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

Cylinder head

Cylinder block

Crankshaft

Oil pan

2. The basic function of the suspension is to

Absorbs vibration and impact forces from the road surface

Automatically correct the effects of over steering

Ensure that wheel alignment is not disturbed during driving

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

3. The seat belt tensioners are built in the

Front seats

Seat belt buckles

Shoulder anchors

Seat belt retractors

4. 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

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

Specific air consumption

Mean effective pressure

Compression ratio

Brake power

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

Corners

Centre

Edges

None of these

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

None of the above

Opens at 10° after T.D.C. and closes at 20° before B.D.C.

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

Opens at 20° before T.D.C. and closes at 35° after B.D.C.

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

25 bar

45 bar

15 bar

35 bar

9. 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

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

Be doubled

Remain constant

Increase

Decrease

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

25°C

20°C

35°C

Ambient temperature

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

Central hub

Coil springs known as torsional springs

Clutch pedal

Cushion springs

13. The parking brakes employed in vehicles are operated

None of these

Hydraulically

Pneumatically

Mechanically

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

60°

90°

45°

130°

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

One

Four

Eight

Two

16. An imbalance wheel during vehicle operation

Creates a standing wave

Makes large noise when its heavy point hits the road surface

Deflects in the vehicle's longitudinal direction

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

17. The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole

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

Keeps the cylinder wall lubricated by holding oil in its channel

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

Noise level and strength

Noise level and economy

Strength and cost

Strength and less end thrust

19. 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

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

Vapour locking has no effect on brake performance

Brakes function more effectively

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

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

Positive caster

Negative caster

Negative camber

Positive camber

22. Damper in an automobile is used to

Increase the energy

Absorb the energy

Release the energy

Dissipate the energy

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

Ignite the air-fuel mixture

Mix the fuel and air

Spray atomized fuel in the cylinder

Provide flame front for ignition

24. The calorific value of Diesel is about

45.5 MJ/kg

38.5 MJ/kg

42.5 MJ/kg

36.5 MJ/kg

25. One effect of detonation is

Loss of power

Overcooling of engine

Delay in ignition

Overheating of engine

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

Lubricating oil

Engine cylinder

Jacket cooling water

Engine piston

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

Connecting rod

Piston pin boss

Piston skirt

Piston crown

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

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

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

29. 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

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

Cap roller bearing

Rod cap

Piston pin

Cap bolt

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31. The cam shaft in an engine is always mounted

None of these

Inclined to the crankshaft

Perpendicular to the crankshaft

Parallel to the crankshaft

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

Indicated power

None of these

Brake power

Frictional power

33. The function of a connecting rod is

To drive the drive plate

To turn the flywheel

To transmit motion of the piston to the crankshaft

To drive the fuel pump

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

Less chances of running flat

All of these

Better fuel efficiency

Slow air leakage

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

None of these

Recirculating exhaust

Using catalytic converter

Using some additives in the fuel

36. Clutch facings are usually attached to the plate by

Aluminium screws

Steel rivets

Brass rivets

Steel screws

37. Petrol that detonates easily is called

Blended fuel

Low octane petrol

Unleaded petrol

High octane petrol

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

Rocker arms

Valve stems

Camshaft pulley

Pistons

39. The purpose of transmission in an automobile is

To vary the speed of automobile

To vary the torque at the wheels

To vary the power of automobile

None of these

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

Tilt bracket

Steering yoke joint

Upper bracket

Lower bracket

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

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

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

43. Two general types of tyres are

Tube type and tubeless

Air and pneumatic

Solid and tubeless

Split rim and drop centre

Automobile Engineering Practice Set-7

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