Automobile Engineering Practice Set-2

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1. The rigid suspension is beneficial when

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

It is desired to improve tyre to ground contact characteristics

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

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

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

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

Fuel can be used in a test engine without knocking

Engine can run

Engine gives maximum output

Engine is most efficient

4. The positive plates of a lead acid battery has

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

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

2000 volts

11 kilovolts

22 kilovolts

1000 volts

6. The problems caused by the wheel imbalance are

Poor acceleration and hard steering

Poor acceleration and reduced fuel efficiency

Steering wheel vibrations and uneven tyre wear

Hard steering and hard ride

7. 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

8. The petrol engine works on

Rankine cycle

Otto cycle

Carnot cycle

Diesel cycle

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

Vibrations on the steering wheel

Stopping distance in case of emergency

Torque that is transmitted by the tyres to the road surface

Engine power during acceleration

10. The acid used in automobile battery is

Nitric acid

Sulphuric acid

Hydrofluoric acid

Hydrochloric acid

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

Drain plug

Water jacket

Vacuum valve

Pressure cap

12. The torque converter uses ________ to transfer torque.

Gears

Air

Steel belt

Automatic transmission fluid (ATF)

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

Toe out

Caster

Camber

Toe in

14. For the same maximum pressure and temperature

Otto cycle is more efficient than Diesel cycle

Both Otto cycle and Diesel cycle are equally efficient

Diesel cycle is more efficient than Otto cycle

None of the above

15. 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 sliding resistance

Reduce the amount of noise generated

Improve the force transmission speed

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

Indicator diagram

Axial force diagram

None of these

Valve timing diagram

17. 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

18. The formula for Iso-octane is

C7H18

C7H17

C8H18

C6H18

19. The petrol engines are also known as

None of these

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

Steam engines

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

High rigidity

Better cooling efficiency

None of these

Smaller engine dimensions

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21. The starter motor is driven by

Chain drive

Gear drive

V-belt drive

Flat belt drive

22. 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

809.1 Nm

80.91 Nm

8.091 Nm

8091 Nm

23. Thinner is added to the paint in order to

None of these

Optimise its viscosity

Make paint film hard

Make pigments and resin mix easily

24. 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

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

70

45

25

90

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

None of these

Lower rolling resistance

Longer life

Smoother ride at low speeds

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

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 higher boiling point than DOT 3 fluid

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

28. The compression ratio of a petrol engine is nearly

15:1

20:1

4:1

8:1

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

10

25

40

2.5

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

1200 cm³

400 cm³

2400 cm³

600 cm³

Automobile Engineering Practice Set-2

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