A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _ – McqOptions

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1.	A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20.
A.	418.56
B.	420.12
C.	421.23
D.	422.45
Answer» C. 421.23

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