Question: A three-phase motor is used to drive a pump. It is observed (by the use of a stroboscope) that the motor speed decreases from 898r/min

A three-phase motor is used to drive a pump. It is observed (by the use of a stroboscope) that the motor speed decreases from 898r/min when the pump is unloaded to 830 r/min as the pump is loaded.

a. Is this a synchronous or an induction motor?

b. Estimate the frequency of the applied armature voltage in hertz.

c. How many poles does this motor have?

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