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
The induced e.m.f. in a synchronous motor working on leading power factor will be? Mark as favorite Copy Link more than the supply voltage less than the supply voltage equal to the supply voltage none Check Answer
A synchronous motor can be used as a synchronous capacitor when it is? Mark as favorite Copy Link under-loaded over-loaded under-excited Over-excited Check Answer
A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased? Mark as favorite Copy Link power factor as well as armature current will decrease power factor as well as armature current will increase power factor will increase but armature current will decrease power factor will decrease and armature current will increase Check Answer
In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on? Mark as favorite Copy Link d.c. excitation only speed of the motor load on the motor both the speed and rotor flux Check Answer
Mostly, synchronous motors are of? Mark as favorite Copy Link alternator type machines induction type machines salient pole type machines smooth cylindrical type machines Check Answer
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