Two dc series motors are mechanically coupled. One is operating as a generator and the other as a motor. Which of the following statements are correct ?
A. The friction losses of the two machines will be the same when both are running at the same speed.
B. The iron losses of the two machines will be identical when their excitations are identical.
C. The mechanical losses of the two machines will be identical for identical speeds and excitation of the two machines.
D. All of the above.
Answer:D
Two dc series motors are mechanically coupled. One is operating as a generator and the other as a motor. Which of the following statements are correct ?
A. The friction losses of the two machines will be the same when both are running at the same speed. B. The iron losses of the two machines will be identical when their excitations are identical. C. The mechanical losses of the two machines will be identical for identical speeds and excitation of the two machines. D. All of the above.