Automobile Engineering Practice Set-2

Page 1 of 3

1. The positive plates of a lead acid battery has

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

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

Axial force diagram

None of these

Indicator diagram

Valve timing diagram

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

Engine can run

Engine is most efficient

Engine gives maximum output

Fuel can be used in a test engine without knocking

4. The starter motor is driven by

Gear drive

V-belt drive

Flat belt drive

Chain drive

5. The problems caused by the wheel imbalance are

Poor acceleration and hard steering

Hard steering and hard ride

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

6. 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

80.91 Nm

809.1 Nm

8091 Nm

8.091 Nm

7. The compression ratio of a petrol engine is nearly

20:1

4:1

15:1

8:1

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

1.00

0.74

1.12

1.19

9. The torque converter uses ________ to transfer torque.

Air

Gears

Steel belt

Automatic transmission fluid (ATF)

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

1 mm

0.5 mm

1.5 mm

0.2 mm

Page 2 of 3

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

Toe in

Caster

Camber

Toe out

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

45

90

25

70

13. The acid used in automobile battery is

Nitric acid

Hydrochloric acid

Hydrofluoric acid

Sulphuric acid

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

400 cm³

600 cm³

1200 cm³

2400 cm³

15. The petrol engine works on

Carnot cycle

Diesel cycle

Rankine cycle

Otto cycle

16. 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

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

Drain plug

Pressure cap

Vacuum valve

Water jacket

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

The electrolyte is pure sulphuric acid

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

The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

The electrolyte is pure distilled water

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

2000 volts

1000 volts

22 kilovolts

11 kilovolts

20. 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 fluids have a higher boiling point than DOT 3 fluid

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

Page 3 of 3

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

Smaller engine dimensions

High rigidity

Better cooling efficiency

None of these

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

Vibrations on the steering wheel

Stopping distance in case of emergency

Torque that is transmitted by the tyres to the road surface

Engine power during acceleration

23. The formula for Iso-octane is

C7H18

C7H17

C8H18

C6H18

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

40

2.5

25

10

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

Improve the force transmission speed

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

Reduce the amount of sliding resistance

Reduce the amount of noise generated

26. For the same maximum pressure and temperature

Both Otto cycle and Diesel cycle are equally efficient

Diesel cycle is more efficient than Otto cycle

Otto cycle is more efficient than Diesel cycle

None of the above

27. The rigid suspension is beneficial when

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

It is desired to have more flexibility in design

It is desired to improve tyre to ground contact characteristics

It is desired to reduce the unsprung mass

28. In radial tyres

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

None of these

29. 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

30. The petrol engines are also known as

None of these

Steam engines

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

Automobile Engineering Practice Set-2

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Automobile Engineering Practice Set-2

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection