Engineering Thermodynamics
An isolated system is one in which

Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so

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Engineering Thermodynamics
According to Avogadro’s law

The sum of partial pressure of the mixture of two gases is sum of the two
All of these
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
The work ratio of a gas turbine plant is given by

(Net work output)/(Work-done by the turbine)
(Actual temperature drop)/(Isentropic temperature drop)
(Net work output)/(Heat supplied)
(Isentropic increase in temperature)/(Actual increase in temperature)

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