Automobile Engineering Practice Set-2

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1. The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics

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 have more flexibility in design

2. The torque converter uses ________ to transfer torque.

Air

Gears

Automatic transmission fluid (ATF)

Steel belt

3. The compression ratio of a petrol engine is nearly

15:1

8:1

4:1

20:1

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

2.5

40

10

25

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

0.74

1.19

1.12

1.00

6. The petrol engines are also known as

Steam engines

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

None of these

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

1 mm

0.2 mm

0.5 mm

1.5 mm

8. The starter motor is driven by

Chain drive

V-belt drive

Gear drive

Flat belt drive

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

Lower rolling resistance

Longer life

None of these

Smoother ride at low speeds

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

Stopping distance in case of emergency

Engine power during acceleration

Vibrations on the steering wheel

Torque that is transmitted by the tyres to the road surface

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11. In radial tyres

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

Inner tubes are always used

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

None of these

12. 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

Indicator diagram

None of these

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

400 cm³

2400 cm³

600 cm³

1200 cm³

14. The formula for Iso-octane is

C7H18

C6H18

C8H18

C7H17

15. 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 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

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

70

90

45

25

17. The positive plates of a lead acid battery has

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

18. Thinner is added to the paint in order to

Optimise its viscosity

Make paint film hard

Make pigments and resin mix easily

None of these

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

Toe in

Toe out

Camber

Caster

20. 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

80.91 Nm

8091 Nm

8.091 Nm

809.1 Nm

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21. The petrol engine works on

Carnot cycle

Diesel cycle

Rankine cycle

Otto cycle

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

Engine gives maximum output

Engine can run

Engine is most efficient

Fuel can be used in a test engine without knocking

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

Reduce the amount of sliding resistance

Improve the force transmission speed

Reduce the amount of noise generated

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

24. 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 sulphuric acid

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

The electrolyte is pure distilled water

25. The problems caused by the wheel imbalance are

Hard steering and hard ride

Poor acceleration and hard steering

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

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

22 kilovolts

1000 volts

11 kilovolts

2000 volts

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

Water jacket

Vacuum valve

Drain plug

Pressure cap

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

Smaller engine dimensions

None of these

High rigidity

Better cooling efficiency

29. The acid used in automobile battery is

Sulphuric acid

Hydrofluoric acid

Nitric acid

Hydrochloric acid

30. For the same maximum pressure and temperature

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

None of the above

Automobile Engineering Practice Set-2

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