Electrical Engineering Interview Questions
Questions Answers Views Company eMail

why open circuit test is conducted on hv side and short circuit test is conducted on lv side of a transformer ?what is the reason for it ?

HCL, NTPC,

3 47334

why core is useful for a transformer ?and also in its operation ?

1572

why core is useful for the transformer and in its operation

1 2693

1.why should we connect the measuring instruments in l.v side in short circuit test of a transformer? 2.why the power factor is less in open circuit test of a transformer?

1589

why trip circuit supervision is taking through breaker contact? what happen if takendirectly?

GE,

2 3394

why voltage coil in wattmeter called as pressure coil why the pressure term is used in wattmeter?

NPCIL,

1 7742

Why we called L-G fault as line to ground fault why ground? suppose if a line falls on building roof then can we called these fault as line to roof fault? please explain why ground term is used here?

Bhel,

3 4887

If short circuit ratio is high is it bad or good for a machine then tell the reason...

Bhel,

1588

Is phenomenon of resonance is harmfull fr the machine? if not or if yes please explain it?

Bhel,

1443

If symmetrical fault occurs at the terminal of a synchronous motor then how the motor will act...explain it..

Bhel,

1594

Why we use modulus with voltage in stability equation that is P=[E][V]SIN@/X WHY VOLTAGE IS IN MODE VALUE WHAT IS THE REASON?

Bhel,

1 2563

EXPLAIN METOD OF IMAGE OF TRANSMISSION LINE/ WHAT ARE ITS PRACTICAL APPLICATION?

Coal India,

1413

WHAT IS DEGREE OF COMPOUNDING IN D.C MACHINE MEANS? HOW TO READ THE OPERATING CHART FOR ANY ELECTRICAL MACHINES?

Coal India, Ghana Grid Company,

4261

what do you mean by type zero control sytem ?Give an practical example of type zero contol sytem?

Bhel,

1541

Where we can use 3.5c cables instead of 4c cables.Why?

4 12212


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Un-Answered Questions { Electrical Engineering }

why occ characteristics of generator is also called as magnatization characteristics ?

1482


how to calculate micom relay earth falt time and current sertting

1818


what is the necessity of under ground cables ??

1618


What is installed in PAC that is control the humidity

1045


Why should be the frequency 50 hz 60hz only why not others like 45, 95 56 or anything , why should we maintain the frequency constant if so why it is only 50 hz 60hz?

692






Why induction motor is widely used in industry

2254


why star point of HT motor not earthed?

1740


what is meant by CT`s saturation ? Can we use Metering CT`s with Protetection CT`s ?

1656


advantage and disadvantage of team work?

1253


Why we specify TNC switch with 1NO 1NC ,2NO 2NC ? how we get connection.?

1256


The electrical energy required to raise the tempreture of a given amount water is 200 kwh. If the heat losses are 20%, the energy required is?

1509


what is the basic construction diffrance between servo motor ans sqiralcage induction motor

2006


WHICH SIZE A.B.CABLE IS USED FOR 11KV.

1747


what will happen if i connect 12 volt battery with 24 volt battery charger.

1455


i have install 750 kva distribution transformer at my site and want to do neutral earthing. what calculations should i follow to determine earthing conductor material and size?

1570