Automobile Engineering Practice Set-2

Page 1 of 3

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

1.00

1.12

1.19

0.74

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

0.2 mm

1 mm

1.5 mm

0.5 mm

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

Toe in

Caster

Toe out

Camber

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

Fuel can be used in a test engine without knocking

Engine is most efficient

Engine can run

Engine gives maximum output

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

Water jacket

Drain plug

Pressure cap

Vacuum valve

7. Thinner is added to the paint in order to

Optimise its viscosity

None of these

Make pigments and resin mix easily

Make paint film hard

8. In radial tyres

None of these

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

Inner tubes are always used

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

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

600 cm³

1200 cm³

2400 cm³

400 cm³

10. 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 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

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

Page 2 of 3

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

Smoother ride at low speeds

Longer life

None of these

Lower rolling resistance

12. 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

809.1 Nm

80.91 Nm

8091 Nm

8.091 Nm

13. The acid used in automobile battery is

Hydrochloric acid

Nitric acid

Hydrofluoric acid

Sulphuric acid

14. The petrol engine works on

Rankine cycle

Carnot cycle

Diesel cycle

Otto cycle

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

Better cooling efficiency

None of these

Smaller engine dimensions

High rigidity

16. The formula for Iso-octane is

C7H17

C8H18

C6H18

C7H18

17. The petrol engines are also known as

None of these

Compression ignition (C.I.) engines

Spark ignition (S.I.) engines

Steam engines

18. The rigid suspension is beneficial when

It is desired to have more flexibility in design

It is desired to improve tyre to ground contact characteristics

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

It is desired to reduce the unsprung mass

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

45

90

70

25

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

2000 volts

1000 volts

11 kilovolts

22 kilovolts

Page 3 of 3

21. The torque converter uses ________ to transfer torque.

Gears

Air

Automatic transmission fluid (ATF)

Steel belt

22. The starter motor is driven by

Gear drive

Flat belt drive

Chain drive

V-belt drive

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

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 sulphuric acid

The electrolyte is pure distilled water

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

Vibrations on the steering wheel

Engine power during acceleration

Torque that is transmitted by the tyres to the road surface

Stopping distance in case of emergency

25. The compression ratio of a petrol engine is nearly

20:1

4:1

8:1

15:1

26. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

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

Valve timing diagram

Axial force diagram

Indicator diagram

None of these

28. The problems caused by the wheel imbalance are

Hard steering and hard ride

Poor acceleration and reduced fuel efficiency

Steering wheel vibrations and uneven tyre wear

Poor acceleration and hard steering

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

Reduce the amount of sliding resistance

Reduce the amount of noise generated

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

Improve the force transmission speed

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

2.5

10

25

40

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