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EEE Interview Questions IV

1. What is Power System? It is a branch of electrical engineering which deals with the study of generation, transmission, distribution and utilization of electrical energy 2. What is Power Factor? The cosine of angle between voltage and the current in an AC circuit is known as power factor 3. How should be power factor for the good working system? Power Factor should be less than 1 for the good working system 4. What is one line diagram? One line diagram is a single line representation of  three phase power system It consists of symbol representation of  bus bar, Generator, Alternator, e.t.c [caption id="attachment_91" align="alignnone" width="624"]                                                                one line diagram 5. W...
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Synchronous Condensor

Synchronous Condensor: In electrical engineering, it is considered as a borderline between a motor and generator with no mechanical load  In other words, it is a DC excited synchronous motor whose shaft is connected to nothing It can compensate either lagging or leading power factor by supplying or absorbing reactive power from the line It is also called as synchronous Condensor or synchronous compensator Working: Kinetic energy stored in motor of machine will help to stable a power system during rapid fluctuations of load  It involves three conditions based on power factor: Under Excitation   Unity or Ideal  Over Excitation  Under excitation: In under excited condition, the machine will operate at lagging power factor  It draws lagging current from the supply line  Lagging power factor can be corrected by supplying reactive power   Reactive power drawn from capacitor bank decreases when grid Voltage decrea...
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Synchronous motor - Detailed Description I

Synchronous motor vs Induction motor: In AC motor there are two types: Synchronous motor Asynchronous motor or Induction motor Lets see the main difference between synchronous and Asynchronous motor: 1. In construction wise : Synchronous motor has stator wounded on winding for specific number of poles and a salient pole rotor which is energized by DC supplysimilar to that of synchronous motor but the rotor may be short circuited squirrel cage or changing slip ring 2. In Speed wise : As we know Synchronous motor always runs at Synchronous speed where as Induction motor runs at speed less than\n synchronous speed Synchronous speed: N =Ns Induction motor speed: N<Ns   3. In working principle wise : Synchronous motor principle is magnetic locking , where as Induction motor principle is Relative Magnetic Field (RMF) as it is based on Lenz law 4. In power factor wise : Synchronous motor has the ability to operate in leading, lagging and unity where as Induct...
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