Explanation: With one supply phase disconnected, a rotating MMF wave of varying amplitude is produced, but at a speed fluctuating around the synchronous speed. 8. In case of the 3 phase winding with delta or star connection without neutral, if one of the supply lines gets disconnected, then the MMF becomes __________
A. Stationary and pulsating
B. Rotating with synchronous speed
C. Rotating with sub synchronous speed
D. Rotating with super synchronous speed
Answer:A
Explanation: With one supply phase disconnected, a rotating MMF wave of varying amplitude is produced, but at a speed fluctuating around the synchronous speed. 8. In case of the 3 phase winding with delta or star connection without neutral, if one of the supply lines gets disconnected, then the MMF becomes __________
A. Stationary and pulsating B. Rotating with synchronous speed C. Rotating with sub synchronous speed D. Rotating with super synchronous speed
Explanation: Disconnection of one of the supply leads, results in single-phase operation of the machine. 9. If φm is the maximum value of flux due to any one phase, then resultant flux in 2 phase and 3 phase AC machines would respectively be given by _________