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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Why transformer neutral earthing? What is advantages?

6 45240

What happens if ac is applied to dc systems and vice versa?

5 5276

last week we did the REF relay test by closing single pole (R phase) of CB and apply 380V at the primary of delta transformer. we get 33A at the primary of the R phase star end. but we get 380A at both R an B in delta side. how and why?

Siemens,

1 2386

what is meant by brushed alternator & its working principle ?

1124

Whar is the KvA rating of 33Kv substation & actual kv rating of power generaating station.

1446

What is the difference between relays and contactor construction wise?

1170

which have higher efficiency transformer or induction moter

BARC,

8 14407

Ammeter of 1 ohm resistance measure max 10 ohm to measure higher resistance from it

BARC,

6 4259

When i went to a interview the interviewer ask me a question for that i cant able to answer him if anyone knows answer me How will you design a capacitor bank for a plant? if my p.f is 0.6 i have to improve it to 0.9 or 1 what kind of steps i have to do? and is there any formula for calculating this?

2 3189

When i went to a interview the interviewer ask me a question for that i cant able to answer him if anyone knows answer me How will you design a capacitor bank for a plant? if my p.f is 0.6 i have to improve it to 0.9 or 1 what kind of steps i have to do? and is there any formula for calculating this?

APNPDCL,

6 5201

Why the generating station rating is in KW though the rating of generators in KVA?

HAL,

8 8566

What are the solutions for avioding sulfide formation at bimetalic (Copper &Aluminium)overhead joints?

HAL,

2 3100

In three pin socket normally three pin in between three pins earthing point is more thickness why?

6 10181

why corona ring is used in out door switchyard lightning arrestor

3 11922

the distance from my office to d.g is aprox 400mtrs and voltage drops ibn my office near about 40 volt what should i do p[ls suggest.

4 3286


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Un-Answered Questions { Electrical Engineering }

in basic 2 phase will short means tripping the power but spot welding 2 phase shorting but not tripping it will welded why.....(Q)

1070


The gauge indicates the number of amps, but what about voltage? How voltage rating (for wire or fuse) determined?

1008


why it is so called as xlpe(cross linked poly ethyline) cable?

1187


How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?

1062


Why derating factor os applied on Cables?

1088






why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?

1174


What is a signal flow graph?

204


Two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why?

189


Its possible to use 3core 2R of 240 sq.mm cable for 3phases & separely 50sq.mm 3core cable fully for Neutral for connection of PCC to MCC 3ph..4wire system?

1184


Who are the manufacturer for Nitrogen based Fire Protectio/explosion prevention for Oil Filled Transformers? India and international both?

980


If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these

1028


what may the reason for vector shift in a generator?

970


If we have to feed a housing complex having load 8MVA, than what would be the better option, either we first step down 33kv supply into 11kv & than 430v or we proposed no of 33/.44 kv transformer, also which option is economical?

1265


What does bode plots shows?

212


what about the power of wattmeter at starting and loding?

1235