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diff --git a/3784/CH7/EX7.5/Ex7_5.sce b/3784/CH7/EX7.5/Ex7_5.sce
new file mode 100644
index 000000000..d5f3d4a86
--- /dev/null
+++ b/3784/CH7/EX7.5/Ex7_5.sce
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+clc 
+V= 100 //supply voltage in volts
+f=50 //frequency in Hz
+p=6 //number of poles
+Rs=0.6 //parameters in ohm 
+Rr=0.45 //parameters in ohm
+Xr=1.2 //parameters in ohm
+Xs=1.2 //parameters in ohm
+Xm=45 //parameters in ohm
+Sm=1
+R=0.4495 
+
+//solution
+Re=(((Rs^2)+(Xs+Xr)^2)*Sm-Rr) //external resistance in ohm
+Ns=1000
+N=poly(0,'N')
+a=1-(((((Rs^2)+(Xs+Xr)^2)*((Ns-N)/Ns)-Rr))/(4.5*R))
+printf('\n\n The Ratio of External Resistance=%0.1f\n\n',Re)
+disp(a,'Duty Ratio alpha is ')
+//The answer provided in the textbook is wrong