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+clc;
+// Answer for case c , secondary line voltage is given wrong in book
+k=12; // per phase turns ratio
+E1=11000; // supply voltage from feeder line
+ip=20; // primary line current
+disp('case a:star-delta');
+vph=E1/sqrt(3); // primary phase voltage
+iph=ip; // phase current on primary
+sph=vph/k; // secondary phase voltage
+vls=sph;
+printf('Line voltage on secondary is %f v\n',vls);
+isph=k*iph; // phase current on secondary
+isl=sqrt(3)*isph;
+printf('line current on secondary is %f A\n',isl);
+Kv=(3*sph*isph)/1000;
+printf('Output KVA is %f KVA\n',Kv);
+disp('case b:delta-star');
+vph=E1; // primary phase voltage
+iph=ip/sqrt(3); // phase current on primary
+sph=vph/k; // secondary phase voltage
+vls=sqrt(3)*sph;
+printf('Line voltage on secondary is %f v\n',vls);
+isph=k*iph; // phase current on secondary
+isl=isph;
+printf('line current on secondary is %f A\n',isl);
+Kv=(3*sph*isph)/1000;
+printf('Output KVA is %f KVA\n',Kv);
+disp('case c:delta-delta');
+vph=E1; // primary phase voltage
+iph=ip/sqrt(3); // phase current on primary
+sph=vph/k; // secondary phase voltage
+vls=sph;
+printf('Line voltage on secondary is %f v\n',vls);
+isph=k*iph; // phase current on secondary
+isl=sqrt(3)*isph;
+printf('line current on secondary is %f A\n',isl);
+Kv=(3*sph*isph)/1000;
+printf('Output KVA is %f KVA\n',Kv);
+disp('case d:star-star');
+vph=E1/sqrt(3); // primary phase voltage
+iph=ip; // phase current on primary
+sph=vph/k; // secondary phase voltage
+vls=sqrt(3)*sph;
+printf('Line voltage on secondary is %f v\n',vls);
+isph=k*iph; // phase current on secondary
+isl=isph;
+printf('line current on secondary is %f A\n',isl);
+Kv=(3*sph*isph)/1000;
+printf('Output KVA is %f KVA\n',Kv);