Engineering Thermodynamics
All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

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

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Engineering Thermodynamics
Which of the following is the correct statement?

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

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