Automobile Engineering Practice Set-2

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

1.5 mm

0.2 mm

0.5 mm

1 mm

2. The compression ratio of a petrol engine is nearly

8:1

4:1

20:1

15:1

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

None of these

Smoother ride at low speeds

Lower rolling resistance

Longer life

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

Improve the force transmission speed

Reduce the amount of noise generated

Reduce the amount of sliding resistance

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

5. In radial tyres

Inner tubes are always used

None of these

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

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

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

The electrolyte is pure distilled water

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

Camber

Toe out

Caster

Toe in

8. Thinner is added to the paint in order to

Make pigments and resin mix easily

Optimise its viscosity

Make paint film hard

None of these

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

None of these

Indicator diagram

Axial force diagram

Valve timing diagram

10. The formula for Iso-octane is

C8H18

C6H18

C7H18

C7H17

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11. 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 can run

Engine is most efficient

12. The torque converter uses ________ to transfer torque.

Automatic transmission fluid (ATF)

Gears

Air

Steel belt

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

25

10

40

2.5

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

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

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

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

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

Water jacket

Drain plug

Pressure cap

Vacuum valve

16. The petrol engines are also known as

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

None of these

17. 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

Engine power during acceleration

Stopping distance in case of emergency

18. 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

19. The petrol engine works on

Diesel cycle

Otto cycle

Carnot cycle

Rankine cycle

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

70

25

45

90

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21. The starter motor is driven by

Gear drive

Flat belt drive

Chain drive

V-belt drive

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

Smaller engine dimensions

None of these

High rigidity

Better cooling efficiency

23. For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

Otto cycle is more efficient than Diesel cycle

Both Otto cycle and Diesel cycle are equally efficient

None of the above

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

400 cm³

2400 cm³

1200 cm³

600 cm³

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

8.091 Nm

8091 Nm

809.1 Nm

80.91 Nm

26. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

27. The problems caused by the wheel imbalance are

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

Steering wheel vibrations and uneven tyre wear

28. The acid used in automobile battery is

Hydrochloric acid

Sulphuric acid

Hydrofluoric acid

Nitric acid

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

1.12

1.19

1.00

0.74

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

1000 volts

22 kilovolts

11 kilovolts

2000 volts

Automobile Engineering Practice Set-2

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