube type and tubeless

28. 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

Cushion ring which prevents piston slap and knock

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

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

45°

90°

130°

60°

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

Increase

Decrease

Be doubled

Remain constant

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

Brake power

Indicated power

None of these

Frictional power

32. 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

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

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

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

10:1

15:1

13:1

17:1

34. Clutch facings are usually attached to the plate by

Steel screws

Steel rivets

Aluminium screws

Brass rivets

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

Brake power

Compression ratio

Mean effective pressure

Specific air consumption

36. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Inclined to the crankshaft

Parallel to the crankshaft

None of these

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

Slow air leakage

All of these

Better fuel efficiency

Less chances of running flat

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

Positive camber

Negative caster

Positive caster

Negative camber

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

Mix the fuel and air

Provide flame front for ignition

Spray atomized fuel in the cylinder

Ignite the air-fuel mixture

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

Valve stems

Pistons

Camshaft pulley

Rocker arms

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

Cap bolt

Rod cap

Piston pin

Cap roller bearing

43. The purpose of transmission in an automobile is

To vary the speed of automobile

None of these

To vary the power of automobile

To vary the torque at the wheels

Automobile Engineering Practice Set-7

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