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

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

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

2. For the same maximum pressure and temperature

None of the above

Both Otto cycle and Diesel cycle are equally efficient

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

3. The formula for Iso-octane is

C7H17

C7H18

C6H18

C8H18

4. The rigid suspension is beneficial when

It is desired to reduce the unsprung mass

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

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

45

90

70

25

6. The compression ratio of a petrol engine is nearly

15:1

20:1

4:1

8:1

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

1000 volts

11 kilovolts

22 kilovolts

2000 volts

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

Vibrations on the steering wheel

Engine power during acceleration

Stopping distance in case of emergency

Torque that is transmitted by the tyres to the road surface

9. The petrol engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

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

Axial force diagram

Valve timing diagram

None of these

Indicator diagram

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11. 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

80.91 Nm

809.1 Nm

8091 Nm

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

The electrolyte is pure distilled water

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

The electrolyte is pure sulphuric acid

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

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

10

2.5

40

25

14. The torque converter uses ________ to transfer torque.

Automatic transmission fluid (ATF)

Gears

Air

Steel belt

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

None of these

Smaller engine dimensions

High rigidity

Better cooling efficiency

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

1.00

1.19

1.12

0.74

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

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

Reduce the amount of noise generated

Reduce the amount of sliding resistance

Improve the force transmission speed

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

2400 cm³

400 cm³

600 cm³

1200 cm³

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

Pressure cap

Drain plug

Water jacket

Vacuum valve

20. The problems caused by the wheel imbalance are

Poor acceleration and reduced fuel efficiency

Hard steering and hard ride

Steering wheel vibrations and uneven tyre wear

Poor acceleration and hard steering

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

1 mm

0.5 mm

0.2 mm

1.5 mm

22. The positive plates of a lead acid battery has

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

23. Thinner is added to the paint in order to

Make paint film hard

Make pigments and resin mix easily

Optimise its viscosity

None of these

24. The petrol engines are also known as

Spark ignition (S.I.) engines

Steam engines

None of these

Compression ignition (C.I.) engines

25. The acid used in automobile battery is

Nitric acid

Sulphuric acid

Hydrochloric acid

Hydrofluoric acid

26. The starter motor is driven by

Chain drive

V-belt drive

Flat belt drive

Gear drive

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

Caster

Toe out

Camber

Toe in

28. In radial tyres

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

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

Inner tubes are always used

None of these

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

Smoother ride at low speeds

Longer life

Lower rolling resistance

None of these

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

Engine gives maximum output

Engine is most efficient

Engine can run

Fuel can be used in a test engine without knocking

Automobile Engineering Practice Set-2

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