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+// Ex 39 Page 383
+
+clc;clear;close;
+// Given
+VL=250;//V
+Is=50;//A
+Ia=380;//A
+If1=5;//A
+If2=4.2;//A
+ra=0.02;//ohm
+
+//Machine Losses:
+ma_cu_loss=Ia**2*ra;//W (motor armature cu loss)
+ga_cu_loss=(Ia-Is)**2*ra;//W (generator armature cu loss)
+P=VL*Is;//W
+stray_loss=P-ma_cu_loss-ga_cu_loss;//W
+stray_loss_per_machine=stray_loss/2;//W
+
+//Motor efficiency
+field_cu_loss=VL*If2;//W
+total_loss=ma_cu_loss+field_cu_loss+stray_loss_per_machine;//W
+Pin_motor=(VL*Ia)+(VL*ra);//W
+Pout_motor=Pin_motor-total_loss;//W
+Eff=Pout_motor/Pin_motor*100;//%
+printf("Motor efficiency = %.f percent",Eff)
+
+
+//Generator efficiency
+field_cu_loss=VL*If1;//W
+total_loss=ga_cu_loss+field_cu_loss+stray_loss_per_machine;//W
+Pout_generator=VL*(Ia-Is);//W
+Pin_generator=Pout_generator+total_loss;//W
+Eff=Pout_motor/Pin_motor*100;//%
+printf("\n Generator efficiency = %.f percent",Eff)
+
+
+
+