Automobile Engineering Practice Set-7

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

Uses chemical action to provide electricity

Has curved plates instead of flat plates

Makes chemicals by mechanical means

Does not use an electrolyte

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

Brake power

Compression ratio

Specific air consumption

Mean effective pressure

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

25°C

Ambient temperature

20°C

35°C

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

Four

One

Eight

Two

5. The advantage of having a tandem master cylinder arrangement in automobiles is that it

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 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

6. The basic function of the suspension is to

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

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

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

13:1

10:1

17:1

15:1

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

Frictional power

None of these

Indicated power

Brake power

9. Two general types of tyres are

Split rim and drop centre

Tube type and tubeless

Air and pneumatic

Solid and tubeless

10. One effect of detonation is

Overheating of engine

Overcooling of engine

Loss of power

Delay in ignition

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

Camshaft pulley

Pistons

Rocker arms

Valve stems

12. Petrol that detonates easily is called

Blended fuel

Low octane petrol

High octane petrol

Unleaded petrol

13. The cam shaft in an engine is always mounted

Parallel to the crankshaft

Inclined to the crankshaft

Perpendicular to the crankshaft

None of these

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

Engine piston

Lubricating oil

Engine cylinder

Jacket cooling water

15. The purpose of transmission in an automobile is

To vary the torque at the wheels

To vary the speed of automobile

To vary the power of automobile

None of these

16. 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 less end thrust

Strength and cost

17. The parking brakes employed in vehicles are operated

Hydraulically

None of these

Pneumatically

Mechanically

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

Cushion springs

Coil springs known as torsional springs

Clutch pedal

Central hub

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

Remain constant

Decrease

Increase

Be doubled

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

Positive camber

Positive caster

Negative camber

Negative caster

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

Cap roller bearing

Piston pin

Rod cap

Cap bolt

22. 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

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

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

Tilt bracket

Lower bracket

Steering yoke joint

Upper bracket

24. 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

Brakes fail completely

Vapour locking has no effect on brake performance

25. The function of a connecting rod is

To drive the drive plate

To turn the flywheel

To drive the fuel pump

To transmit motion of the piston to the crankshaft

26. Damper in an automobile is used to

Increase the energy

Dissipate the energy

Absorb the energy

Release the energy

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

Crankshaft

Cylinder block

Oil pan

Cylinder head

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

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

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

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

Slow air leakage

Better fuel efficiency

Less chances of running flat

All of these

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

25 bar

15 bar

45 bar

35 bar

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31. 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

32. Clutch facings are usually attached to the plate by

Aluminium screws

Steel screws

Brass rivets

Steel rivets

33. An imbalance wheel during vehicle operation

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)

Creates a standing wave

34. The seat belt tensioners are built in the

Seat belt retractors

Seat belt buckles

Front seats

Shoulder anchors

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

Connecting rod

Piston crown

Piston skirt

Piston pin boss

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

Engine clutch, main shaft, counter shaft, 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

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

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

60°

130°

90°

45°

38. 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.

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

None of these

Recirculating exhaust

Using some additives in the fuel

Using catalytic converter

40. The calorific value of Diesel is about

45.5 MJ/kg

42.5 MJ/kg

36.5 MJ/kg

38.5 MJ/kg

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

2

6

8

4

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

Mix the fuel and air

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Provide flame front for ignition

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

Centre

None of these

Edges

Corners

Automobile Engineering Practice Set-7

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