Automobile Engineering Practice Set-2

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1. The problems caused by the wheel imbalance are

Poor acceleration and hard steering

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

Steering wheel vibrations and uneven tyre wear

2. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

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

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

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

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

Lower rolling resistance

None of these

Longer life

Smoother ride at low speeds

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

2000 volts

1000 volts

11 kilovolts

22 kilovolts

6. 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

7. For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

None of the above

Otto cycle is more efficient than Diesel cycle

Both Otto cycle and Diesel cycle are equally efficient

8. The starter motor is driven by

V-belt drive

Flat belt drive

Gear drive

Chain drive

9. 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

10. The torque converter uses ________ to transfer torque.

Steel belt

Gears

Air

Automatic transmission fluid (ATF)

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

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

The electrolyte is pure sulphuric acid

The electrolyte is pure distilled water

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

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

45

90

70

25

13. 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

14. 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

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

25

40

10

2.5

16. 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

17. Thinner is added to the paint in order to

Make paint film hard

Optimise its viscosity

Make pigments and resin mix easily

None of these

18. The petrol engines are also known as

Spark ignition (S.I.) engines

Steam engines

Compression ignition (C.I.) engines

None of these

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

None of these

Better cooling efficiency

High rigidity

Smaller engine dimensions

20. The formula for Iso-octane is

C7H18

C7H17

C6H18

C8H18

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

1.5 mm

0.2 mm

1 mm

0.5 mm

22. The petrol engine works on

Diesel cycle

Rankine cycle

Carnot cycle

Otto cycle

23. The acid used in automobile battery is

Hydrochloric acid

Nitric acid

Sulphuric acid

Hydrofluoric acid

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

Vacuum valve

Drain plug

Water jacket

Pressure cap

25. 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

809.1 Nm

8091 Nm

8.091 Nm

26. 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

27. The compression ratio of a petrol engine is nearly

20:1

15:1

8:1

4:1

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

1.19

1.12

0.74

1.00

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

2400 cm³

1200 cm³

600 cm³

400 cm³

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

None of these

Valve timing diagram

Indicator diagram

Axial force diagram

Automobile Engineering Practice Set-2

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