A 3-phase induction motor runs at almost 140 rpm at no load and 50 rpm – McqOptions

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1.	A 3-phase induction motor runs at almost 140 rpm at no load and 50 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?
A.	20 revolution per minute
B.	80 revolution per minute
C.	90 revolution per minute
D.	70 revolution per minute
Answer» D. 70 revolution per minute

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