Automobile Engineering Practice Set-2

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

None of these

Axial force diagram

Indicator diagram

Valve timing diagram

2. 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

Vibrations on the steering wheel

Engine power during acceleration

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

1.19

1.12

1.00

0.74

4. Thinner is added to the paint in order to

Make paint film hard

Optimise its viscosity

Make pigments and resin mix easily

None of these

5. The petrol engines are also known as

None of these

Steam engines

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

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

10

40

2.5

25

7. For the same maximum pressure and temperature

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

None of the above

Both Otto cycle and Diesel cycle are equally efficient

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

22 kilovolts

2000 volts

1000 volts

11 kilovolts

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

25

90

45

70

10. 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

80.91 Nm

8091 Nm

809.1 Nm

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11. The compression ratio of a petrol engine is nearly

8:1

15:1

4:1

20:1

12. In radial tyres

None of these

All plies run parallel to one another and vertical to tyre bead

Inner tubes are always used

One ply layer runs diagonally one way and another layer runs diagonally the other way

13. 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

14. The starter motor is driven by

Gear drive

Chain drive

Flat belt drive

V-belt drive

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

Smoother ride at low speeds

Lower rolling resistance

Longer life

None of these

16. The petrol engine works on

Diesel cycle

Carnot cycle

Rankine cycle

Otto cycle

17. The acid used in automobile battery is

Nitric acid

Sulphuric acid

Hydrochloric acid

Hydrofluoric acid

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

Toe out

Caster

Toe in

Camber

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

Smaller engine dimensions

High rigidity

Better cooling efficiency

None of these

20. 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

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21. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

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

1 mm

0.5 mm

0.2 mm

1.5 mm

23. The problems caused by the wheel imbalance are

Steering wheel vibrations and uneven tyre wear

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

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

2400 cm³

1200 cm³

400 cm³

600 cm³

25. 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

26. 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

It is desired to reduce the unsprung mass

Large changes in load make it necessary to have a large suspension stroke

27. The formula for Iso-octane is

C7H18

C6H18

C7H17

C8H18

28. The torque converter uses ________ to transfer torque.

Steel belt

Gears

Automatic transmission fluid (ATF)

Air

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

Vacuum valve

Water jacket

Drain plug

Pressure cap

30. 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

Automobile Engineering Practice Set-2

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