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+//finding mass and energy
+//Example 15.5(pg 395)
+clc
+clear
+P=25//Output of diesel engine in kW
+s=12500//calorific value of fuel oil in k-cal/kgm
+e=0.35//overall efficiency of diesel set
+P1=P/e//input energy required in 1 hour in kWh
+P2=P1*860//input energy in kcal
+m=P2/s//mass of oil needed per hr in kgm
+w=1000//weight of 1 ton of oil in kgm
+Eg=(P*w)/m//Energy generated by 1ton of oil in kWh
+printf('(i)Mass of oil required per hr is %3.3f kgm \n',m)
+printf('(ii)Eletrical energy generated per ton of fuel is %4.1f Kwh',Eg)