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Electrical Engineering Interview Questions

1.what to do if ferquency of any power system continue to decrease ?

NTPC,

7097

At what distance power transformer can be placed from generating ?

NTPC,

6960

What would be the ratio of a Delta-Wye tranformer having 48000 volts phase to phase on the primary and 4160 volts phase to phase on the secondary?

4422

why neutral is neccessary?

8992

what is the difference between neutral

7917

how and where megger works?

30110

how induction generator works?

4151

Where I can get the sample question for post of Junior engineer electrical-II For RRB Bhubaneswar.

1156

I have applied the post Junior Engineer-iii(c&w)in R.R.B chennaI recently . can i get any model question paper LAST 4 YEARS?

6826

Why different types of connection in transformers are used? (star/star,star/delta,delta/star,delta/delta)Why we are only taking in consideration of star/delta type transformers? if only star/delta is good in practice where doses other type of transformers are used? Note: i want to know place of using different types of transformers other than Star/delta type with brief description.

6343

why a vaccum is created in condenser

58763

how to check the 3ph capacitor is good or not.

47479

how can we represne the analog signal and digital signal if want to measure the speed and we have to use PLC

3260

how would you come to know if a transformer is double wound or auto? note that there is no tag. you are given only a multimeter.

14503

How i can identify the 220V and 110V power supply equipment? No tag number.

5345

Un-Answered Questions { Electrical Engineering }

My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

1026

if i am in front of transmission line how to know that current direction without any equipment

799

define hysteresis loss, eddy current loss and windage loss

1021

how much allowable resistance that can be difference in motor all coils?

1348

why voltage form factor of PT are increase , when it is ecpected heigher spikes in system. how it is calculated.

1059

how to calculate kvar in Akiva

975

when ID fan will immediately stop through VFD what exactly cause and problem the ID fan

494

Explain the different regions in frequency response?

156

Explain (in simple ) - root mean square. whats its role in electrical fundamandal.where its used

1312

how does grading rings & spacers in transmission line works? Working Principle?

1124

i have some screw comprressor with 630kw power,i have established them with simple star to delta circuit,by the way there is so much inertia when the screw comprressors start, can you offer me contactors power with 400vac or any cataluge to choose the contactors

909

As a electrical engineer.. what are the basic norms should follow in transformer oil testing.. 1.What is the Electrode type? 2.How long time you will give for oil testing?

2616

why we have and use 3 phase not 2 or 4 or other in power system?

1219

How can we calculate cable size in Low voltage & high voltage

673

What is NGR . What is the purpose of 10 sec ,60 sec rating of NGR.

814