Discussion
Adding resistance to the rotor circuit of a wound rotor induction motor
Answer: B
Correct answer: increases the starting torque without changing the maximum torque
The maximum torque depends on \( V \) and \( X_2 \) but not on \( R_2 \), so the height of the peak is fixed. What the added resistance does is raise \( s_{max} = R_2/X_2 \), sliding the peak towards standstill. If the resistance is chosen so that \( R_2 = X_2 \), the peak lands exactly at \( s = 1 \) and the machine starts with its maximum torque. This is the classic reason for using a wound rotor machine on a hard-starting load.
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