(v) For satisfactory performance of a 3-phase 420 V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to .... .. V. I (vi) The stator of a ... from 20 Hz source. The rotor of this motor would run at speeds of...... r.p.m. and r.p.m. (vii) The direction of rotation of a single-phase repulsion motor can be reversed by .
|Title||:||A Text Book of Electrical Machines|
|Publisher||:||Firewall Media - 2006-04-01|