Automobile Engineering Practice Set-2

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1. In a petrol engine, the high voltage for spark plug is in the order of

22 kilovolts

2000 volts

11 kilovolts

1000 volts

2. The cetane rating of Diesel fuel is in the order of

25

45

90

70

3. A traction control system (TCS) in automobiles controls the

Engine power during acceleration

Torque that is transmitted by the tyres to the road surface

Vibrations on the steering wheel

Stopping distance in case of emergency

4. The positive plates of a lead acid battery has

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

5. In comparison with a radial tyre, one advantage of a bias ply tyre is

None of these

Longer life

Smoother ride at low speeds

Lower rolling resistance

6. The composition of the electrolyte in a fully charged battery is that

The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight

The electrolyte is pure sulphuric acid

The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

The electrolyte is pure distilled water

7. Thinner is added to the paint in order to

Optimise its viscosity

None of these

Make paint film hard

Make pigments and resin mix easily

8. When the battery is half (50%) charged, the specific gravity of acid in a battery is usually

1.00

0.74

1.19

1.12

9. The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluid is more resistant to freezing than DOT 3 fluid

DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life

DOT 4 fluids have a lower boiling point than DOT 3 fluid

DOT 4 fluids have a higher boiling point than DOT 3 fluid

10. The main merit of a multi cylinder type cylinder sleeve is

None of these

Smaller engine dimensions

High rigidity

Better cooling efficiency

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11. The component in the radiator of an automobile that increases the boiling point of water is

Drain plug

Vacuum valve

Water jacket

Pressure cap

12. The torque converter uses ________ to transfer torque.

Air

Gears

Steel belt

Automatic transmission fluid (ATF)

13. The rigid suspension is beneficial when

Large changes in load make it necessary to have a large suspension stroke

It is desired to have more flexibility in design

It is desired to improve tyre to ground contact characteristics

It is desired to reduce the unsprung mass

14. The air gap between the central electrode and ground (or side) electrode of a spark plug is around

1.5 mm

1 mm

0.2 mm

0.5 mm

15. The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

Camber

Toe out

Toe in

Caster

16. A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is

1200 cm³

600 cm³

400 cm³

2400 cm³

17. The acid used in automobile battery is

Hydrochloric acid

Hydrofluoric acid

Sulphuric acid

Nitric acid

18. The compression ratio of a petrol engine is nearly

20:1

8:1

4:1

15:1

19. The formula for Iso-octane is

C7H17

C7H18

C8H18

C6H18

20. The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

Valve timing diagram

None of these

Indicator diagram

Axial force diagram

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21. Highest useful compression ratio (HUCR) is the highest compression ratio at which the

Engine gives maximum output

Engine is most efficient

Fuel can be used in a test engine without knocking

Engine can run

22. The ball joints are used on the tie rod ends, because they

Reduce the amount of sliding resistance

Reduce the amount of noise generated

Improve the force transmission speed

Can deal with movement of the suspension both vertically and in other directions

23. A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is

8091 Nm

809.1 Nm

80.91 Nm

8.091 Nm

24. The starter motor is driven by

V-belt drive

Chain drive

Flat belt drive

Gear drive

25. For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

None of the above

Otto cycle is more efficient than Diesel cycle

Both Otto cycle and Diesel cycle are equally efficient

26. The problems caused by the wheel imbalance are

Hard steering and hard ride

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

27. The petrol engines are also known as

Steam engines

None of these

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

28. The petrol engine works on

Otto cycle

Carnot cycle

Diesel cycle

Rankine cycle

29. In radial tyres

One ply layer runs diagonally one way and another layer runs diagonally the other way

None of these

All plies run parallel to one another and vertical to tyre bead

Inner tubes are always used

30. The maximum torque multiplication ratio in a torque converter is about

25

10

40

2.5

Automobile Engineering Practice Set-2

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