Synchronous motor always runs at? Mark as favorite Copy Link the synchronous speed less than synchronous speed more than synchronous speed none of the above Check Answer
A synchronous motor can be made self starting by providing? Mark as favorite Copy Link damper winding on rotor poles damper winding on stator damper winding on stator as well as rotor poles one of the above Check Answer
Hunting in a synchronous motor cannot be due to? Mark as favorite Copy Link windage friction variable load variable frequency variable supply voltage Check Answer
The working of a synchronous motor is similar to? Mark as favorite Copy Link gear train arrangement transmission of mechanical power by shaft distribution transformer turbine Check Answer
The duration of sudden snort-circuit test on a synchronous motor is usually about? Mark as favorite Copy Link one hour one minute one second none of the above Check Answer
For V-curves for a synchronous motor the graph is drawn between? Mark as favorite Copy Link field current and armature current terminal voltage and load factor power factor and field current armature current and power factor Check Answer
The maximum power developed in a synchronous motor will depend on? Mark as favorite Copy Link the rotor excitation only the supply voltage only the rotor excitation and supply voltage both the rotor excitation, supply voltage and maximum value of coupling angle (90º) Check Answer
Under which of the following conditions hunting of synchronous motor is likely to occur? Mark as favorite Copy Link Periodic variation of load Over-excitation Over-loading for long periods Small and constant load Check Answer
The size of a synchronous motor decreases with the increase in? Mark as favorite Copy Link flux density horse power rating speed all of the above Check Answer
Synchronous motors are generally not self-starting because? Mark as favorite Copy Link the direction of rotation is not fixed the direction of instantaneous torque reverses after half cycle starter cannot be used on these machines starting winding is not provided on the machines Check Answer