The air in the constant-pressure cylinder of Fig. 6.37 is initially at 400 8 C and 120

Question:

The air in the constant-pressure cylinder of Fig. 6.37 is initially at 400 8 C and 120 kPa. It is cooled until its temperature is 40 8 C. The surroundings are at 20 8 C. The entropy generated during this process is nearest:
(A) 0.463 kJ/kg ˆ™ K
(B) 0.591 kJ/kg ˆ™ K
(C) 0.766 kJ/kg ˆ™ K
(D) 1.229 kJ/kg ˆ™ K
Figure 6.37