Automobile Engineering Practice Set-2

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1. 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

2. 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

3. 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

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

1000 volts

2000 volts

22 kilovolts

11 kilovolts

5. The torque converter uses ________ to transfer torque.

Automatic transmission fluid (ATF)

Steel belt

Air

Gears

6. The acid used in automobile battery is

Sulphuric acid

Hydrofluoric acid

Hydrochloric acid

Nitric acid

7. 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

8. The formula for Iso-octane is

C8H18

C6H18

C7H17

C7H18

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

1 mm

0.2 mm

1.5 mm

0.5 mm

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

The electrolyte is pure sulphuric acid

The electrolyte is pure distilled water

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

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

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

Torque that is transmitted by the tyres to the road surface

Vibrations on the steering wheel

Stopping distance in case of emergency

Engine power during acceleration

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

Smaller engine dimensions

Better cooling efficiency

High rigidity

None of these

13. 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

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

40

25

10

2.5

15. The petrol engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

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

600 cm³

1200 cm³

2400 cm³

400 cm³

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

Indicator diagram

None of these

Axial force diagram

Valve timing diagram

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

Engine is most efficient

Engine can run

Fuel can be used in a test engine without knocking

Engine gives maximum output

19. For the same maximum pressure and temperature

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

Both Otto cycle and Diesel cycle are equally efficient

None of the above

20. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

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21. The starter motor is driven by

V-belt drive

Gear drive

Chain drive

Flat belt drive

22. 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

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

Reduce the amount of noise generated

Reduce the amount of sliding resistance

Improve the force transmission speed

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

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

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

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

25. The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics

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

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

45

25

70

90

27. The compression ratio of a petrol engine is nearly

4:1

8:1

15:1

20:1

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

Pressure cap

Drain plug

Vacuum valve

Water jacket

29. The petrol engine works on

Diesel cycle

Otto cycle

Carnot cycle

Rankine cycle

30. In radial tyres

None of these

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

Automobile Engineering Practice Set-2

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