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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-2

May 3, 2021

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Page 1 of 3

1. In radial tyres

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

Inner tubes are always used

2. 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 reduce the unsprung mass

It is desired to have more flexibility in design

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

Toe out

Camber

Toe in

Caster

4. The starter motor is driven by

Gear drive

Flat belt drive

Chain drive

V-belt drive

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

The electrolyte is pure distilled water

The electrolyte is pure sulphuric acid

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

6. The positive plates of a lead acid battery has

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

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

Vacuum valve

Drain plug

Water jacket

Pressure cap

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

2.5

10

40

25

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

90

45

70

25

10. The torque converter uses ________ to transfer torque.

Gears

Steel belt

Air

Automatic transmission fluid (ATF)

Page 2 of 3

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

None of these

Valve timing diagram

Axial force diagram

Indicator diagram

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

Fuel can be used in a test engine without knocking

Engine can run

Engine gives maximum output

Engine is most efficient

13. The acid used in automobile battery is

Sulphuric acid

Hydrochloric acid

Hydrofluoric acid

Nitric acid

14. 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

15. 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

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

High rigidity

Smaller engine dimensions

Better cooling efficiency

None of these

17. For the same maximum pressure and temperature

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

Both Otto cycle and Diesel cycle are equally efficient

None of the above

18. The compression ratio of a petrol engine is nearly

15:1

8:1

4:1

20:1

19. 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

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 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

Page 3 of 3

21. The petrol engines are also known as

None of these

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

22. 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

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

1.00

1.12

0.74

1.19

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

Longer life

Lower rolling resistance

None of these

Smoother ride at low speeds

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

1.5 mm

1 mm

0.2 mm

0.5 mm

26. 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

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

22 kilovolts

11 kilovolts

2000 volts

1000 volts

28. The petrol engine works on

Carnot cycle

Otto cycle

Diesel cycle

Rankine cycle

29. The problems caused by the wheel imbalance are

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

Hard steering and hard ride

30. The formula for Iso-octane is

C7H18

C8H18

C7H17

C6H18

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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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