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 _________
A. φm and 1.5φm, both rotating
B. φm and 1.5φm, both stand still
C. φm stand still and 1.5φm rotating
D. 1.5φm and 2φm, both rotating
Answer:A
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 _________
A. φm and 1.5φm, both rotating B. φm and 1.5φm, both stand still C. φm stand still and 1.5φm rotating D. 1.5φm and 2φm, both rotating
Explanation: In a 2 phase and 3 phase AC machine, rotating MMF is produced with magnitudes of φm and 3/2φm. Sanfoundry Global Education & Learning Series – Electrical Machines.