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Electrical Engineering Interview Questions
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How to select the gauge of wire for winding of motors? How to select number of turns for winding of three phase induction motor?

npcc,

1748

Practical condition in 400KV Sub station:- Breaker(open) , isolator(open), Earthing (close) at both end e.g A & B. Now Open A Stn Earthing than Open B stn Earthing (Which have a 50MVA reactor) , AND suddenly show R,Y,B phase 704KV,573KV,118KV respectively. Que is without closing of breaker how it is possible.???? My Whats app No:07621840498 for Further Discussion. Pls experts suggest.

 1113

why do we provide metallic enclosure to bus duct and then ground it?

 1 3266

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

Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?

 1934

If any cable burnt how can we identify it burnt by high current of high voltage? 

 1501

Why we use Delta connection in the secondary side of a High Voltage transformer?

 1 2288

What is the function of NER and NET?

Asian Paints, GHH RAND,

1533

what are upstream faults and downstream faults in power system

Sreetech,

2 7823

What is the difference between surge arrestor and surge capacitor?

Shreem Electric Ltd,

2 4757

why we used dc supply for field in dg set

Hindusthan National Glass,

1359

in catridge heeter  watts =110, 260 v ,  i checked in multimeeter meeter shows 50 ohms but oms law r=v square /w  260*260=67600, and 67600/110=614.5 ohms  how to caluclate exact ohms in heetre s 

 2 2128

What will happen when we will connect lamp in between phase and earth. 

 3 3070

function of apfc pannel

 3 3187

Where is the best place to mount  distribution panel in a house.

Wantro Technical Services,

1159

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Un-Answered Questions { Electrical Engineering }

what is DRP panels?

1112

Explain the different regions in frequency response?

156

what is different between phase and netural

1024

when we decide to use soft starter drive or vfd drive in mcc to operate apump?

1126

During Starter Panel Com missing I Found The Main Incomer 40Amp MCB 10KA Trip When Motor Change Star To Delta Motor Rating 20HP BUT When We Use Same MCB To Other Motor It Does Not trip Or What Is Necessaries for Star Delta Starter MCB SFU MPCB OR MCCB And What are The Breaking Capacity of MCCB in the Motor above 15HP

996




How to select cable the size, what is the parameters use and what is the formulas use for this cable size calculation?

963

If Polarization index of motor 8.75 at 500volts of medium voltage 4.16 KV motor what this mean winding good or bad pl answer if any reffrence book give me the link

1272

what is conductor constant of raccun conductor

1132

What is the problem of internal failure in ship engine telegraph system norcontrol?

1190

What are the types of instrument transformer?

163

WHAT IS SUBSTATION & ACCORDING TO VOLTAGE HT,EHT SUBSTATION EXPLAIN IT

2140

what is the setting of locked rotor in HT motor ? (answer expecting in percentage)

1340

how are reversing the direction of rotation of dc motor

777

is there any device that works properly accept relay, it may be fuse but if i want fuse of 33kv 300 amp it is avaliable, pls give me details

1046

Which motor is 3.3 or 11kV more reliable, in terms of efficeancy,maintenance, reliability.

1027

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