Automobile Engineering Practice Set-7

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1. 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

Enhances safety by serving two independent lines in a divided line brake circuit

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

2. The purpose of transmission in an automobile is

To vary the speed of automobile

None of these

To vary the torque at the wheels

To vary the power of automobile

3. The cam shaft in an engine is always mounted

Parallel to the crankshaft

Perpendicular to the crankshaft

Inclined to the crankshaft

None of these

4. The basic function of the suspension is to

Automatically correct the effects of over steering

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

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

Indicated power

Frictional power

None of these

Brake power

6. 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

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

Valve stems

Camshaft pulley

Pistons

Rocker arms

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

15 bar

35 bar

45 bar

25 bar

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

Noise level and strength

Strength and less end thrust

Noise level and economy

Strength and cost

10. 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

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11. Petrol that detonates easily is called

High octane petrol

Low octane petrol

Unleaded petrol

Blended fuel

12. The parking brakes employed in vehicles are operated

Mechanically

Hydraulically

Pneumatically

None of these

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

All of these

Slow air leakage

Better fuel efficiency

Less chances of running flat

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

Steering yoke joint

Upper bracket

Tilt bracket

Lower bracket

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

Using catalytic converter

Recirculating exhaust

None of these

Using some additives in the fuel

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

15:1

13:1

10:1

17:1

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. The number of exhaust manifolds in a V6 engine is

Four

One

Two

Eight

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

Ambient temperature

20°C

35°C

25°C

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

Jacket cooling water

Engine cylinder

Lubricating oil

Engine piston

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21. The calorific value of Diesel is about

38.5 MJ/kg

42.5 MJ/kg

36.5 MJ/kg

45.5 MJ/kg

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

Makes chemicals by mechanical means

Does not use an electrolyte

Uses chemical action to provide electricity

Has curved plates instead of flat plates

23. 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

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

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

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

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

Piston pin

Cap bolt

Rod cap

Cap roller bearing

26. The function of oil control rings is that it

Keeps the cylinder wall lubricated by holding oil in its channel

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

Lubricates the cylinder wall by releasing oil from its hole

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

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

Brake power

Specific air consumption

Mean effective pressure

Compression ratio

28. Clutch facings are usually attached to the plate by

Steel rivets

Steel screws

Brass rivets

Aluminium screws

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

None of these

Centre

Corners

Edges

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

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31. 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

Vapour locking has no effect on brake performance

Brakes fail completely

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

Increase

Decrease

Remain constant

Be doubled

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

Positive caster

Positive camber

Negative camber

Negative caster

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

Piston crown

Piston pin boss

Connecting rod

Piston skirt

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

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

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

36. The seat belt tensioners are built in the

Front seats

Shoulder anchors

Seat belt buckles

Seat belt retractors

37. 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

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

90°

130°

45°

60°

39. One effect of detonation is

Loss of power

Overheating of engine

Delay in ignition

Overcooling of engine

40. Damper in an automobile is used to

Increase the energy

Release the energy

Dissipate the energy

Absorb the energy

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

Coil springs known as torsional springs

Clutch pedal

Central hub

Cushion springs

42. 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

43. Two general types of tyres are

Split rim and drop centre

Tube type and tubeless

Air and pneumatic

Solid and tubeless

Automobile Engineering Practice Set-7

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