Automobile Engineering Practice Set-7

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1. Petrol that detonates easily is called

High octane petrol

Low octane petrol

Unleaded petrol

Blended fuel

2. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To turn the flywheel

To drive the fuel pump

To drive the drive plate

3. Clutch facings are usually attached to the plate by

Steel rivets

Brass rivets

Steel screws

Aluminium screws

4. 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

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

60°

45°

130°

90°

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

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

Upper bracket

Lower bracket

Steering yoke joint

Tilt bracket

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

13:1

10:1

15:1

17:1

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

Corners

Centre

Edges

None of these

10. 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

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

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

Strength and less end thrust

Noise level and economy

Noise level and strength

Strength and cost

12. The cam shaft in an engine is always mounted

None of these

Perpendicular to the crankshaft

Parallel to the crankshaft

Inclined to the crankshaft

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

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

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

Cushion ring which prevents piston slap and knock

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

Connecting rod

Piston pin boss

Piston skirt

Piston crown

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

Air temperature ignites the fuel in the Diesel engine

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

All of the above

Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

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

Positive caster

Positive camber

Negative caster

Negative camber

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

45 bar

35 bar

15 bar

25 bar

18. The purpose of transmission in an automobile is

To vary the torque at the wheels

None of these

To vary the speed of automobile

To vary the power of automobile

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

Decrease

Be doubled

Remain constant

Increase

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

Better fuel efficiency

Slow air leakage

All of these

Less chances of running flat

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21. The seat belt tensioners are built in the

Seat belt retractors

Shoulder anchors

Front seats

Seat belt buckles

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

20°C

35°C

25°C

Ambient temperature

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

Spray atomized fuel in the cylinder

Ignite the air-fuel mixture

Mix the fuel and air

Provide flame front for ignition

24. The calorific value of Diesel is about

38.5 MJ/kg

36.5 MJ/kg

42.5 MJ/kg

45.5 MJ/kg

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

Mean effective pressure

Specific air consumption

Compression ratio

Brake power

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

Central hub

Clutch pedal

Cushion springs

Coil springs known as torsional springs

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

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

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

28. One effect of detonation is

Loss of power

Delay in ignition

Overcooling of engine

Overheating of engine

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

Engine piston

Jacket cooling water

Engine cylinder

Lubricating oil

30. 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

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

Valve stems

Rocker arms

Camshaft pulley

Pistons

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

None of the above

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.

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

Oil pan

Crankshaft

Cylinder block

Cylinder head

34. 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

Keeps the cylinder wall lubricated by holding oil in its channel

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

35. Two general types of tyres are

Tube type and tubeless

Solid and tubeless

Air and pneumatic

Split rim and drop centre

36. Damper in an automobile is used to

Release the energy

Absorb the energy

Dissipate the energy

Increase the energy

37. 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 the steering wheel can deliver a suitable amount of steering force

Ensure that wheel alignment is not disturbed during driving

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

Cap bolt

Rod cap

Piston pin

Cap roller bearing

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

Using some additives in the fuel

None of these

Using catalytic converter

Recirculating exhaust

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

Brake power

Frictional power

None of these

Indicated power

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41. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

Deflects in the vehicle's longitudinal direction

Creates a standing wave

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

42. The parking brakes employed in vehicles are operated

None of these

Pneumatically

Hydraulically

Mechanically

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

Four

One

Eight

Two

Automobile Engineering Practice Set-7

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