Electrical Machines A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is 1, 2, 3 and 4 3 only 1, 3 1, 2 and 3 1, 2, 3 and 4 3 only 1, 3 1, 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The primary and secondary windings of a transformer are inductively linked. conductively linked. electrically linked. mechanically linked. inductively linked. conductively linked. electrically linked. mechanically linked. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In normal dc machines operating at full-load conditions, the most powerful electromagnet is interpole and compensating windings together armature winding interpole winding field winding interpole and compensating windings together armature winding interpole winding field winding ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to two. unity. zero. infinity. two. unity. zero. infinity. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Field weakening control method is used for the _________ ? both A and B below rated speed None of these above rated speed both A and B below rated speed None of these above rated speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The material used for commutator brushes is mostly mica. cast iron. copper. carbon. mica. cast iron. copper. carbon. ANSWER DOWNLOAD EXAMIANS APP
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