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Two series motors are mechanically coupled. One machine is running as a motor and the other as a generator. The iron and friction losses of the machines will be identical when | |
A. | their speeds are identical. [Wrong Answer] |
B. | their speeds and excitations are identical. [Correct Answer] |
C. | their speeds are equal but back emfs are half the supply voltages. [Wrong Answer] |
D. | their ratings and armature sizes are identical. [Wrong Answer] |