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diff --git a/3640/CH3/EX3.13/Ex3_13.sce b/3640/CH3/EX3.13/Ex3_13.sce
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index 000000000..e3565df9f
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+clc
+SB=300 //rating in kVA at full load
+S=150 //kVA at half load
+Phe=2.7 //core loss in kW
+Phepu=Phe/SB //ans may vary due to roundoff error
+mprintf("Phepu=%f\n",Phepu)
+Reqpu=0.0140 //per unit resistance in ohms=per unit copper loss at full load in watts
+pf=0.9 //power factor at full load
+//efficiency at full load
+mprintf("ηfl=%f\n",pf/(pf+Phepu+Reqpu))//ans may vary due to roundoff error
+//efficiency at half load
+a=S/SB //ratio of kVA at half and full load
+mprintf("ηfl=%f\n",(a*pf)/((a*pf)+Phepu+(a*a*Reqpu)))//ans may vary due to roundoff error
+//for max efficiency
+mprintf("|S|/SB=sqrt(Phepu/Reqpu)=%fA\n",sqrt(Phepu/Reqpu))//ans may vary due to roundoff error
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