Is it possible to include/ Exclude external resistance in the rotor of a Squirrel cage induction motor?. Justify Last Answer : No it is not possible to include/ Exclude external resistance in the rotor of a Squirrel cage induction motor because, the rotors bars are permanently short circuited by means of circuiting rings (end rings) at both the ends. i.e. no slip rings to do so....
What are the effects of increasing rotor resistance in the rotor circuit of a 3-phase induction motor as starting? Last Answer : Due to addition of resistance in rotor circuit by the stator not only reduces the staring current, in addition to that the starting torque developed than those given by DOL starting....
What is the Necessity of starter? Last Answer : Both d.c motors as well as three phase induction motors are self starting but these motors show the tendency to draw very high current at the time of starting. Such a current is very high and ... such a high stating current. Such a device which limits the high starting current is called a starter. ...
What is the function of no-voltage release coil in d.c. motor starter? Last Answer : As long as the supply voltage is on healthy condition the current through the NVR coil produce enough magnetic force of attraction and retain the starter handle in ON position against spring force. When ... force to retain so handle will come back to OFF position due to spring force automatically. ...
What are the methods to reduce the magnitude of rotor current (rotor induced current) at starting? Last Answer : By increasing the resistance in the rotor circuit by reducing the magnitude of rotating magnetic field i.e. by reducing the applied voltage to the stator windings ...
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