Engineering Thermodynamics
If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

Throttling
Adiabatic expansion
Hyperbolic expansion
Free expansion

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle

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