Some Useful Electrical Equations.

Useful Electrical Equations: · For Sinusoidal Current: Form Factor = RMS Value/Average Value = 1.11 · For Sinusoidal Current: Peak Factor = Max Value/RMS Value = 1.414 · Average Value of Sinusoidal Current (Iav) = 0.637 x Im (Im = Max.Value) · RMS Value of Sinusoidal Current (Irms) = 0.707 x Im (Im = Max.Value) · A.C Current = D.C Current/0.636. · Phase Difference between Phase = 360/ No of Phase (1 Phase=230/1=360°, 2 Phase=360/2=180°) · Short Circuit Level of Cable in KA (Isc) = (0.094 x Cable Dia in Sq.mm) /√ Short Circuit Time (Sec) ·...

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Some common Interview questions (general side).

If you will take the time necessary to write out brief answers to each of the questions bellow the mentioned list, it will help you to clarify your own thinking and establish ready answers. 1.How would you describe yourself? Introduce yourself?2. What are your hobbies?3.How did you choose this company?4.What are your long-range career goals?5.What experience have you had in this type of work?6.Which accomplishments have given you the most satisfaction?7.Why did you decide to go to this particular discipline/field/subject /profession?8.How...

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Interview Questions For Electrical Engineering

Given the highly intelligent and competitive nature of electrical engineering, expect a tough interview process. Although many of the questions will test your technical skills, it is also important to be prepared to respond to inquiries about other aspects of your character that will impact your probability of success as an employee. Interview Questions For Electrical Engineering The following list presents non-technical interview questions...

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What is the Role of Capacitor in AC and DC Circuit?

Role of Capacitor in AC Circuits:  In an AC circuit, capacitor reverses its charges as the current alternates and produces a lagging voltage (in other words, capacitor provides leading current in AC circuits and networks)  Role and Performance of Capacitor in DC Circuit:  In a DC Circuit, the capacitor once charged with the applied voltage acts as an open switch. Rule of Capacitor in AC and DC Circuit What is the Role...

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What is the Difference Between Neutral, Ground and Earth?

The Main difference between Neutral, Ground and Earth? ‪ To understand the difference between Neutral, Ground and Earth, we must understand the need of these things first. Neutral Neutral is return path for an AC circuit which is supposed to carry current in normal condition. This current may be because of many reasons, primarily because of phase current imbalance and some time because 3rd and 5th harmonics also. There may be others reasons...

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What is the difference between a battery and a capacitor?

While batteries and capacitors have similarities, there are several key differences. Like - Electrical energy in a Capacitor is stored in an electric field, where a Battery stores its electrical energy in a chemical form.  When a battery is discharging it, can be slower than a capacitor's ability to discharge because there is a latency associated with the chemical reaction to transfer the chemical energy into electrical energy....

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Why Power Plant Capacity Rated in MW and not in MVA?

For the following reasons, a Power plant capacity rating may be expressed in MW instead of MVA: In a Generating station, the prime mover (Turbine) generates only and only Active Power. That’s why we rated a power plant capacity in MW instead of MVA. It's mean no matter how large your generator is, but it depends on the capacity of the  engine (Prime mover/Turbine) I.e. a 50MW turbine connected to a 90MVA alternator in a power plant...

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Why Motor rated in kW instead of kVA?

Why Motor rated in kW/Horsepower instead of kVA? We know that Transformer rating may be expressed in kVA as well as Generator andAlternator rated in kVA Designer doesn’t know the actual consumer power factor while manufacturing transformers and generators i.e. the P.F (Power factor) of Transformer and Generator/Alternator depends on the nature of connected load such as resistive load, capacitive load, and inductive load as Motors, etc. But...

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Why AC rated in Tons, Not in kW or KVA? A Guide about Air-conditioning system and Refrigeration.

Why AC rated in Tons, Not in KW? AC (Air-conditions and Refrigeration are always rated in Tons. Air conditioners are always rated in Tons capacity instead of kW because Air conditioners are designed on the basis of quantity of heat removal from room, hall or specific area. Quantity of heat is termed in Tons means if an air conditioner is able to remove 1000 kilocalories of heat or 4120 kilojoules or 12000 BTU of heat in an hour...

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