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diff --git a/3760/CH4/EX4.82/Ex4_82.sce b/3760/CH4/EX4.82/Ex4_82.sce
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+clc;
+// plot for open circuit characteristics is given in fig 4.10
+IF=[ 0 11.5 23 36.5 59.5 79 110 160];
+EA=[0 40 80 120 160 180 200 220 ];
+subplot(221);
+plot(IF,EA);
+xlabel('field ATs');
+ylabel('voltage');
+title('magnetising curve');
+nf=800; // field winding turns
+rd=0.5; // total armature resistance along d-axis
+ifl=0.2; // field winding current
+d=10; // product of (difference between mmf of compensating winding and armature mmf along d-circuit)and load current 
+nf1=nf*ifl; // field winding turns for field current of 200mA
+il=nf1/d; // maximum load current
+printf('Maximum field current is %d A\n',il);
+IL=[0 2 4 6 8 10 12 14 16]; // load currents
+ATD=nf1-d*IL; // net d-axis ATs
+disp('Net d-axis ATs is');
+disp(ATD);
+// corresponding to each ATD open circuit EMF is obtained from magnetising curve
+EO=[220 213 204.7 194 180.5 161.4 128 70 0 ]; // open circuit EMF
+VRD=rd*IL; // d-axis resistance drop
+VO=EO-VRD; 
+disp('Output voltage(V) is ');
+disp(VO);
+subplot(222);
+plot(IL,VO);
+xlabel('load current(A)');
+ylabel('Output voltage(v)');
+title('Output voltage vs Load current');