A pony motor is basically a? Mark as favorite Copy Link small induction motor D.C. series motor D.C. shunt motor double winding AC./D.C. motor Check Answer
A synchronous motor can be started by? Mark as favorite Copy Link pony motor D.C. compound motor providing damper winding any of the above Check Answer
The power developed by a synchronous motor will be maximum when the load angle is? Mark as favorite Copy Link zero 45º 90° 120º Check Answer
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
Which of the following methods is used to start a synchronous motor? Mark as favorite Copy Link Damper winding Star-delta starter Damper winding in conjunction with star-delta starter Resistance starter in the armature circuit Check Answer
Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor? Mark as favorite Copy Link Phase to phase winding resistance Stator winding to earthed frame Rotor winding to earthed shaft All of the above Check Answer