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+//Control of DC motors//
+//Example 11.2//
+Vdc=440;//Rated dc voltage in volts//
+Edca=Vdc+Vdc/10;//Required voltage after allowing 10% drop//
+printf('Required voltage after allowing 10percent drop=Edca=%fvolts',Edca);
+Edc=1.35*415;
+C=Edca/Edc;
+printf('\nCosine of the locked angle=C=%f',C);
+A=acos(C)*180/%pi;//locked angle in degrees//
+printf('\nConverter shall be locked at an angle of A=%fdegrees',A);