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1. |
The low voltage winding of a 400 / 230V, 1 phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be _______ V . |
A. | 75 V |
B. | 315 V |
C. | 115 V |
D. | 65 V |
Answer» D. 65 V | |