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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is meant by 2 within a star in a voltmeter dial?

1060

what is the purpose of measuring % impedence?

1 2525

We operate a 10 Mw facility and we have been experiencing several trips due to fluctuations on the MVAR? We have checked all issues related to the AVR and we have found all OK? Can anyone help us? The grid voltage, internal voltage, all regular parameters look ok. MVAR fluctuate and there it goes the unit? What could be happening? Thanks!

5 3526

IF ANY MATERIAL AVAILABLE IN MARKET FOR MOTOR PROTECTION INSTEAD OF OLR & CONTACTOR ?

1 2798

HOW WE CAN REDUCE THE CIRCUIT COMPLEX OF STAR-DELTA STARTER .BECAUSE NOW WE USING ONE TIMER RELAY & THREE CONTACTOR FOR MAIN,STAR & DELTA ?IF ANY IDEAS PLZ POST.THANK U

1596

What is PEC??Applications........

Emerson,

1050

What is ERD used in Elevators??

Emerson,

1 1813

What is Diff btw Fire Alarm & VESDA System???

EFY, Emerson,

1407

What is high frequency grounding????Applications........

Emerson,

1 2168

What is FM200 Gas??Applications........

Emerson,

1375

What is d diff. btw Online & Offline UPS???

Emerson,

4 3916

What is d diff. btw MCB & MCCB???

Emerson,

1 4747

What is CCTV System???Applications........

Emerson, Honeywell, Joyalukkas,

16 41199

What is the Diff. btw Manule Pull Station & Manule Abort Station Switches used in FM200 System??

Emerson,

895

What is PQA???Applications........

Emerson,

1429


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Un-Answered Questions { Electrical Engineering }

HOW DO I CALCULATE THE SETTINGS FOR THE DIFFERENTIAL PROTECTION OF A 12kV/6.6kV, 6MVA,DYN11 XMER WITH PRIMARY SIDE CTR 400/1 AND SEC SIDE CTR 600/1?

1746


please send me jindal previous aptitude and technical question and answer.my email id is deep_raj@live.com

1054


What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.

1158


is there any current and voltage drop on liquid resistance starter water/soda tank ?

1042


What is the dependency of stiffness on load angle??

235






What is making & breaking current ???

505


what is the working process of over & under voltage relay.

1122


I have one ct of ratio 3000-2000/1 Amp its knee point voltage mentioned on name plate is 500-333/30mA-50mA at Vk/2. in secondary box there is three terminal named 1S1, 1S2, 1S3 then on which terminal obtained the knee point voltage ie 1S1-1S2 OR 1S1-1S3 & also specify the knee point voltage for the ratio 3000 from name plate.

1396


how could we know the size of cable by physical view?

757


I have a current transformer with 1 main reading meter with transformer outside the building and a control panel having 5 CT reading meters with black round coils inside the building. I want to know, A) when current pass through the Transformers, will the current be reduced or be the same and after that B) when current pass through the CT meters with black round coils, will the current be reduced or be the same. C) in the above process will the reading of the main meter be same or different, from the total reading of all the 5 CT meters.

928


Type of motor stater detail and working detail

851


two way ckt diagram can be drawn by how many ways? give diagram

964


Good day everyone,currently in our premise we using 30kw slip ring motor with resistance bank which we use as forward and reverse at conveyor bar handling. So,my question is how do we calculate the resistance bank which is suit the motor. Kindly,assist me... thank you

813


1)How much current can a 3-1/2 core 100 mm wire carry? 2)What are the special cables required for explosion proof wiring? 3)In case you do not have coal and salt for earthing, how can you achieve good temporary earthing? 4)One horse power single phase motor is more likely to get hot than a one horse power 3 phase motor. Is it true or false, if true why? 5)What are the different types of soft starters for large motors?please explain?

3711


HOW TO REDUCE POWER PLANT AUXILIARY POWER CONSUMPTION?

2507