The regulation obtained by synchronous impedance method is always higher than actual value because
A. synchronous reactance is assumed variable while it is not.
B. effective armature resistance is assumed constant.
C. synchronous reactance is assumed constant while it is not.
D. field current is increased to give short-circuit current about twice of full-load current.
Answer:C
The regulation obtained by synchronous impedance method is always higher than actual value because
A. synchronous reactance is assumed variable while it is not. B. effective armature resistance is assumed constant. C. synchronous reactance is assumed constant while it is not. D. field current is increased to give short-circuit current about twice of full-load current.