An ideal gas has CP* = 5R. It enters a adiabatic compressor at P = 0.1 MPa and T = 300 K. If the exiting pressure is 0.6 MPa and the efficiency of the compressor is 80%, what is the temperature of the exiting gas?

A. 103 K
B. 429 K
C. 403 K
D. 461 K
E. Insufficient information to solve


A. Incorrect. The temperature should increase as energy is added.
B. Incorrect. This is the temperature of a reversible compressor at these conditions.
C. Incorrect. You probably misapplied the efficiency. Review the definition of efficiency on page 169.
D. Correct. Using Equation 4.59 to get the reversible turbine conditions, you can then apply the efficiency and calculate back to the real conditions.
E. Incorrect. This problem CAN be solved.

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