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

---
 608/CH21/EX21.18/21_18.sce | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 608/CH21/EX21.18/21_18.sce

(limited to '608/CH21/EX21.18/21_18.sce')

diff --git a/608/CH21/EX21.18/21_18.sce b/608/CH21/EX21.18/21_18.sce
new file mode 100755
index 000000000..d88fa62c6
--- /dev/null
+++ b/608/CH21/EX21.18/21_18.sce
@@ -0,0 +1,18 @@
+//Problem 21.18: The shaft torque of a diesel motor driving a 100 V d.c. shunt-wound generator is 25 Nm. The armature current of the generator is 16 A at this value of torque. If the shunt field regulator is adjusted so that the flux is reduced by 15%, the torque increases to 35 Nm. Determine the armature current at this new value of torque.
+
+//initializing the variables:
+T1 = 25; // in Nm
+T2 = 35; // in Nm
+Ia1 = 16; // in Amperes
+V = 100; // in Volts
+x = 0.15;
+
+//calculation:
+//the shaft torque T of a generator is proportional to (phi*Ia), where Phi is the flux and Ia is the armature current. Thus, T = k*Phi*Ia, where k is a constant.
+//The torque at flux phi1 and armature current Ia1 is T1 = k*Phi1*Ia1.
+//similarly T2 = k*Phi2*Ia2
+Phi2 = (1 - x)*Phi1
+Ia2 = T2*Ia1*Phi1/(Phi2*T1)
+
+printf("\n\n Result \n\n")
+printf("\n armature current at the new value of torque is %.2f A ",Ia2)
\ No newline at end of file
-- 
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