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

1.12

0.74

1.19

1.00

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

Engine can run

Fuel can be used in a test engine without knocking

Engine gives maximum output

Engine is most efficient

3. 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

Reduce the amount of sliding resistance

Improve the force transmission speed

Reduce the amount of noise generated

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

70

45

25

90

5. The starter motor is driven by

V-belt drive

Flat belt drive

Gear drive

Chain drive

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

8091 Nm

809.1 Nm

8.091 Nm

80.91 Nm

7. The petrol engines are also known as

Spark ignition (S.I.) engines

Steam engines

None of these

Compression ignition (C.I.) engines

8. 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

9. The compression ratio of a petrol engine is nearly

15:1

8:1

20:1

4:1

10. The positive plates of a lead acid battery has

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Page 2 of 3

11. 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 pure sulphuric acid

The electrolyte is pure distilled water

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

12. The torque converter uses ________ to transfer torque.

Automatic transmission fluid (ATF)

Steel belt

Air

Gears

13. For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

Otto cycle is more efficient than Diesel cycle

Both Otto cycle and Diesel cycle are equally efficient

None of the above

14. The formula for Iso-octane is

C7H18

C8H18

C7H17

C6H18

15. The rigid suspension is beneficial when

It is desired to reduce the unsprung mass

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

16. 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

17. In radial tyres

Inner tubes are always used

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

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

None of these

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

High rigidity

Better cooling efficiency

Smaller engine dimensions

None of these

19. The petrol engine works on

Carnot cycle

Rankine cycle

Otto cycle

Diesel cycle

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 fluid is more resistant to freezing than DOT 3 fluid

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

Page 3 of 3

21. The problems caused by the wheel imbalance are

Hard steering and hard ride

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

Poor acceleration and hard steering

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

Lower rolling resistance

None of these

Longer life

Smoother ride at low speeds

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

2000 volts

22 kilovolts

11 kilovolts

1000 volts

24. Thinner is added to the paint in order to

Optimise its viscosity

Make pigments and resin mix easily

None of these

Make paint film hard

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

0.5 mm

1 mm

1.5 mm

0.2 mm

26. 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

Axial force diagram

Valve timing diagram

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

Water jacket

Drain plug

Pressure cap

Vacuum valve

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

Camber

Caster

Toe in

Toe out

29. The acid used in automobile battery is

Nitric acid

Sulphuric acid

Hydrofluoric acid

Hydrochloric acid

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

2.5

40

10

25

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Tags: Automobile Automobile Engineering MCQs Engineering Mechanical Engineering

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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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