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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-2

May 3, 2021

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1. The positive plates of a lead acid battery has

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

2. The petrol engines are also known as

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

None of these

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

Lower rolling resistance

Smoother ride at low speeds

None of these

Longer life

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

Torque that is transmitted by the tyres to the road surface

Stopping distance in case of emergency

Engine power during acceleration

Vibrations on the steering wheel

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

Vacuum valve

Drain plug

Pressure cap

Water jacket

6. The formula for Iso-octane is

C7H17

C8H18

C6H18

C7H18

7. The petrol engine works on

Rankine cycle

Carnot cycle

Otto cycle

Diesel cycle

8. 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

9. For the same maximum pressure and temperature

Both Otto cycle and Diesel cycle are equally efficient

None of the above

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

10. Thinner is added to the paint in order to

Make pigments and resin mix easily

None of these

Make paint film hard

Optimise its viscosity

Page 2 of 3

11. The rigid suspension is beneficial when

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 have more flexibility in design

It is desired to reduce the unsprung mass

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

Better cooling efficiency

None of these

Smaller engine dimensions

High rigidity

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

0.74

1.19

1.00

1.12

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

2.5

25

40

10

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

1200 cm³

600 cm³

400 cm³

2400 cm³

16. The compression ratio of a petrol engine is nearly

20:1

4:1

15:1

8:1

17. The acid used in automobile battery is

Hydrochloric acid

Hydrofluoric acid

Sulphuric acid

Nitric acid

18. 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 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

19. The problems caused by the wheel imbalance are

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

Hard steering and hard ride

Steering wheel vibrations and uneven tyre wear

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

Reduce the amount of sliding resistance

Improve the force transmission speed

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

Reduce the amount of noise generated

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21. 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

8.091 Nm

8091 Nm

809.1 Nm

22. In radial tyres

Inner tubes are always used

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

None of these

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

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

None of these

Indicator diagram

Valve timing diagram

Axial force diagram

24. The starter motor is driven by

Gear drive

Flat belt drive

Chain drive

V-belt drive

25. 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

26. 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

27. The torque converter uses ________ to transfer torque.

Gears

Steel belt

Air

Automatic transmission fluid (ATF)

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

Toe in

Camber

Caster

Toe out

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

2000 volts

1000 volts

11 kilovolts

22 kilovolts

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

45

70

25

90

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Tags: Automobile Automobile Engineering MCQs Engineering Mechanical Engineering

VideRime

A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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