A synchronous machine connected to a power system grid bus-bar is operating as a generator. To make the machine operate as a motor, the
A. direction of rotation is to be reversed.
B. phase-sequence is to be changed.
C. field excitation is to be decreased.
D. mechanical input is to be less than the losses at the shaft. [I.E.S. E.E.-II, 1993]
Answer:D
A synchronous machine connected to a power system grid bus-bar is operating as a generator. To make the machine operate as a motor, the
A. direction of rotation is to be reversed. B. phase-sequence is to be changed. C. field excitation is to be decreased. D. mechanical input is to be less than the losses at the shaft. [I.E.S. E.E.-II, 1993]