From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 1938/CH3/EX3.28/3_28.sce | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100755 1938/CH3/EX3.28/3_28.sce

(limited to '1938/CH3/EX3.28/3_28.sce')

diff --git a/1938/CH3/EX3.28/3_28.sce b/1938/CH3/EX3.28/3_28.sce
new file mode 100755
index 000000000..b20cf5ef4
--- /dev/null
+++ b/1938/CH3/EX3.28/3_28.sce
@@ -0,0 +1,24 @@
+clc,clear
+printf('Example 3.28\n\n')
+
+V=500,P=1000*10^3,I=30
+I_a_m = 200 + 30 , I_a_g =200 //armature current for motor and generator
+I_sh_m = 1.8, I_sh_g =3.5 //field current for motor and generator
+brush_drop=230
+R_a=0.075  //armature resitance
+
+arm_cu_loss_m = R_a*I_a_m^2 + 2*brush_drop //motor armature copper loss
+field_cu_loss_m =V*I_sh_m  //  motor field copper loss 
+
+arm_cu_loss_g = R_a*I_a_g^2 + 2*brush_drop  //generator armature copper loss
+field_cu_loss_g =V*I_sh_g  //field copper loss generator
+
+total_cu_loss = field_cu_loss_g + arm_cu_loss_g  +  field_cu_loss_m + arm_cu_loss_m  //total copper loss for both machines
+P_aux = V*I  //power taken from auxillary supply
+stray_loss= P_aux - total_cu_loss  
+stray_loss_each = stray_loss/2  //stray loss for each machine
+
+total_loss_g = stray_loss_each + arm_cu_loss_g + field_cu_loss_g  //total loss in generator
+generator_output=V* I_a_g
+eta_g = 100*(generator_output/(generator_output + total_loss_g))//generator efficiency
+printf('Efficiency of generator is %.0f percent\n',eta_g)
-- 
cgit