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Electrical Engineering Interview Questions

Battery is a voltage source? give one example of current source and why?

521

Please help me regarding my one concern. - During earth pit testing we noticed that the Clean earth pit and dirty earth pit showing continuity (Resistance value - 5ohm) . I want to know that if both earth pit have separate location and there is not internal looping between PIT then why such continuity is showing on it . Because of this issue the field side all earthing point showing short. In PLC panel we are providing two types of earthing cable which is coming from separate earth pit (Clean and Dirty earth pit) because of earth PIT showing short our PLC is not complying spec . please help regarding this issues.

576

For DG or Transformer body earthing, is it necessary to terminate the earth bus to earth pit directly? If not terminated to earth pit directly in earth pit and connected to any common bus strip which ultimately connects to earth pit, what will be the pros and cons?

712

If only R Phase is connected in 2 pole elcb, n is not connected than it will work or not in ground fault.

505

Electrical 'C' license full abbreviation , and full form

579

kindly send me 11KV MV motor differential protection procedure by primary injection method.

487

What happen if transformer neutral path get removed ?

762

We have two APFC panels in same station. I need how to connect CT in two APFC panels.can we take one CT in series connection or two separate CTs.

473

please explain to me how to calculate current,voltage,resistance with formula??

495

for what voltage will reactive power be largest in 380 kv line : a) 375kv b)380kv c)385kv

513

What are the raitings of Mcb,mccb and Acb in detail ??

611

What is icu and ics in Acb and how many time icu or ics passes from breaker?

510

why we use Test Terminal Block in 11 KV and 33 KV electrical panels.

EMC,

517

before synchronizing an alternator,power factor is leading ,why?

CUMI,

500

we have amp, voltage, kw, length detail then how to calculte copper & alluminium size of conductor of 3-phase induction motor

490

Un-Answered Questions { Electrical Engineering }

PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT? EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT DIAGRAM?EMAIL-RAJ_SINGH_0376@SIFY.COM

1144

how synchronous condenser is used in place of synchronous generator with out negotiating IEEE standards? Can i use 3 generators as synchronous generators and 2 generators as a synchronous condensers in an IEEE 14 bus system with out disturbing the standards?

1185

Where should the lighting arrestor be placed in distribution lines?

173

how can i determine the gear ratio for a rack and pinion system if an electronic gate operated by an electric motor is to travel a distance of 5meters in 15 seconds.

1079

What is meant by bus bar protection?

150

How to test REF relay testing for LV panel as per Kahramaa standard?

2223

What do you mean by screen of power cables?

804

Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core

1561

what is interfacing in computer studies?

785

Is it possible to implement Restricted Earth Fault protection for a transformer without neutral CT?

2479

what is transistors comprised of?

186

What are the advantages of stationary armature and rotating field system?

194

How is the percentage impedence of a transformer fixed at design stage???

1087

What is meant by vector group

1464

What is meant by cold loop test in instrument

1630