A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

• A.  0.78 Ω.
• B.   0.24 Ω.
• C.  0.66 Ω.
• D.  0.45 Ω.

Answer: (B)