Explanation: The speed at which rotating magnetic field revolves is called the synchronous speed and this effect is equivalent to mechanical rotation of permanent magnets or DC excited field poles. 8. The magnitude of rotating flux _____________ at all instants of time.
A. Changes
B. Remains constant
C. Pulsates
D. Any of the mentioned
Answer:A
Explanation: The speed at which rotating magnetic field revolves is called the synchronous speed and this effect is equivalent to mechanical rotation of permanent magnets or DC excited field poles. 8. The magnitude of rotating flux _____________ at all instants of time.
A. Changes B. Remains constant C. Pulsates D. Any of the mentioned
Explanation: FR = 3/(2Fm) (for a 3 phase machine). A constant amplitude rotating MMF or rotating field is produced in the air gap of a three phase machine. 9. The amplitude of rotating MMF wave is proportional to