Automobile Engineering Practice Set-7

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1. The calorific value of Diesel is about

38.5 MJ/kg

36.5 MJ/kg

42.5 MJ/kg

45.5 MJ/kg

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

25 bar

45 bar

35 bar

15 bar

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

Lower bracket

Steering yoke joint

Upper bracket

Tilt bracket

4. Clutch facings are usually attached to the plate by

Steel screws

Steel rivets

Brass rivets

Aluminium screws

5. 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

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

Compression ring and aids the top ring in sealing and cooling

Cushion ring which prevents piston slap and knock

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

Provide flame front for ignition

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Mix the fuel and air

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

Rod cap

Cap roller bearing

Piston pin

Cap bolt

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

15:1

10:1

17:1

13:1

9. Petrol that detonates easily is called

Blended fuel

Unleaded petrol

Low octane petrol

High octane petrol

10. The purpose of transmission in an automobile is

To vary the power of automobile

To vary the torque at the wheels

To vary the speed of automobile

None of these

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

Noise level and economy

Strength and cost

Noise level and strength

Strength and less end thrust

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

Negative camber

Positive camber

Positive caster

Negative caster

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

Has curved plates instead of flat plates

Makes chemicals by mechanical means

Does not use an electrolyte

Uses chemical action to provide electricity

14. 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

Deflects in the vehicle's longitudinal direction

Creates a standing wave

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

Oil pan

Cylinder block

Cylinder head

Crankshaft

16. The basic function of the suspension is to

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

Automatically correct the effects of over steering

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

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

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

None of the above

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

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

Be doubled

Remain constant

Increase

Decrease

19. The cam shaft in an engine is always mounted

Inclined to the crankshaft

Parallel to the crankshaft

Perpendicular to the crankshaft

None of these

20. 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

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

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21. Damper in an automobile is used to

Release the energy

Dissipate the energy

Absorb the energy

Increase the energy

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

Slow air leakage

All of these

Less chances of running flat

Better fuel efficiency

23. One effect of detonation is

Overheating of engine

Loss of power

Overcooling of engine

Delay in ignition

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

Compression ratio

Specific air consumption

Mean effective pressure

Brake power

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

One

Eight

Two

Four

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

Clutch pedal

Coil springs known as torsional springs

Central hub

Cushion springs

27. Two general types of tyres are

Solid and tubeless

Tube type and tubeless

Air and pneumatic

Split rim and drop centre

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

35°C

25°C

20°C

Ambient temperature

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

Piston pin boss

Connecting rod

Piston skirt

Piston crown

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

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

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31. The seat belt tensioners are built in the

Seat belt buckles

Front seats

Shoulder anchors

Seat belt retractors

32. 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

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

Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss

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

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

None of these

Centre

Edges

Corners

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

Rocker arms

Valve stems

Camshaft pulley

Pistons

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

Recirculating exhaust

Using catalytic converter

Using some additives in the fuel

None of these

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

130°

45°

90°

60°

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

Brakes function more effectively

Vapour locking has no effect on brake performance

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

39. 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

Keeps the cylinder wall lubricated by holding oil in its channel

Lubricates the cylinder wall by releasing oil from its hole

40. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To drive the drive plate

To turn the flywheel

To drive the fuel pump

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

Brake power

Frictional power

Indicated power

None of these

42. The parking brakes employed in vehicles are operated

Pneumatically

Mechanically

None of these

Hydraulically

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

Engine piston

Lubricating oil

Jacket cooling water

Engine cylinder

Automobile Engineering Practice Set-7

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