Automobile Engineering Practice Set-2

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1. 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

Improve the force transmission speed

Reduce the amount of sliding resistance

Reduce the amount of noise generated

2. The starter motor is driven by

Chain drive

V-belt drive

Gear drive

Flat belt drive

3. The acid used in automobile battery is

Hydrochloric acid

Sulphuric acid

Nitric acid

Hydrofluoric acid

4. The compression ratio of a petrol engine is nearly

15:1

20:1

8:1

4:1

5. The formula for Iso-octane is

C8H18

C6H18

C7H17

C7H18

6. 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 lower boiling point than DOT 3 fluid

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

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

7. 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

8. The petrol engine works on

Otto cycle

Rankine cycle

Carnot cycle

Diesel cycle

9. 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

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

None of these

Better cooling efficiency

Smaller engine dimensions

High rigidity

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11. The problems caused by the wheel imbalance are

Poor acceleration and hard steering

Poor acceleration and reduced fuel efficiency

Hard steering and hard ride

Steering wheel vibrations and uneven tyre wear

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

45

70

90

25

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

40

2.5

10

25

14. 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

8.091 Nm

80.91 Nm

8091 Nm

15. For the same maximum pressure and temperature

Both Otto cycle and Diesel cycle are equally efficient

Diesel cycle is more efficient than Otto cycle

None of the above

Otto cycle is more efficient than Diesel cycle

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

11 kilovolts

1000 volts

2000 volts

22 kilovolts

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

1 mm

1.5 mm

0.2 mm

0.5 mm

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

Toe in

Camber

Caster

Toe out

19. 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

20. The rigid suspension is beneficial when

It is desired to have more flexibility in design

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 improve tyre to ground contact characteristics

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

None of these

Longer life

Lower rolling resistance

Smoother ride at low speeds

22. The positive plates of a lead acid battery has

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

23. In radial tyres

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

None of these

Inner tubes are always used

24. The torque converter uses ________ to transfer torque.

Air

Automatic transmission fluid (ATF)

Steel belt

Gears

25. Thinner is added to the paint in order to

None of these

Optimise its viscosity

Make pigments and resin mix easily

Make paint film hard

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

1.00

0.74

1.19

1.12

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

Torque that is transmitted by the tyres to the road surface

Stopping distance in case of emergency

Vibrations on the steering wheel

Engine power during acceleration

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

Drain plug

Pressure cap

Water jacket

Vacuum valve

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

Fuel can be used in a test engine without knocking

Engine gives maximum output

Engine is most efficient

Engine can run

30. The petrol engines are also known as

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

Steam engines

None of these

Automobile Engineering Practice Set-2

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