Engineering Thermodynamics
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called

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

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