The maximum work produced by expanding 2 kg of steam in an insulated cylinder at 400°C and 4 MPa to 20 kPa is nearest:
A) 2120 kJ
B) 1890 kJ
C) 1780 kJ
D) 1640 kJ
D) 1640 kJ
An isentropic process produces maximum work so s2 = s1 = 6769 J/kg ?K
With P2 = 20 kPa, the 1st law provides (use the IRC Calculator):
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