Introduction To Coupled Circuits
The two circuits are said to be coupled circuits if all or part of the electrical energy supplied to one circuit is…
Applications Of Three Phase Synchronous Motor
The important characteristics of the synchronous motor is its constant speed irrespective of the load conditions, and variable power factor operation. As…
Transformer Interview Question Part 3
Q. What is the significance of vector grouping in Power Transformers? A. Every power transformer has a vector group listed by its…
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…
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…
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…
Methods Of Starting Synchronous Motor
As seen earlier, synchronous motor is not self starting. It is necessary to rotate the rotor at a speed very near to…
Losses In Induction Motor
The various power losses in an induction motor can be classified as, i) Constant losses ii) Variable losses i) Constant losses : …
Losses In A Transformer
Two types of losses occur in a transformer: Core loss or iron loss occurs in a transformer because it is subjected to…