A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have

A. 30° B. 60° C. 90° D. 180°

A. remains same as the original value B. decreases to half the original value C. tends to becomes zero D. increases to two times the original value

A. increases as the load increases B. decreases as the load decreases C. always remains constant D. none of the above

A. Universal motor B. Synchronous motor C. Induction motor D. Reluctance motor