Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

5- What is the task (function) of the excitation and isolation transformers in power plant? 6- What is the task (function) of LCI (A), LCI (B) and LCI (COS) in power plant? : LCI (A) and LCI(B) are load commutating inverter for generator turbine starting. , LCI (COS) is load commutating inverter change over switch

3764

7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

2229

How power factor of electric system improved?

Nalco,

6 9215

How to calculate cable sizes in sq.mm. with using motor KW? Any formula there?

Aswani Properties, BRB Cable, Construction, Hitachi, L&T, Microcool Systems, Nahar, NWPF, Reliance, Renault, Saha Bright Polytech, SGH, TATA, Techno Electric and Engineering, TFIL, Thermax,

18 306240

I need the recommended size for a 3 phase transformer at 13.8 KV Primary and connected loads of 3000 kVA at 4200 volts and 2375 kVA @ 480 volts AC.

Duke Energy,

1974

what is the equation of converting KW into HP ?

4 9646

what happen if i connect DYn11 and DYn1 vector group transformer in parrallel?other things are same like votage ration,x/r ratiob etc...

4 32530

is there any difference between protection C.T and measuring C.T?if yes then what is the difference?

BARC, Century Rayon,

4 12372

why we r not earthed Control cable of C.T. terminals

HCC,

1989

What is the difference between an insulator and a dielectric?

2 7385

What are the different power system losses and how can it be eliminated?

2010

Explain the power rating of a bulb, say 60W, what if the voltage changes

4 13376

Why is the earth pin in a 3-pin plug the longest and the thickest?

IBM,

10 29690

Is there any difference between circuit breakers and isolators

7 13037

What is IDMT? What is the principle

3 36860

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Un-Answered Questions { Electrical Engineering }

71ohm,111ohm,95ohm,179ohm in calculate the total ohm in series circuit

1632

63MVA,220KV/6.9KV Transformer LV side neutral is connected to Earth pit through NGR. Whether this earth pit required to connect with near by below grouding earth mat or it is to be kept separate?

2688

What is a advantage of Self Reset Lockout ? On Fault breaker get trip & fault no longer exist then self reset lockout how inform us?

1832

What is kirchoff ’s current law (kcl)?

1041

sir iam a 3rd yr eee student.no core company comes for recruitment to our college.my aim is to be placed in l and t.tell me the procedures.

1977

What is referred to the electron in the outer orbit?

1107

explain transformer ct connection?

2020

how to produsing geretor power

2157

Define peak time.

1094

is the value of inductance depends upon the evalue of thitha in doubly excited machine?

1832

why impedance relay is used for medium transmission line protection

2270

how harmonics generated in induction furnance? how minimise it?

1965

In radial network the source is fed from 1 end both ends at central

2076

diff.between servo motor and ac motor

2006

how to calculate the surge level of surge suppressors related to the SF6 cicuit breakers?

1938

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