Automobile Engineering Practice Set-2

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1. 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

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

0.2 mm

1.5 mm

1 mm

0.5 mm

3. The acid used in automobile battery is

Sulphuric acid

Hydrochloric acid

Nitric acid

Hydrofluoric acid

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

2000 volts

1000 volts

11 kilovolts

22 kilovolts

5. The compression ratio of a petrol engine is nearly

20:1

8:1

15:1

4:1

6. The petrol engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

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

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 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

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

Improve the force transmission speed

Reduce the amount of noise generated

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

Reduce the amount of sliding resistance

9. In radial tyres

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

Inner tubes are always used

10. 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

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

Engine gives maximum output

Engine can run

Fuel can be used in a test engine without knocking

Engine is most efficient

12. The torque converter uses ________ to transfer torque.

Air

Automatic transmission fluid (ATF)

Steel belt

Gears

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

Longer life

None of these

Lower rolling resistance

Smoother ride at low speeds

14. 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 pure sulphuric acid

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

The electrolyte is pure distilled water

15. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

16. The starter motor is driven by

V-belt drive

Flat belt drive

Gear drive

Chain drive

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

Vacuum valve

Water jacket

Drain plug

Pressure cap

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

Indicator diagram

Valve timing diagram

None of these

Axial force diagram

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

High rigidity

Smaller engine dimensions

Better cooling efficiency

None of these

20. 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

80.91 Nm

809.1 Nm

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

45

90

25

70

22. The problems caused by the wheel imbalance are

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

Hard steering and hard ride

Poor acceleration and hard steering

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

400 cm³

2400 cm³

600 cm³

1200 cm³

24. 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

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

Stopping distance in case of emergency

Torque that is transmitted by the tyres to the road surface

Engine power during acceleration

Vibrations on the steering wheel

26. Thinner is added to the paint in order to

Optimise its viscosity

Make pigments and resin mix easily

None of these

Make paint film hard

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

10

40

2.5

25

28. The petrol engines are also known as

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

Steam engines

29. 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 improve tyre to ground contact characteristics

It is desired to reduce the unsprung mass

30. The formula for Iso-octane is

C7H18

C8H18

C7H17

C6H18

Automobile Engineering Practice Set-2

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