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
Explanation: Widely used motor/generators such as synchronous and induction machines belong to doubly excited systems, and many other practical applications require multiply excited magnetic systems. 3. In a doubly excited magnetic system with salient pole type stator and rotor, if the rotor is not allowed to move, then the equation for magnetic field stored energy in establishing the currents from zero to is and ir is __________