An open system is one in which

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📊 Engineering Thermodynamics

Q. An open system is one in which

(A) heat & work cross the boundary of the system, but the mass of the working substance does not
(B) mass of working substance crosses the boundary of the system but the heat & work do not
(C) both the heat & work as well as mass of the working substance cross the boundary of the system
(D) neither the heat & work nor the mass of the working substances cross the boundary of the system

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✅ Correct Answer: (C) both the heat & work as well as mass of the working substance cross the boundary of the system

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