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Electrical Engineering Interview Questions
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testing of Vector Group – YNaoD II


When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?


Dear Sirs, I am a technical persons.In one of our Electrical Sub- Station, We have installed three numbers of 1250KVA ,11KV/0.415KV Transformer to feed the Factory load. We have found some abnormality. In one of our Transformers the leakeage current from transformer body to earth through earth continuity wire is almost 86 Amp but in other transformer it is (5-10)Amp. where the load current on three phase and neutral are respectively 1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical person help me about the reasons of this situation and how I can rectify the fault. Moreover,I have measured the earth resistance of the Earth continuity wire which is less than 1 Ohm. Thanks Tapas Barua

3 3864

What are the testing to be done before the installation of 1000 KVA Transformer?


3 9076

What is Skin effect of the cable?


8 9761

What is hysteresis losses?


2 6211

What is third harmonic?what is the effect of it?



I've heard that most of the substations are rated in multiples of 1.11 because of form factor.What is form factor?

3 3352

How much pole motor can be desion for 415 volt ,50 hz.Power supply. in pratical condition . Prakash veer singh

5 5306

How can you test the vector group of power transformers?

2 4681

hi friends iam collecting details about motor,generator & transformer so send some web links to about motor,generator & transformer ,please help me .i need your help.thank u

4 3909

Can someone tell me how to calculate the size of a power cable? What are the factors involved in cable sizing?

5 5111

Could anyone clarify my wondering. What is the difference between knee point voltage and saturation voltage of the CT. Is their any formula to calculate these values?

2 4632

WHy neutral to ground trips when neutral touches the ground

1 2880



2 3321

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Un-Answered Questions { Electrical Engineering }

why induction motors are rated at 0.8 power factor.


Why can't we take NO LOAD TRIAL of motors having V1 mounting??


why power factor is important?


please give me solution to rectify the emi(electromagnetic interference)


how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.


On what cycle does thermal power plant operate?


What are electric motors?


Write a note on materials used as a fuse element.


Advantage of LT panel vs HT panel


What are the internal and external faults?


Explain the different methods used in the choice of rotor slots for reduction of harmonic torques in an induction motor.


Explain about technical and non technical losses in distribution system?


How to design the no. of ceiling fans required in 5mtr X 10 mtr X 3 Mtr hight room?


what is mean by dry frequency


What is the effect of positive feedback on the stability of the systems?