The synchronous motor is not inherently self-starting because? Mark as favorite Copy Link The force required to accelerate the rotor to the synchronous speed in an instant is absent the starting device to accelerate the rotor to near synchronous speed is absent a rotating magnetic field does not have enough poles the rotating magnetic field is produced by only 60 Hz frequency currents Check Answer
The minimum armature current of the synchronous motor corresponds to operation at? Mark as favorite Copy Link zero power factor leading unity power factor 0.707 power factor lagging 0.707 power factor leading Check Answer
The back e.m.f of a synchronous motor depends on? Mark as favorite Copy Link speed load load angle all of the above Check Answer
When load on an over-excited or underexcited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is? Mark as favorite Copy Link more less equal twice Check Answer
Dust and dirt accumulation on motor winding will result in? Mark as favorite Copy Link rise in winding temperature increased core losses shorting of coils eddy current flow Check Answer
ln a synchronous motor which loss varies with load? Mark as favorite Copy Link Windage loss Bearing friction loss Copper loss Core loss Check Answer
ln a synchronous motor which loss varies with load? Mark as favorite Copy Link Windage loss Bearing friction loss Copper loss Core loss Check Answer
A synchronous motor will always stop when? Mark as favorite Copy Link supply voltage fluctuates load in motor varies excitation winding gets disconnected supply voltage frequency changes Check Answer
A synchronous motor will always stop when? Mark as favorite Copy Link supply voltage fluctuates load in motor varies excitation winding gets disconnected supply voltage frequency changes Check Answer
When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor? Mark as favorite Copy Link remains same as the original value decreases to half the original value tends to becomes zero increases to two times the original value Check Answer