Automobile Engineering Practice Set-2

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

8091 Nm

8.091 Nm

809.1 Nm

80.91 Nm

22. The difference between DOT 3 and DOT 4 brake fluids is

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

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

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

23. In radial tyres

Inner tubes are always used

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

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

The electrolyte is pure distilled water

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

The electrolyte is pure sulphuric acid

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

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

Reduce the amount of sliding resistance

Reduce the amount of noise generated

Improve the force transmission speed

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

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

High rigidity

Smaller engine dimensions

None of these

Better cooling efficiency

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

90

70

45

25

28. The petrol engines are also known as

Steam engines

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

29. The petrol engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

30. 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 is most efficient

Engine gives maximum output

Automobile Engineering Practice Set-2

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