Physics Test Preparations On Thermodynamics Part 1

Test Preparation on Physics Test Preparations On Thermodynamics Part 1

1.

The compression ratio for Diesel engines is

13 to 6
25 to 8
315 to 20
420 to 30

2.

In an isothermal process

1there is no change in temperature
2there is no change in enthalpy
3there is no change in internal energy
4all of these

3.

Which of the following is the correct statement of the second law of thermodynamics?

1It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
2It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.
3There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.
4all of the above

4.

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

1combustion is at constant volume
2expansion and compression are isentropic
3maximum temperature is higher
4heat rejection is lower

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