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+//Finding efficiency
+//Example 15.35(pg. 416)
+clc
+clear
+m=2//quantity of aluminium to be melted in kg
+t1=15,t2=660//temp in degreeC
+S=0.212//specific heat of aluminium
+L=78.8//latent heat of aluminium in kcal/kg
+H=(m*S*(t2-t1))+(m*L)//total heat required to melt Al in kcal
+i=5//input to furnace in kW
+E=i*(1000*10*60)//Energy input to furnace in watt-sec
+E1=E/4180//energy input in kcal
+e=H*100/E1//efficiency of furnace
+printf('Thus the efficiency of furnace is %2.3f percent',e)