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

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

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Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

It is used as the alternate standard of comparison of all heat engines
It provides concept of maximising work output between the two temperature limits
All the heat engines are based on Carnot cycle
All of these

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Engineering Thermodynamics
According to Avogadro’s law

All of these
The sum of partial pressure of the mixture of two gases is sum of the two
Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
The product of the gas constant and the molecular mass of an ideal gas is constant

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Engineering Thermodynamics
First law of thermodynamics

Does not enable to determine change in entropy
All of these
Provides relationship between heat, work and internal energy
Enables to determine change in internal energy of the system

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