Explanation: All of the above applications require two independent sources of excitation. 2. Most of the electromagnetic energy conversion devices belong to __________
A. singly excited magnetic systems
B. doubly excited magnetic systems
C. multiply excited magnetic systems
D. both doubly excited magnetic systems and multiply excited magnetic systems
Answer:A
Explanation: All of the above applications require two independent sources of excitation. 2. Most of the electromagnetic energy conversion devices belong to __________
A. singly excited magnetic systems B. doubly excited magnetic systems C. multiply excited magnetic systems D. both doubly excited magnetic systems and multiply excited magnetic systems