From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

---
 3760/CH4/EX4.55/Ex4_55.sce | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 3760/CH4/EX4.55/Ex4_55.sce

(limited to '3760/CH4/EX4.55')

diff --git a/3760/CH4/EX4.55/Ex4_55.sce b/3760/CH4/EX4.55/Ex4_55.sce
new file mode 100644
index 000000000..e294b6705
--- /dev/null
+++ b/3760/CH4/EX4.55/Ex4_55.sce
@@ -0,0 +1,22 @@
+clc;
+v=250; // rated voltage of dc series motor
+ra=0.25; // armature resistance
+rf=0.15; // series field resistance
+disp('case a');
+t=80; // developed torque
+n1=1200; // speed at developed torque
+// solving quadratic equation in ia
+t1=ra+rf;
+t2=-v;
+t3=(t*2*%pi*n1)/60;
+p=[ t1 t2 t3];
+ia=roots(p);
+printf('Current for developing given torque is %f A\n',ia(2));
+disp('case b');
+n2=1800; 
+ia2=ia(2)/2; 
+Ea1=v-ia(2)*(ra+rf); // counter EMF corresponding to armature current of case 1
+Ea2=v-ia2*(ra+rf); // counter EMF corresponding to armature current ia2
+fr=(n1*Ea2)/(n2*Ea1); // ratio of fluxes for two armatures current
+pr=(1-fr)*100;
+printf('Percentage reduction in flux is %f pecent',pr);
-- 
cgit