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Electrical Engineering Interview Questions

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

2785

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,……..,?

1302

How power factor of electric system improved?

5101

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

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.

1010

what is the equation of converting KW into HP ?

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...

26147

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

9520

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

HCC,

1048

What is the difference between an insulator and a dielectric?

5310

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

1090

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

9542

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

IBM,

23738

Is there any difference between circuit breakers and isolators

9082

What is IDMT? What is the principle

33282

Un-Answered Questions { Electrical Engineering }

What is industrial plc

803

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.

1141

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

1468

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

162

List advantges of active filter over passive filter?

163

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.

1197

166

937

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

1240

What is pd controller?

164

how to interlock 3 incomer-ACB,1 buscoupler ACB,... pls answer this question and if possible send me the ckt diagram..haifriends2910@gmail.com

1798

what is the difference between linear choke and suction choke?

1668

what is the difference between skin effect

1242

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

1150

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

545