Automobile Engineering Practice Set-2

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1. For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

None of the above

Both Otto cycle and Diesel cycle are equally efficient

Otto cycle is more efficient than Diesel cycle

2. The rigid suspension is beneficial when

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

It is desired to have more flexibility in design

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

Torque that is transmitted by the tyres to the road surface

Engine power during acceleration

Stopping distance in case of emergency

Vibrations on the steering wheel

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

1200 cm³

600 cm³

2400 cm³

400 cm³

5. The petrol engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

6. The formula for Iso-octane is

C8H18

C7H17

C7H18

C6H18

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

Better cooling efficiency

Smaller engine dimensions

High rigidity

None of these

8. Thinner is added to the paint in order to

None of these

Make paint film hard

Make pigments and resin mix easily

Optimise its viscosity

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

40

2.5

10

25

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

Toe in

Camber

Toe out

Caster

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11. The compression ratio of a petrol engine is nearly

8:1

15:1

4:1

20:1

12. The petrol engine works on

Otto cycle

Carnot cycle

Rankine cycle

Diesel cycle

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

Drain plug

Vacuum valve

Water jacket

Pressure cap

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

1.12

0.74

1.19

1.00

15. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

16. 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

8091 Nm

8.091 Nm

80.91 Nm

809.1 Nm

17. The torque converter uses ________ to transfer torque.

Air

Steel belt

Automatic transmission fluid (ATF)

Gears

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

Engine is most efficient

Fuel can be used in a test engine without knocking

Engine gives maximum output

Engine can run

19. 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 distilled water

The electrolyte is pure sulphuric acid

20. 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

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21. The problems caused by the wheel imbalance are

Steering wheel vibrations and uneven tyre wear

Poor acceleration and hard steering

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

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

25

90

45

70

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

0.2 mm

0.5 mm

1 mm

1.5 mm

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 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

25. The acid used in automobile battery is

Hydrochloric acid

Sulphuric acid

Nitric acid

Hydrofluoric acid

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

Lower rolling resistance

None of these

Smoother ride at low speeds

Longer life

27. 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 noise generated

Reduce the amount of sliding resistance

28. The starter motor is driven by

Chain drive

Gear drive

V-belt drive

Flat belt drive

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

2000 volts

1000 volts

22 kilovolts

11 kilovolts

30. In radial tyres

None of these

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

Automobile Engineering Practice Set-2

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