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/EX21.19/21_19.sce | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100755 608/CH21/EX21.19/21_19.sce

(limited to '608/CH21/EX21.19/21_19.sce')

diff --git a/608/CH21/EX21.19/21_19.sce b/608/CH21/EX21.19/21_19.sce
new file mode 100755
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+++ b/608/CH21/EX21.19/21_19.sce
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+//Problem 21.19: A 100 V d.c. generator supplies a current of 15 A when running at 1500 rev/min. If the torque on the shaft driving the generator is 12 Nm, determine (a) the efficiency of the generator and (b) the power loss in the generator.
+
+//initializing the variables:
+T = 12; // in Nm
+I = 15; // in Amperes
+V = 100; // in Volts
+n = 1500/60; // in rev/sec
+
+//calculation:
+//the efficiency of a generator = (output power/input power)*100 %
+//The output power is the electrical output, i.e. VI watts. The input power to a generator is the mechanical power in the shaft driving the generator, i.e. T*w or T(2*pi*n) watts, where T is the torque in Nm and n is speed of rotation in rev/s. Hence, for a generator 
+//efficiency = V*I*100/(T*2*pi*n)  %
+eff = V*I*100/(T*2*%pi*n) // in  Percent
+//The input power = output power + losses
+// hence, T*2*%pi*n = V*I + losses
+Pl = T*2*%pi*n - V*I
+
+printf("\n\n Result \n\n")
+printf("\n (a) efficiency is %.2f percent ",eff)
+printf("\n (b) power loss is %.0f W ",Pl)
\ No newline at end of file
-- 
cgit