Engineering Thermodynamics
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

Zeroth law of thermodynamics
Second law of thermodynamics
First law of thermodynamics
Kelvin Planck's law

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Engineering Thermodynamics
According to Avogadro's Hypothesis

The sum of partial pressure of mixture of two gases is sum of the two
Product of the gas constant and the molecular weight of an ideal gas is constant
Gases have two values of specific heat
The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

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Engineering Thermodynamics
Which of the following is the correct statement?

All the reversible and irreversible engines have the same efficiency.
Irreversible engines have maximum efficiency.
All the reversible engines have the same efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.

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