initial commit / add all books

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+// Calculating the kVA output of the machine

+clc;

+disp('Example 11.20, Page No. = 11.56')

+// Given Data

+// 3 phase turbo-alternator

+rpm = 3000;// R.p.m.

+f = 50;// Frequency (in Hz)

+L = 0.94;// Core length (in meter)

+Bav = 0.45;// Average gap density (in Wb per meter sqaure)

+ac = 25000;// Ampere conductors per meter

+Va = 100;// Peripheral speed of rotor (in meter per second)

+lg = 20;// Length of air gap (in mm)

+Kw = 0.95;// Winding factor

+// Winding is infinitely distributed with a phase spread of 60 degree

+// Calculation of the kVA output of the machine

+ns = rpm/60;// R.p.s

+Dr = Va/(%pi*ns);// Diameter of rotor (in meter)

+D = Dr+(2*lg*10^(-3));// Stator bore (in meter)

+// for full pitch

+Kd = 0.955;// Distribution factor

+Kp = 1;// Pitch factor

+Kw = Kd*Kp;// Winding factor

+Q = 11*Kw*Bav*ac*D*D*L*ns*10^(-3);// kVA output

+disp(Q,'(a) kVA output of machine (kVA)=');

+// for chorded by 1/3 pole pitch

+alpha = 180/3;// Angle of chording

+Kp = cos(alpha*%pi/180/2);// Pitch factor

+Kd = 0.955;// Distribution factor

+Kw = Kd*Kp;// Winding factor

+Q = 11*Kw*Bav*ac*D*D*L*ns*10^(-3);// kVA output

+disp(Q,'(b) kVA output of machine (kVA)=');

+//in book answers are 2480 kVA and 2147 kVA respectively.  The provided in the textbook is wrong