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Electrical Engineering Interview Questions

testing of Vector Group – YNaoD II

1892

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?

1176

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

3864

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

L&T,

9076

What is Skin effect of the cable?

L&T,

9761

What is hysteresis losses?

GMR,

6211

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

GMR,

1348

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

3352

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

5306

How can you test the vector group of power transformers?

4681

3909

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

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?

4632

WHy neutral to ground trips when neutral touches the ground

2880

WHAT IS THE SHOPE TESTING

TATA,

3321

Un-Answered Questions { Electrical Engineering }

why induction motors are rated at 0.8 power factor.

1099

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

1083

why power factor is important?

6420

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

1028

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.

1166

On what cycle does thermal power plant operate?

199

What are electric motors?

196

Write a note on materials used as a fuse element.

1277

Advantage of LT panel vs HT panel

1453

What are the internal and external faults?

177

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

1056

Explain about technical and non technical losses in distribution system?

215

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

1108

what is mean by dry frequency

1491

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

194