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+clc;
+// table is given in question for plotting magnetising curve
+if1=[ 0 0.2 0.4 0.6 1 1.4 1.8 2 ];
+Ea=[ 6 40 80 120 194 246 269 274];
+plot(if1,Ea);
+xlabel('If');
+ylabel('Ea');
+title('magnetising curve')
+v=230; // rated voltage of generator
+p=10000; // rated power of generator
+n=1500; // rated speed of generator
+rf=184; // shunt field resistance
+ra=0.443; // armature resistance
+ifl=1.7; // rated field current
+il=p/v; // full load current
+printf('Total armature current is %f A\n',il+ifl);
+printf('Armature resistance drop is %f ohms\n',(il+ifl)*ra);
+disp('In fig 4.17(textbook),AB is made equal to armature resistance drop then through B a horizontal line is made meeting curve at c');
+disp('Demagnetising effect is given by BC which is equal to 0.25 A');