Automobile Engineering Practice Set-7

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

Negative caster

Negative camber

Positive camber

Positive caster

2. Damper in an automobile is used to

Absorb the energy

Release the energy

Dissipate the energy

Increase the energy

3. The basic function of the suspension is to

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

Automatically correct the effects of over steering

4. The purpose of transmission in an automobile is

None of these

To vary the power of automobile

To vary the torque at the wheels

To vary the speed of automobile

5. The calorific value of Diesel is about

45.5 MJ/kg

36.5 MJ/kg

42.5 MJ/kg

38.5 MJ/kg

6. The cam shaft in an engine is always mounted

Perpendicular to the crankshaft

Inclined to the crankshaft

Parallel to the crankshaft

None of these

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

Decrease

Remain constant

Increase

Be doubled

8. Two general types of tyres are

Air and pneumatic

Tube type and tubeless

Split rim and drop centre

Solid and tubeless

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

Crankshaft

Oil pan

Cylinder block

Cylinder head

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

Using catalytic converter

Using some additives in the fuel

None of these

Recirculating exhaust

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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 strength

Strength and cost

Noise level and economy

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

Slow air leakage

Less chances of running flat

Better fuel efficiency

All of these

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

45 bar

25 bar

15 bar

35 bar

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

Rod cap

Cap bolt

Cap roller bearing

Piston pin

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

Four

One

Two

Eight

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

Brake power

Mean effective pressure

Specific air consumption

Compression ratio

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

Upper bracket

Steering yoke joint

Lower bracket

Tilt bracket

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

Ignite the air-fuel mixture

Spray atomized fuel in the cylinder

Mix the fuel and air

Provide flame front for ignition

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

20. Clutch facings are usually attached to the plate by

Steel rivets

Brass rivets

Steel screws

Aluminium screws

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

45°

60°

90°

130°

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

Edges

Centre

Corners

None of these

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

Valve stems

Pistons

Rocker arms

Camshaft pulley

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

Has curved plates instead of flat plates

Makes chemicals by mechanical means

Uses chemical action to provide electricity

Does not use an electrolyte

25. 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 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

26. 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

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

Air temperature ignites the fuel in the Diesel engine

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

17:1

13:1

10:1

15:1

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

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

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

29. The function of a connecting rod is

To transmit motion of the piston to the crankshaft

To drive the drive plate

To drive the fuel pump

To turn the flywheel

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

Piston skirt

Connecting rod

Piston pin boss

Piston crown

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31. The parking brakes employed in vehicles are operated

Pneumatically

Mechanically

Hydraulically

None of these

32. An imbalance wheel during vehicle operation

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

Makes large noise when its heavy point hits the road surface

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

25°C

20°C

35°C

Ambient temperature

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

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

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

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

Vapour locking has no effect on brake performance

Brakes fail completely

Brakes function more effectively

Brake operation is delayed after depression of the brake pedal

36. Petrol that detonates easily is called

Low octane petrol

Unleaded petrol

High octane petrol

Blended fuel

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

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

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

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

Jacket cooling water

Engine piston

Lubricating oil

Engine cylinder

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

Coil springs known as torsional springs

Central hub

Cushion springs

Clutch pedal

40. The seat belt tensioners are built in the

Seat belt buckles

Front seats

Seat belt retractors

Shoulder anchors

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41. One effect of detonation is

Overheating of engine

Overcooling of engine

Loss of power

Delay in ignition

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

None of these

Frictional power

Brake power

Indicated power

43. The function of oil control rings is that it

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

Keeps the cylinder wall lubricated by holding oil in its channel

Maintains a seal and prevents escape of burned gases and oil leakage

Automobile Engineering Practice Set-7

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