【判断题】Voltage regulators are circuits designed to maintain the output of power supplies at constant amplitude despite variations of the ACsource voltage or changes of the resistance of the load.
【单选题】Before taking insulation resistance readings of generator windings the automatic voltage regulators should be isolated and all semiconductor short circuited or disconnected in order to_______.
A.
. prevent charging of capacitive components within the automatic voltage regulator causing false regulation when generator restarts
B.
. prevent operation of automatic voltage regulator during insulation testing
C.
prevent damage to sensitive electronic components from high voltage tester
D.
protect insulation resistance tester from being damaged