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diff --git a/1938/CH3/EX3.6/3_6.jpg b/1938/CH3/EX3.6/3_6.jpg
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diff --git a/1938/CH3/EX3.6/3_6.sce b/1938/CH3/EX3.6/3_6.sce
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+clc,clear
+printf('Example 3.6\n\n')
+
+I_a=37,I_sh=0.85//armature and field current for motor
+V=230
+R_a=0.33 //armature resistance
+
+I_a_g=30,I_sh_g=0.8//armature and field current for generator
+
+//for motor
+arm_cu_loss= I_a^2* R_a   //armature copper losses
+field_cu_loss=V*I_sh  //field copper loss
+total_cu_loss= field_cu_loss + arm_cu_loss //total copper loss 
+
+//for generator
+arm_cu_loss_g= I_a_g^2* R_a   //armature copper losses
+field_cu_loss_g=V*I_sh_g  //field copper loss
+total_cu_loss_g= field_cu_loss_g + arm_cu_loss_g //total copper loss
+
+//for motor-generator set
+total_cu_loss_set=   total_cu_loss_g + total_cu_loss
+P_supply=V*(I_a - I_a_g + I_sh+ I_sh_g ) //power taken from supply
+stray_loss= P_supply - (total_cu_loss_g + total_cu_loss) 
+stray_loss_each=  stray_loss/2   //stray loss for each machine
+
+//efficiency of motor
+motor_input = V*(I_a+I_sh)
+motor_output =  motor_input - (stray_loss_each + total_cu_loss)
+eta_m=  100* motor_output/motor_input //efficiency of motor
+printf('Efficiency of motor is %.2f percent \n',eta_m)
+//efficiency of generator
+generator_input = motor_output   //output of motor is input of generator
+generator_output =  generator_input - (stray_loss_each + total_cu_loss_g)
+eta_g=  100* generator_output/generator_input //efficiency of generator
+printf('Efficiency of generator is %.2f percent \n',eta_g)