Electrical Engineering Interview Questions
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What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

CEB,

961

Can i replace Earth leakage relay to the faulty Earth Faulty Relay

1032

How to Calculate KA Rating of Main LT Panel

1156

Control wiring of a dol starter for forward and backward

Basj Industries,

1020

why transformer tank is in rectangular shape what happen when it is in step shape

934

The efficiency of a 100kva transformer is 0.98 at full load as well as half load , for this transformer what is the Copper loss at full load ?

1789

How to calculate Temp from Resister from PT100 equation,

1191

explain which quantities change in the starting and the and the running condition in induction motor

Gulf Spic,

938

what is a composite error in current transformers, why occurs & in which it will occur i.e, either metering ct/ protection ct

1281

Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??

1107

Why the power factor improvement is so important in industrial loads

1389

How can we convert 11 kv to 440 volt without using transformer ?

Electrical,

971

can we use engine degreaser for electrical motors?

1282

Why auxiliary transformers are not connected in parallel in primary stations?

Adweb,

944

What will happen if i used 11KV earth ht kit to 11 KV / 11 KV cable termination?

975


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Un-Answered Questions { Electrical Engineering }

im working in one private compeny in gujarat. i was complet diploma electric in 2010 from gujarat technical board. now i want electric supervisor licence in gujarat but i dont't know when i apply? plz give me address of the licence dippartment office in gujarat. gandhinagar

1399


how to calculate voltage drop and followed by cable calculation?is there avail in formula?

1580


Dear sir, How to calculate 3.5 core pvc aluminium armoured cable meter wise carrying amps rating.Please give the solution with a good example.

1289


How to Calculate Current Rating of SDFU (Switch Disconnector Fuse unit) for Protectionof Capacitor Bank connected to Busbar of 800Amp,in LV side of 11/0.433KV, 250KVA Transformer?

4866


The series field winding has low resistance while the shunt field winding has high resistance. Why?

1213






What is meant by Low Resistance Cable and High Resistance Cable.

1415


What are the different towers used in 132kv transmission line? what are the differences between the P,R,S towers used in 132KV and detailed explanation

1424


Explain the functioning of diode?

642


WE HAVE THE DC RECTIFIER 1500A, INPUT VOLTAGE IS 3 PHASE. HOW TO CALICULATE THE LOAD? 3 PHASE SIDE EITHER dC SIDE. PLEASE SUGGEST ME

1394


what are the necessary basic electrical topics to learn for mechanical engineer to deal practical problems.

1755


IN SINGLE PH TRANSFORMER IF LEKAGE IMPEDANCE DROP IS NEGLECTED ,THE FLUX IN THE MAGNETIC CORE and the lekage flux linking a winding are a)proportional to the applied v to the winding i respectively.

1623


why in an industry; machine having rated 200 h.p stopped after power factor is maintained above 0.97 lag by control panel in view-of energy saving

1579


How does a transformer contribute towards the widespread popularity of ac system over dc?

633


I completed iti in2004 I was worked in A grade contractor can I get c licence

1245


How can we calculate the KVA rating of a Distribution transformer from its core details?

1584