Practical Commutation
The e.m.f. induced in each coil of armature is alternating in nature. If load is connected, the current flowing will also be…
Symbolic Representation Of D.C. Generator
The armature is denoted by a circle with two brushes. Mechanically it is connected to another device called prime mover. The two…
Why Implement The Smart Grid Now?
Since about 2005, there has been increasing interest inthe Smart Grid. The recognition that ICT offers significantopportunities to modernise the operation of…
Introduction To Armature Reaction
For the operation of any d.c. machine, presence of magnetic flux is essential. Whenever current flows through a field coil, it produces…
Construction Of Three Phase Induction Motor
Basically the induction motor consists of two main parts, namely The part i.e. three phase windings,which is stationary called stator. The part…
Split Phase Induction Motor
This type of motor has single phase stator winding called main winding. In addition to this, stator carries one more winding called…
Characteristics Of D.C. Generators
The d.c. generators have following characteristics in general, 1) Magnetization characteristics 2) Load characteristics 1.1 Magnetization Characteristics This characteristics is the graph…
Interview Question On Relay
1. State the characteristic features of synchronous motor. Ans: a. the motor is not inherently self starting b. The speed of operation…
Methods Of Excitation
The magnetic field required for the operation of a d.c. generator is produced by an electromagnet. This electromagnet carries a field winding…
Expression For Back E.M.F Or Induced E.M.F. Per Phase In S.M.
Case i) Under excitation, Ebph < Vph . Zs = Ra + j Xs = | Zs | ?? ? ? = tan-1(Xs/Ra) ERph ^ Iaph = ?, Ia lags always by angle…