1 files changed, 42 insertions, 0 deletions
diff --git a/1092/CH12/EX12.3/Example12_3.sce b/1092/CH12/EX12.3/Example12_3.sce
new file mode 100755
index 000000000..dfcfc864a
--- /dev/null
+++ b/1092/CH12/EX12.3/Example12_3.sce
@@ -0,0 +1,42 @@
+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 12: POWER,ENERGY,AND EFFICIENCY RELATIONS OF DC AND AC DYNAMOS
+// Example 12-3
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+V = 240 ; // Voltage rating of the dc shunt motor in volt
+P_hp = 25 ; // Power rating of the dc shunt motor in hp
+S = 1800 ; // Speed in rpm of the shunt generator
+I_L = 89 ; // Full-load line current
+R_a = 0.05 ; // Armature resistance in ohm
+R_f = 120 ; // Field resistance in ohm
+
+// Calculations
+// case a
+V_f = V ; // Field voltage in volt
+I_f = V_f / R_f ; // Field current in A
+I_a = I_L - I_f  ; // Armature current in A
+V_a = V ;
+E_c = V_a - I_a*R_a ; // Armature voltage to be applied to the motor when motor 
+// is run light at 1800 rpm during stray power test
+
+// case b
+Ia = 4.2 ; // Armature current in A produced by E_c
+Va = E_c ; // Armature voltage in volt
+P_r = Va*Ia ; // Stray power in W ,when E_c produces I_a = 4.2 A at speed of 1800 rpm
+
+// Display the results
+disp("Example 12-3 Solution : ");
+
+printf(" \n a: Field current :\n    I_f = %d A \n ",I_f );
+printf(" \n    Armature current :\n    I_a = %d A \n ",I_a );
+printf(" \n    Armature voltage to be applied to the motor when motor is run");
+printf(" \n    light at %d rpm during stray power test :\n ",S );
+printf(" \n    E_c = %.2f V \n ",E_c );
+
+printf(" \n b: Stray power :\n    P_r = %.1f W ",P_r );