Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Fault current shall be part of tech specs of power cable or not?.

DAE,

1 1949

What is effect of over voltage and under voltage on ACB

EFS,

1392

Why is tan-delta test and capacitor measurement done on alternator?

TD Power Systems,

1676

Why MCCB is Getting tripped sometimes when there is no load in the Midnight ?

1381

why we store only dc in batteries ?

1 2143

why we dont store the ac power in battery?

TCS,

1 1955

How to synchronization will be done between two DGs ?

1300

what is pmu

Alstom,

1 2526

What is Tan Delta Test

Power Grid,

1 2026

What is the settings of distance protection relay in 400 kv line

Crompton Greaves,

1178

Whai isPCC and MCC Difference?

Pretech Plast,

1 1619

Why earthing is necessary for any equipment?

1163

How we can calculate the life of Lead acid battery

ABC,

1304

A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

1333

How much current in 100 kva Transformer HT & LT side

1 1606


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Un-Answered Questions { Electrical Engineering }

Why neutral cable carry current.

1512


# 4 hi friends i m from electrical branch and seeking for tech. + apti. both papers of hpcl plz get it available as soon as possible my email id is sumit_lig189@yahoo.co.in

1562


why +24 v and -48 v give to BTS? If -48v protect from surge then why we not use -24 v?

1410


Sir, My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50mm2. Now client asking us to reduce cable size by increasing runs. Sir, My question now when my mind strikes with 2 options 1) Divide load 74/2 = 36 and calculate cable for 36+36 making it 2 runs or 2) Simply i can divide 50mm2 /2 ie. 2 runs of 25mm2 Please suggest me sir

1420


1sq mm dc powr cable can carry how much dc currnt

1479






what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?

1810


What happened when capacitor connect series in ac circuit?

957


how to extend relay operating timing in 24V dc relay card (without using Timer )

1454


How to calculate Ith (I thermal) for curent transformer

1558


I am shobana from Chennai. I am having my personal interview on 19th Dec at Chennai.kindly mail me the questions to mail id shobana.shanthi@gmail.com

1862


HOW TO DESIGN THE body EARTH cable(Copper Conductor) size for 60KVA UPS?

1552


how to calculate the tarriff for an industry whose kva demand is 10 mva

1506


what is distribution board?

1855


Which motor is 3.3 or 11kV more reliable, in terms of efficeancy,maintenance, reliability.

1597


can we use CBCT in neutral of solidly grounded transformer? in place of three phases we can pass only one phase which decreases the size of CBCT?

1760