Automobile Engineering Practice Set-2

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1. The torque converter uses ________ to transfer torque.

Air

Automatic transmission fluid (ATF)

Steel belt

Gears

2. The petrol engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

3. The starter motor is driven by

Flat belt drive

Gear drive

V-belt drive

Chain drive

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

Water jacket

Pressure cap

Vacuum valve

Drain plug

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

Reduce the amount of noise generated

Improve the force transmission speed

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

Reduce the amount of sliding resistance

6. The formula for Iso-octane is

C8H18

C7H17

C7H18

C6H18

7. In radial tyres

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

Inner tubes are always used

None of these

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

8. Thinner is added to the paint in order to

Make pigments and resin mix easily

None of these

Make paint film hard

Optimise its viscosity

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

400 cm³

2400 cm³

1200 cm³

600 cm³

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

1.00

1.12

1.19

0.74

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11. The acid used in automobile battery is

Hydrofluoric acid

Hydrochloric acid

Sulphuric acid

Nitric acid

12. The problems caused by the wheel imbalance are

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

Steering wheel vibrations and uneven tyre wear

Poor acceleration and hard steering

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

70

90

45

25

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

10

40

25

2.5

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

Toe out

Toe in

Caster

Camber

16. The compression ratio of a petrol engine is nearly

15:1

8:1

20:1

4:1

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

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 higher boiling point than DOT 3 fluid

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

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

18. For the same maximum pressure and temperature

None of the above

Both Otto cycle and Diesel cycle are equally efficient

Diesel cycle is more efficient than Otto cycle

Otto cycle is more efficient than Diesel cycle

19. 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

8.091 Nm

809.1 Nm

8091 Nm

80.91 Nm

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

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

The electrolyte is pure distilled water

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

The electrolyte is pure sulphuric acid

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

1000 volts

22 kilovolts

11 kilovolts

2000 volts

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

Better cooling efficiency

Smaller engine dimensions

None of these

High rigidity

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

Valve timing diagram

Axial force diagram

None of these

Indicator diagram

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

Longer life

Smoother ride at low speeds

Lower rolling resistance

None of these

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

Stopping distance in case of emergency

Vibrations on the steering wheel

Torque that is transmitted by the tyres to the road surface

Engine power during acceleration

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

Fuel can be used in a test engine without knocking

Engine gives maximum output

Engine is most efficient

Engine can run

27. The rigid suspension is beneficial when

It is desired to have more flexibility in design

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

It is desired to improve tyre to ground contact characteristics

It is desired to reduce the unsprung mass

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

0.5 mm

1.5 mm

1 mm

0.2 mm

29. The petrol engine works on

Diesel cycle

Rankine cycle

Otto cycle

Carnot cycle

30. The positive plates of a lead acid battery has

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Automobile Engineering Practice Set-2

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