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

---
 1445/CH8/EX8.30/Ex8_30.sce | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 1445/CH8/EX8.30/Ex8_30.sce

(limited to '1445/CH8/EX8.30')

diff --git a/1445/CH8/EX8.30/Ex8_30.sce b/1445/CH8/EX8.30/Ex8_30.sce
new file mode 100644
index 000000000..782ad08af
--- /dev/null
+++ b/1445/CH8/EX8.30/Ex8_30.sce
@@ -0,0 +1,26 @@
+//CHAPTER 8- DIRECT CURRENT MACHINES
+//Example 30
+
+disp("CHAPTER 8");
+disp("EXAMPLE 30");
+
+//Series DC motor 5 HP with 100 rpm
+//VARIABLE INITIALIZATION
+p=5*735.5;                 //in Watts (1 metric H.P.=735.5 W)
+N=1000;                    //in rpm, given as 100 rpm but solved as 1000 rpm in the text book
+                           //hence taken 1000 rpm
+I=30;                      //in Amperes
+I_s=45;                    //starting current in Amperes
+
+//SOLUTION
+T=(p*60)/(2*%pi*1000);     // Torque
+//Torque dir prop phi.Ia
+//=> since phi dir prop Ia
+//=> torque dir prop Ia^2
+// starting torque T_s / T = Starting current Ia ^2 / I^2
+T_s=(T*(I_s^2))/(I^2);
+disp(sprintf("The starting torque is %.0f N-m",T_s));
+
+//The answer is slightly different due to precision of floating point numbers
+
+//END 
-- 
cgit