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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

5- What is the task (function) of the excitation and isolation transformers in power plant? 6- What is the task (function) of LCI (A), LCI (B) and LCI (COS) in power plant? : LCI (A) and LCI(B) are load commutating inverter for generator turbine starting. , LCI (COS) is load commutating inverter change over switch


7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?


How power factor of electric system improved?


6 5101

How to calculate cable sizes in with using motor KW? Any formula there?

Aswani Properties, BRB Cable, Construction, Hitachi, L&T, Microcool Systems, Nahar, NWPF, Reliance, Renault, Saha Bright Polytech, SGH, TATA, Techno Electric and Engineering, TFIL, Thermax,

18 290357

I need the recommended size for a 3 phase transformer at 13.8 KV Primary and connected loads of 3000 kVA at 4200 volts and 2375 kVA @ 480 volts AC.

Duke Energy,


what is the equation of converting KW into HP ?

4 6574

what happen if i connect DYn11 and DYn1 vector group transformer in parrallel?other things are same like votage ration,x/r ratiob etc...

3 26147

is there any difference between protection C.T and measuring C.T?if yes then what is the difference?

BARC, Century Rayon,

4 9520

why we r not earthed Control cable of C.T. terminals



What is the difference between an insulator and a dielectric?

2 5310

What are the different power system losses and how can it be eliminated?


Explain the power rating of a bulb, say 60W, what if the voltage changes

4 9542

Why is the earth pin in a 3-pin plug the longest and the thickest?


10 23738

Is there any difference between circuit breakers and isolators

7 9082

What is IDMT? What is the principle

3 33282

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Un-Answered Questions { Electrical Engineering }

What is industrial plc


We have 90mX100m hangar with 16 no.of supporting pillar. It is required to provide power supply on all pillars. what is suggested earthing scheme for hangars.


why we need to us lenz's law for synchornous motor


What is the maximum operating temperature for a thermoplastic insulated cable?


List advantges of active filter over passive filter?


how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.


Please elaborate th´evenin’s theorem?


what is your majour contributions in your present job


How to check 11000/1.732 to 110/1.732 Potentila transformer (PT)?


What is pd controller?


how to interlock 3 incomer-ACB,1 buscoupler ACB,... pls answer this question and if possible send me the ckt


what is the difference between linear choke and suction choke?


what is the difference between skin effect


why it is so called as xlpe(cross linked poly ethyline) cable?


How many wall/floor flange will i use in bus duct system if we have in our design a 35th floor building.