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Electrical Engineering Interview Questions

What is the diameter of electromagnetic field around a 11000/415v transformer ? Dose it affect people who live 3-4 meter beside it?

1110

Why 50hz and 60hz frequencies are used by the world, why they are not taking 55hz?

5930

what will be the magnetizing current in the testing of 27 MVA transformer?

3156

when we start the tube light, then it takes initially 1100 volt, after glow it takes 120 volt?(when we give 220 volt a.c.)

3928

how many testing is necessary for 27 MVA transformer?

1139

why does the time taken for fuse to melt is longer as the wire length increases?

2309

PLEASE INFORM ABOUT THE IDEAL TEST RESULTS OF MAGNETIC BALANCE TEST OF TRANSFORMER 33/11 kv DELTA-STAR T/F

1314

what is meant by phase &line voltage, how its differ from each other ?

9444

what is synchronizing panel & its working.

6109

One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

2961

Is a DC Transformer Possible? if Yes, Then Why, if not Then Why?

12820

when meggering a 3ph,480v oil reservoir heater on a regen gas compressor, why do I get a reading to ground when meggering phase to ground? shouldn't it read opened or is there something that makes it read closed? on the same heater, when ohming, it reads open. thanx

3910

Please give me the formula stating relation between AC & Dc.

6606

how to stop oil leakage in power transformer.

4141

what is meant by vector group in transformers? wy we r using that?

3426

Un-Answered Questions { Electrical Engineering }

What is genrally the % Impedance of a Dg set? How can we calculate Earthing conductor size for a DG set?

2873

What are :- AC Distribution Board (Single & Double Front) DC Distribution Boards Distribution Board LT Breaker Panel.

1161

HOW TO DESIGN THE body EARTH cable(Copper Conductor) size for 60KVA UPS?

1055

can we use CBCT in neutral of solidly grounded transformer? in place of three phases we can pass only one phase which decreases the size of CBCT?

1250

is it value of power factor is more than unit. whats effects in the source supply

1040

why we permissive overreach in distance protection.where it is applicable to use in long r short lines

1818

what is conductor constant of raccun conductor

1133

Inductor and capacitor........power in one phase and ...... in it another phase.

1057

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593

how to calculate the power factor when instantaneous voltage and current has harmonics in it ?

965

1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve

1094

Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...

1184

How to findout raw or ups power? its not indicated in socket,

1072

please send me the L&T Emb. sys. placement papers and entire details of pattren

1373

what will happen reduce the transformer voltage from 415v to 406v, is it save the energy,? are this methodis good to reduce the energy.?

634