Example 8.12 

 PART (A)
 The first law efficiency is 96 percent
 The second law efficiency is 79 percent 

 PART (B)
 The first law efficiency is 90 percent
 The second law efficiency is 42.352941 percent 

 PART (C)
 The first law efficiency is 60 percent
 The second law efficiency is 4.411765  percent 

 PART (D)
 The First law efficiency for all the three cases would remain same and here is 90 percent
 The Second law efficiency of part (a) is 74.117647 percent
 The Second law efficiency of part (b) is 42.352941 percent
 The Second law efficiency of part (c) is 6.617647 percent