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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 11: SPECIALIZED DYNAMOS
+// Example 11-1
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+// Torque - speed relations shown in Fig.11-3b for a dc servomotor.
+
+// Calculations
+// case a
+// Extrapolating to load line point x,
+S = 800 ; // Motor speed at point x
+V = 60 ; // Armature voltage in volt at point x
+
+// case b
+// At standstill, 60 V yields 4.5 lb-ft of starting torque
+T = 4.5 ;
+
+// case c
+P_c = (T*S)/5252 ; // Power delivered to the load in hp (from case a conditions)
+P_c_watt = P_c * 746 ; // P_c in W
+// case d
+// At point o:
+T_d = 1.1 ; // Starting torque in lb-ft (subscript d indicates case d) and
+S_d = 410 ; // Motor speed at point at point o
+
+// case e
+// At point w:
+T_e = 2.4 ; // Starting torque in lb-ft (subscript e indicates case e) and
+S_e = 900 ; // Motor speed at point at point w
+
+// case f
+P_d = (T_d*S_d)/5252 ; // Power delivered to the load in hp (from case d conditions)
+P_d_watt = P_d * 746 ; // P_d in W
+
+// case g
+P_f = (T_e*S_e)/5252 ; // Power delivered to the load in hp (from case f conditions)
+P_f_watt = P_f * 746 ; // P_f in W
+
+// case h
+// Upper limit of power ranges A and B are:
+A = 65 ; // Upper limit of power range A in W
+B = 305 ; // Upper limit of power range B in W
+
+// Display the results
+disp("Example 11-1 Solution : ");
+
+printf(" \n a: Extrapolating to load line point x,\n    S = %d rpm ",S);
+printf(" \n    Load line voltage is %d V \n",V);
+
+printf(" \n b: At standstill, %d V yields T = %.1f lb-ft of starting torque\n",V,T);
+
+printf(" \n c: Power delivered to the load in hp (from case a conditions)");
+printf(" \n    P = %.4f hp = %d W \n",P_c,P_c_watt);
+
+printf(" \n d: At point o:\n    T = %.1f lb-ft and S = %d rpm \n",T_d,S_d);
+
+printf(" \n e: At point w:\n    T = %.1f lb-ft and S = %d rpm \n",T_e,S_e);
+
+printf(" \n f: P = %.4f hp = %.1f W \n ",P_d,P_d_watt);
+
+printf(" \n g: P = %.4f hp = %.f W \n",P_f,P_f_watt );
+
+printf(" \n h: A = %d W  and  B = %d W ", A , B );