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Electrical Engineering Interview Questions

IF avr is voltage regulator of genset means why we are giving genset CT sense to AVR ?

ABB,

4858

what is the use of CurrentTransformer in AVR ?

4105

what is the lemen of a single 5mm 13000mcd white led pls reply

3760

how much current does 3ph. 10 hp ac motor draw.

48023

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

1291

technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"

1391

What is the different types of cable & current capacity of cable

1289

what is formula of illumation calculation

1357

what happens when one of the phases out 0f 3 phases been removed under working condition and no load condition will the machine run if so plz send me why

3319

why the supply power frequency is 50hz in india? where as it is 60hz in US?

6703

How loading get increased in generator not the speed, while we increasing steam to turbine.

3287

what is purpose of manual bybass in ups

3830

how much current does 3ph a.c & d.c motor drawn.Plz. provide formula with example.

4967

Why the earth cable have current 1A - 2A , it is safety for Electrical system or earth cable should be zero amps ? how to troubleshoot?

1405

What do you mean by ACB and VCB?

L&T,

10184

Un-Answered Questions { Electrical Engineering }

LET ME NOW MORE ABOUT icu and ics for circuit breaker. how we calculate the rating of circuit breaker and i c u and ics values

2214

how to compare with Relay settings for HT< panels, RMU panel, and PSS CSS transformer?? 1) Load amps, 2)Tripping time, 3) CT ratio, 4)Cable size 5) Transformer KVA rating 6) transformer full load amps

282

835

WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.

1380

What would cause a 240v choke that should give 110v out on a 16w lamp to gradually increase to 160v?

1601

IN 1000kva transformer where the oil and winding temperature sensors is connected

1881

in our all power plant have connected in grid and grid voltage and plant voltage is same, but as per as electrical concept the power will transmit from high potential to low potential but here altough same,then how power transmit from power plant to grid.

1615

what is meant by LCR meter? where its useful ?

1407

Why lose 1 phase voltage in 33kv to 415v stepdown transformer

1100

why high speed tripping relay is used in protection circuit why not normal relay

694

A power transformer 4MVA/11KV/0.415Kv has been out of use in 12years. what maintenance actions/test need to be carried out before energizing.

759

what is a vector protection in transformer

1348

How to Decide(calculate) Bush bar size for copper and aluminiam ?

1517

If anyone would like to know or practice for FEWA papers contact me on mohamedrashad2@hotmail.com Just completed the supervisor exam in April 2021

561

We have 250 KW x 2 motors, which are load from 25% to 100% varying load in every minute , so how can we compansate the power factor. pl give your opinions on the above subject.

1179