1. 2. Which answer best describes the second law of thermodynamics as it is used

Question

1.

2.

Which answer best describes the second law of thermodynamics as it is used in Engineering Thermodynamics? The time rate of momentum contained within a control volume is equal to the net external force A) acting upon the control volume. The time rate of mass contained within a control volume is equal to the rate of mass entering the control volume minus the rate of mass leaving the control volume The time rate of change of energy contained within a control volume is equal to the rate of energy O C) entering the control volume via heat transfer minus the rate of energy leaving the control volume via work plus the rate of energy entering or exiting the control volume via mass transfer. The time rate of change of entropy contained within a control volume is equal to the rate of entropy O D) entering or exiting the control volume via heat transfer plus the rate of entropy entering or exiting the control volume via mass transfer plus the rate of entropy generated within the control volume

Explanation / Answer

Ans 1. D .

Second Law of Thermodynamics deals with entropy.

Ans 2 . B

At inlet at 0.1 bar g , water is saturated. Hence water tempertaure at inlet = 100 C. Now Pump does not increase temperature of liquid even when pressure of liquid rises. Also it is ideal pump, so temperature at outlet also = 100C

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