Automobile Engineering Practice Set-2

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

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

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

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

Lower rolling resistance

Smoother ride at low speeds

Longer life

None of these

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

Reduce the amount of sliding resistance

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

Improve the force transmission speed

Reduce the amount of noise generated

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

0.74

1.12

1.00

1.19

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

Better cooling efficiency

None of these

Smaller engine dimensions

High rigidity

6. The acid used in automobile battery is

Hydrochloric acid

Hydrofluoric acid

Sulphuric acid

Nitric acid

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

The electrolyte is pure sulphuric acid

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

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

The electrolyte is pure distilled water

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

Engine power during acceleration

Vibrations on the steering wheel

Torque that is transmitted by the tyres to the road surface

Stopping distance in case of emergency

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

90

70

45

25

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

40

10

25

2.5

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11. The compression ratio of a petrol engine is nearly

4:1

15:1

8:1

20:1

12. Thinner is added to the paint in order to

Make pigments and resin mix easily

None of these

Optimise its viscosity

Make paint film hard

13. The petrol engines are also known as

Steam engines

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

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

400 cm³

600 cm³

2400 cm³

1200 cm³

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

2000 volts

22 kilovolts

1000 volts

11 kilovolts

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

Indicator diagram

None of these

Valve timing diagram

Axial force diagram

18. 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 reduce the unsprung mass

It is desired to improve tyre to ground contact characteristics

19. For the same maximum pressure and temperature

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

None of the above

Both Otto cycle and Diesel cycle are equally efficient

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

Fuel can be used in a test engine without knocking

Engine is most efficient

Engine gives maximum output

Engine can run

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21. The positive plates of a lead acid battery has

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

22. The starter motor is driven by

Flat belt drive

Chain drive

Gear drive

V-belt drive

23. The formula for Iso-octane is

C6H18

C7H18

C7H17

C8H18

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

0.2 mm

1.5 mm

1 mm

0.5 mm

25. The torque converter uses ________ to transfer torque.

Gears

Air

Automatic transmission fluid (ATF)

Steel belt

26. The petrol engine works on

Otto cycle

Diesel cycle

Carnot cycle

Rankine cycle

27. In radial tyres

Inner tubes are always used

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

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

None of these

28. 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

8.091 Nm

80.91 Nm

809.1 Nm

29. The problems caused by the wheel imbalance are

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

Hard steering and hard ride

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

Water jacket

Drain plug

Vacuum valve

Pressure cap

Automobile Engineering Practice Set-2

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