1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?

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1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?

2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m.

( This question is about electrical machines, and I need to answer in 30 minutes please ) 

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