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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

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

NTPC,

5 7097

At what distance power transformer can be placed from generating ?

NTPC,

6 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?

5 4422

why neutral is neccessary?

7 8992

what is the difference between neutral

10 7917

how and where megger works?

Power Grid,

9 30110

how induction generator works?

3 4151

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

Noida Power,

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?

Data Entry Operator, RRB, SSC,

2 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.

Electrical Tech,

1 6343

why a vaccum is created in condenser

Honda,

13 58763

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

MacLellan, Yash Technologies,

14 47479

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

2 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.

5 14503

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

4 5345


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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