Practice over 1000+ GATE-level questions from this topic!
Designed to match the latest GATE pattern with topic-wise precision, difficulty tagging, and detailed solutions.
A 3-phase star connected slip ring induction motor has the following parameters referred to the stator:
The per phase stator to rotor effective turns ratio is 
. The rotor winding is also star connected. The magnetizing reactance and core loss of the motor can be neglected. To have maximum torque at starting, the value of the extra resistance in ohms (referred to the rotor side) to be connected in series with each phase of the rotor winding is ________ (rounded off to 2 decimal places).
Only rotor resistance 
load
For start, s=1
For maximum torque we must have maximum air gap power that is power across rotor resistance should be maximum.
By MPT,
Referring the external resistance to the rotor side,
