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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Why transformer neutral earthing? What is advantages?

 6 47164

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

 5 6775

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 2999

what is meant by brushed alternator & its working principle ?

 1535

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

 1877

What is the difference between relays and contactor construction wise?

 1599

which have higher efficiency transformer or induction moter

BARC,

8 17051

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

BARC,

6 5932

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 3982

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 6841

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

HAL,

8 10521

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

HAL,

2 4143

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

 6 11882

why corona ring is used in out door switchyard lightning arrestor

 3 13246

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 4397

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Un-Answered Questions { Electrical Engineering }

why we have and use 3 phase not 2 or 4 or other in power system?

1677

are there rmu for 3 transformer?

1413

what about GD square and its important for motor design?

3277

what is the breaking capacity and making capacity of circuit breaker and how

1579

Please clarify 1. Icw: rated short circuit working withstand capacity 2. Icu: Rated ultimate breaking capacity 3. Ics: Rated service short circut withstand capacity 4. other specification of ACB

2280




How to determine stage of Automatic Power factor controlling Relay(Apfcr)?

1686

What is Meter MF if External CT Ratio is 150/1 , PT Ratio is 132/110 Meter CT Ratio is 200/1 & Meter PT Ratio is 110/1

1324

What is the use of lag compensator?

660

Phase control and integral control are used for?

1768

If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?

923

What are dependent sources?

652

How 48-relay (incomplete sequence) functions?

3542

Why is the frequency not changed during transformation of electrical energy in a transformer?

830

Why corona leads to production of Ozone and glow of the color VOILET?

1493

What is the emf equation of a transformer?

658

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