Introduction To Electrical Machine
An electrical machine is a device that convert the electrical energy into mechanical energy and vice versa. Transformer is also listed in…
Interview Question On Circuit Breaker And Relay
Q. Explain different types of faults? A. Shunt Faults: Basically shunt faults are short circuits. When the path of the load current is cut…
Interview Question On Relay
Q. Mention some of the applications of Directional Over-Current relays? A. 1. Double end fed power system 2. Single end fed system…
Electrical Engineering Interview Questions And Answers Part 17
WHY STAR DELTA STARTER IS PREFERRED WITH INDUCTION MOTOR? Star delta starter is preferred with induction motor due to following reasons: •…
Electrical Interview Questions Part 8
Q:What is the difference between Isolator and Circuit Breaker? A:Isolator is a off load device which is used for isolating the downstream…
Methods Of Improving Commutation
There are two practical ways by which commutation may be improved. These methods are, 1. Resistance commutation and 2. E.M.F. commutation. 1.1…
Interview Question Of Dc Motor Part 2
Q1.What is the principle of the DC Motor ? A. If the current carrying conductor is placed in the maganetic field, mechanical…
Factors Affecting The Speed Of A D.C. Motor
According to the speed equation of a d.c. motor we can write, The factors Z, P, A are constants for a d.c.…
Rheostatic Control
Speed Control of D.C. Series Motor (Part2) 2. Rheostatic Control In this method, a variable resistance (Rx) is inserted in series with…
Speed Control Of D.C. Series Motor : Flux Control
Speed Control of D.C. Series Motor (Part1) The flux produced by the winding depends on the m.m.f. i.e. magnetomotive force which is…