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​Air inside a rigid, thermally-insulated tank undergoes stirring as shown in the figure below. Which one of the following options is correct?

  1. The enthalpy of the air increases while the entropy of the air remains constant
  2. Both the enthalpy and the entropy of the air remain constant
  3. Both the enthalpy and the entropy of the air increase
  4. The enthalpy of the air decreases while the entropy of the air increases

1 Answer

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The close system work will be zero as the change in volume is zero. Only work will be the shaft work. And DQ will be zero so the change in internal energy will result in the increase in temperature of the system. 

 

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