Synchronous Motors The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading unity or zero zero or 0.8 leading unity or 0.8 lagging unity or 0.8 leading unity or zero zero or 0.8 leading unity or 0.8 lagging ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In case one phase of a three-phase synchronous motor is short-circuited the motor will run at 2/3 of synchronous speed run with excessive vibrations not start take less than the rated load run at 2/3 of synchronous speed run with excessive vibrations not start take less than the rated load ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors An important advantage of a synchronous motor over wound round induction motor is that its power factor may be varied at will its speed may be controlled more easily None of these its speed is independent of supply frequency its power factor may be varied at will its speed may be controlled more easily None of these its speed is independent of supply frequency ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Synchronous motor always run at More than synchronous speed Less than synchronous speed None of the listed here The synchronous speed More than synchronous speed Less than synchronous speed None of the listed here The synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then the excitation is said to be hundred per cent the motor is said to be fully loaded the excitation is said to be zero per cent the torque generated is maximum the excitation is said to be hundred per cent the motor is said to be fully loaded the excitation is said to be zero per cent the torque generated is maximum ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Hunting in a synchronous motor can not be due to Windage friction Variable frequency Variable supply frequency Variable load Windage friction Variable frequency Variable supply frequency Variable load ANSWER DOWNLOAD EXAMIANS APP
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