Discussion
For that machine, the rotor current frequency is
Answer: A
Correct answer: 2 Hz
The rotor frequency is the slip times the supply frequency:
\[ f_r = s f = 0.04 \times 50 = 2 \text{ Hz} \]The low value is typical of normal running and is why the rotor reactance \( sX_2 \) is small compared with \( R_2 \) at full load. It rises to the full 50 Hz only at standstill, where \( s = 1 \).
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