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A four-pole Y-connected, 415 V, 50 Hz, induction motor has phase equivalent circuit parameters of R1=...

A four-pole Y-connected, 415 V, 50 Hz, induction motor has phase equivalent
circuit parameters of R1= 2 ohms. R2=2.2 ohms. X1=X2=4 ohms. X(motor)=90 ohms
Under rated condition, the rotor slip is 6%.
(i) What is the rotor speed and rotor electrical frequency under the
rated conditions;
(ii) Calculate the stator input current, power factor, and electromagnetic
torque under these conditions;
(iii) The machine is running at rated conditions and it is to be stopped
by switching the two stator leads. What is the slip and inducted
torque immediately after switching the stator leads?
(iv) One of the concerns for induction machines is their high starting
current. Explain the causes for this and the common methods to
reduce the starting current.

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