20 A three-phase motor supplied from a three-phase source is used to drive a pump. The rotor speed is 898 rpm when the pump is unloaded and decreases to 830 rpm when the pump is loaded. a) What is the...

Extracted text: 20 A three-phase motor supplied from a three-phase source is used to drive a pump. The rotor speed is 898 rpm when the pump is unloaded and decreases to 830 rpm when the pump is loaded. a) What is the frequency of the supply voltage in Hz ? b) How many poles does the motor have ? c) What is the slip in percent at full load? d) What is the corresponding frequency of the rotor currents? * Εισαγάγετε την απάντησή σας