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diff --git a/2873/CH4/EX4.2/Ex4_2.sce b/2873/CH4/EX4.2/Ex4_2.sce
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+// Display mode
+mode(0);
+// Display warning for floating point exception
+ieee(1);
+clear;
+clc;
+disp("Engineering Thermodynamics by Onkar Singh Chapter 4 Example 2")
+T1=(400+273);//temperature of source in K
+T2=(15+273);//temperature of sink in K
+W=200;//work done in KJ
+disp("in carnot engine from thermodynamics temperature scale")
+disp("Q1/Q2=T1/T2")
+disp("W=Q1-Q2=200 KJ")
+disp("from above equations Q1 in KJ is given by")
+disp("Q1=(200*T1)/(T1-T2)")
+Q1=(200*T1)/(T1-T2)
+disp("and Q2 in KJ")
+disp("Q2=Q1-200")
+Q2=Q1-200
+disp("so heat supplied(Q1) in KJ")
+Q1