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/CH2/EX2.34/2_34.jpg | Bin 0 -> 68068 bytes
 1938/CH2/EX2.34/2_34.sce |  19 +++++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100755 1938/CH2/EX2.34/2_34.jpg
 create mode 100755 1938/CH2/EX2.34/2_34.sce

(limited to '1938/CH2/EX2.34')

diff --git a/1938/CH2/EX2.34/2_34.jpg b/1938/CH2/EX2.34/2_34.jpg
new file mode 100755
index 000000000..59828e5f5
Binary files /dev/null and b/1938/CH2/EX2.34/2_34.jpg differ
diff --git a/1938/CH2/EX2.34/2_34.sce b/1938/CH2/EX2.34/2_34.sce
new file mode 100755
index 000000000..1486be271
--- /dev/null
+++ b/1938/CH2/EX2.34/2_34.sce
@@ -0,0 +1,19 @@
+clc,clear
+printf('Example 2.34\n\n')
+
+V=250, I_a1=20, R_a=0.5
+N_1=1000, N_2=500
+
+//T (prop.) I_a and T_1=T_2
+I_a2=I_a1
+E_b1 = V - I_a1*R_a
+
+//N (prop.) E_b
+E_b2= E_b1 *(N_2/N_1)
+R_x= (V-E_b2)/I_a2 - R_a   //because E_b2 = V - I_a2*(R_a+R_x)
+printf('Additional resistance = %.0f ohms',R_x)
+T3_by_T2=0.5   //torque is halved
+I_a3= I_a2 *(T3_by_T2)   //new armature current
+E_b3 = V - I_a3*(R_x + R_a)
+N_3=E_b3*N_2 / E_b2 //N (prop.) E_b
+printf('\nNew speed = %.3f rpm',N_3)
-- 
cgit