Engineering Thermodynamics
The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

Joule's law
Gay-Lussac law
Charle's law
Boyle's law

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Engineering Thermodynamics
An isolated system is one in which

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

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Engineering Thermodynamics
Which of the following is the correct statement?

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

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