Synchronous Motors When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is more less equal twice more less equal twice ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the magnitude of stator back emf depends on _____ Load on the motor Both the speed and rotor flux Speed of the rotor Dc excitation only Load on the motor Both the speed and rotor flux Speed of the rotor Dc excitation only ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______ Mid way between N and S poles of stator 45° (electrical) behind stator poles Coincident with statorbpoles None of the listed here Mid way between N and S poles of stator 45° (electrical) behind stator poles Coincident with statorbpoles None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor runs at speed ranging from ______ 3600 to 6000 rpm 150 to 1800 rpm 1800 to 3600 rpm None of the listed here 3600 to 6000 rpm 150 to 1800 rpm 1800 to 3600 rpm None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors An important advantage of a synchronous motor over wound round induction motor is that its speed is independent of supply frequency its power factor may be varied at will None of these its speed may be controlled more easily its speed is independent of supply frequency its power factor may be varied at will None of these its speed may be controlled more easily ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Most of the synchronous motors are _______ power factor metors. Unity 0.5 leading 0.8 leading 0.8 lagging Unity 0.5 leading 0.8 leading 0.8 lagging ANSWER DOWNLOAD EXAMIANS APP
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