Automobile Engineering Practice Set-7

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

Tilt bracket

Upper bracket

Lower bracket

Steering yoke joint

2. The purpose of transmission in an automobile is

None of these

To vary the torque at the wheels

To vary the power of automobile

To vary the speed of automobile

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

25°C

Ambient temperature

20°C

35°C

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

Uses chemical action to provide electricity

Does not use an electrolyte

Has curved plates instead of flat plates

Makes chemicals by mechanical means

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

15:1

17:1

10:1

13:1

6. Clutch facings are usually attached to the plate by

Steel screws

Steel rivets

Brass rivets

Aluminium screws

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

60°

90°

130°

45°

8. 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

9. Petrol that detonates easily is called

Blended fuel

Low octane petrol

High octane petrol

Unleaded petrol

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

15 bar

35 bar

25 bar

45 bar

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

Brakes fail completely

Brake operation is delayed after depression of the brake pedal

Brakes function more effectively

Vapour locking has no effect on brake performance

12. 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

13. One effect of detonation is

Loss of power

Overcooling of engine

Delay in ignition

Overheating of engine

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

Crankshaft

Oil pan

Cylinder head

Cylinder block

15. Two general types of tyres are

Air and pneumatic

Tube type and tubeless

Split rim and drop centre

Solid and tubeless

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

Compression ratio

Specific air consumption

Brake power

Mean effective pressure

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

Remain constant

Decrease

Increase

Be doubled

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

Cushion springs

Coil springs known as torsional springs

Central hub

Clutch pedal

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

Piston pin boss

Connecting rod

Piston crown

Piston skirt

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

Camshaft pulley

Pistons

Rocker arms

Valve stems

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

Centre

Corners

None of these

Edges

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

Frictional power

Brake power

Indicated power

None of these

23. 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 20° before T.D.C. and closes at 35° after B.D.C.

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

24. The function of oil control rings is that it

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

Lubricates the cylinder wall by releasing oil from its hole

25. Damper in an automobile is used to

Absorb the energy

Release the energy

Increase the energy

Dissipate the energy

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

Positive caster

Negative caster

Positive camber

Negative camber

27. 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

28. An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface

Creates a standing wave

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

Deflects in the vehicle's longitudinal direction

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

Cap bolt

Rod cap

Piston pin

Cap roller bearing

30. 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

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31. The parking brakes employed in vehicles are operated

Pneumatically

Mechanically

None of these

Hydraulically

32. 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

33. 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

34. The cam shaft in an engine is always mounted

Parallel to the crankshaft

Inclined to the crankshaft

Perpendicular to the crankshaft

None of these

35. 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

Air temperature ignites the fuel in the Diesel engine

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

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

Two

One

Four

Eight

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

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 serving two independent lines in a divided line brake circuit

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

Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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

8

4

6

2

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

Jacket cooling water

Engine piston

Engine cylinder

Lubricating oil

40. 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

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41. 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

42. The calorific value of Diesel is about

36.5 MJ/kg

42.5 MJ/kg

45.5 MJ/kg

38.5 MJ/kg

43. The seat belt tensioners are built in the

Shoulder anchors

Seat belt buckles

Seat belt retractors

Front seats

Automobile Engineering Practice Set-7

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