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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-2

May 3, 2021

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

Smaller engine dimensions

None of these

High rigidity

Better cooling efficiency

2. The problems caused by the wheel imbalance are

Hard steering and hard ride

Poor acceleration and hard steering

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

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

Improve the force transmission speed

Reduce the amount of sliding resistance

Reduce the amount of noise generated

4. The compression ratio of a petrol engine is nearly

8:1

4:1

20:1

15:1

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

25

45

90

70

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

2000 volts

1000 volts

22 kilovolts

11 kilovolts

7. 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

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

Water jacket

Pressure cap

Drain plug

Vacuum valve

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

25

10

2.5

40

10. 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

Page 2 of 3

11. The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics

It is desired to reduce the unsprung mass

It is desired to have more flexibility in design

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

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

Axial force diagram

Indicator diagram

Valve timing diagram

None of these

13. The torque converter uses ________ to transfer torque.

Automatic transmission fluid (ATF)

Gears

Steel belt

Air

14. 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

15. 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

16. The petrol engine works on

Carnot cycle

Diesel cycle

Rankine cycle

Otto cycle

17. The petrol engines are also known as

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

Steam engines

18. The starter motor is driven by

Chain drive

Gear drive

V-belt drive

Flat belt drive

19. The acid used in automobile battery is

Hydrofluoric acid

Hydrochloric acid

Sulphuric acid

Nitric acid

20. In radial tyres

None of these

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

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

Inner tubes are always used

Page 3 of 3

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

1.19

1.00

1.12

0.74

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

Stopping distance in case of emergency

Torque that is transmitted by the tyres to the road surface

Vibrations on the steering wheel

Engine power during acceleration

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

Smoother ride at low speeds

Lower rolling resistance

Longer life

None of these

24. 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 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

25. 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

26. The positive plates of a lead acid battery has

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

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

1 mm

0.2 mm

0.5 mm

1.5 mm

28. The formula for Iso-octane is

C6H18

C7H17

C7H18

C8H18

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

600 cm³

400 cm³

1200 cm³

2400 cm³

30. Thinner is added to the paint in order to

Make paint film hard

None of these

Make pigments and resin mix easily

Optimise its viscosity

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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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