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The speed of a three-phase induction motor is controlled by variable voltage variable frequency control

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The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque 

(1) Decreases (2) Increases (3) Remains constant (4) None of the above
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The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases 

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