We have seen previously that when load changes, for constant excitation, current drawn by the motor increases. But if excitation…
Q. Why the transformer ratings are in kva? A. Since the power factor of transformer is dependent on load we…
Effect of Slip on Rotor Parameters In case of a transformer, frequency of the induced e.m.f. in the secondary is…
Consider a phasor diagram with normal excitation i.e. such a current through field winding which will produce flux that will…
Q1: Where do we require single-phase induction motors? Ans: Single-phase induction motors are required where (i) 3 phase supply is…
The magnetic field required for the operation of a d.c. generator is produced by an electromagnet. This electromagnet carries a…
The characteristics is separately excited d.c. generator are divided into two types, 1) Magnetization and 2) Load characteristics. 1.1 Magnetization…
The Blondel diagram of a synchronous motor is an extension of a simple phasor diagram of a synchronous motor. For…
It is shown that in slip ring induction motor, externally resistance can be added in the rotor. Let us see…
The various effects armature reaction can be summarised as 1) The armature reaction always results in reduction of generated e.m.f.…