Operation Of Synchronous Motor At Constant Load Variable Excitation
We have seen previously that when load changes, for constant excitation, current drawn by the motor increases. But if excitation i.e. field…
Transformer Interview Questions Part 2
Q. Why the transformer ratings are in kva? A. Since the power factor of transformer is dependent on load we only define…
Effect Of Slip On Rotor Parameters : Part 1
Effect of Slip on Rotor Parameters In case of a transformer, frequency of the induced e.m.f. in the secondary is same as…
Analysis Of Phasor Diagram Of Synchronous Motor
Consider a phasor diagram with normal excitation i.e. such a current through field winding which will produce flux that will adjust magnitude…
Single Phase Induction Motor Interview Questions
Q1: Where do we require single-phase induction motors? Ans: Single-phase induction motors are required where (i) 3 phase supply is not available…
Types Of D.C. Generator
The magnetic field required for the operation of a d.c. generator is produced by an electromagnet. This electromagnet carries a field winding…
Characteristics Of Separately Excited D.C. Generators
The characteristics is separately excited d.c. generator are divided into two types, 1) Magnetization and 2) Load characteristics. 1.1 Magnetization or Open…
Blondel Diagram ( Constant Power Circle) In Synchronous Motor
The Blondel diagram of a synchronous motor is an extension of a simple phasor diagram of a synchronous motor. For a synchronous…
Effect Of Change In Rotor Resistance On Torque
It is shown that in slip ring induction motor, externally resistance can be added in the rotor. Let us see the effect…
Effects Of Armature Reaction
The various effects armature reaction can be summarised as 1) The armature reaction always results in reduction of generated e.m.f. due to…