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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-2

May 3, 2021

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

1000 volts

11 kilovolts

22 kilovolts

2000 volts

2. Thinner is added to the paint in order to

Make paint film hard

Make pigments and resin mix easily

None of these

Optimise its viscosity

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

25

45

70

90

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

Valve timing diagram

None of these

Indicator diagram

Axial force diagram

5. The acid used in automobile battery is

Nitric acid

Sulphuric acid

Hydrofluoric acid

Hydrochloric acid

6. The compression ratio of a petrol engine is nearly

15:1

8:1

4:1

20:1

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

The electrolyte is pure sulphuric acid

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

The electrolyte is pure distilled water

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

8. The problems caused by the wheel imbalance are

Poor acceleration and reduced fuel efficiency

Steering wheel vibrations and uneven tyre wear

Hard steering and hard ride

Poor acceleration and hard steering

9. The petrol engine works on

Diesel cycle

Carnot cycle

Otto cycle

Rankine cycle

10. 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

Page 2 of 3

11. In radial tyres

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

Inner tubes are always used

None of these

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

12. 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

13. The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics

It is desired to have more flexibility in design

It is desired to reduce the unsprung mass

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

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

None of these

Longer life

Smoother ride at low speeds

Lower rolling resistance

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

Smaller engine dimensions

High rigidity

Better cooling efficiency

None of these

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

Engine gives maximum output

Engine can run

Fuel can be used in a test engine without knocking

Engine is most efficient

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

400 cm³

1200 cm³

600 cm³

2400 cm³

18. The formula for Iso-octane is

C7H18

C6H18

C8H18

C7H17

19. 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

Reduce the amount of noise generated

Improve the force transmission speed

20. The positive plates of a lead acid battery has

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Page 3 of 3

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

809.1 Nm

8091 Nm

8.091 Nm

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

0.5 mm

0.2 mm

1 mm

1.5 mm

23. The torque converter uses ________ to transfer torque.

Steel belt

Air

Automatic transmission fluid (ATF)

Gears

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

10

2.5

40

25

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

1.12

1.19

1.00

0.74

26. The starter motor is driven by

Flat belt drive

Gear drive

V-belt drive

Chain drive

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

Vibrations on the steering wheel

Engine power during acceleration

Stopping distance in case of emergency

Torque that is transmitted by the tyres to the road surface

28. The petrol engines are also known as

Compression ignition (C.I.) engines

Steam engines

Spark ignition (S.I.) engines

None of these

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

Vacuum valve

Pressure cap

Water jacket

Drain plug

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

Toe out

Toe in

Camber

Caster

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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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