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

It is desired to reduce the unsprung mass

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

It is desired to have more flexibility in design

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

Smoother ride at low speeds

None of these

Lower rolling resistance

Longer life

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

0.2 mm

1 mm

0.5 mm

1.5 mm

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

1.12

0.74

1.00

1.19

5. The torque converter uses ________ to transfer torque.

Air

Steel belt

Automatic transmission fluid (ATF)

Gears

6. 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

7. 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

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

70

90

45

25

9. 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

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

None of these

Better cooling efficiency

High rigidity

Smaller engine dimensions

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

40

2.5

10

25

12. The petrol engines are also known as

Steam engines

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

13. 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 a mixture of 64% distilled water and 36% sulphuric acid by weight

The electrolyte is pure sulphuric acid

14. The compression ratio of a petrol engine is nearly

8:1

4:1

20:1

15:1

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

Reduce the amount of sliding resistance

Improve the force transmission speed

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

Reduce the amount of noise generated

16. 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

17. 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

Axial force diagram

Indicator diagram

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

Stopping distance in case of emergency

Vibrations on the steering wheel

Engine power during acceleration

Torque that is transmitted by the tyres to the road surface

19. The problems caused by the wheel imbalance are

Poor acceleration and hard steering

Steering wheel vibrations and uneven tyre wear

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

20. The petrol engine works on

Carnot cycle

Rankine cycle

Otto cycle

Diesel cycle

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21. The formula for Iso-octane is

C7H17

C7H18

C6H18

C8H18

22. The acid used in automobile battery is

Hydrofluoric acid

Hydrochloric acid

Nitric acid

Sulphuric acid

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

Drain plug

Pressure cap

Water jacket

Vacuum valve

24. The starter motor is driven by

Chain drive

Flat belt drive

V-belt drive

Gear drive

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

Toe out

Camber

Toe in

Caster

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

2400 cm³

400 cm³

1200 cm³

600 cm³

27. 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

809.1 Nm

8.091 Nm

28. Thinner is added to the paint in order to

Make pigments and resin mix easily

Make paint film hard

Optimise its viscosity

None of these

29. The positive plates of a lead acid battery has

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

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

2000 volts

1000 volts

11 kilovolts

22 kilovolts

Automobile Engineering Practice Set-2

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