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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is the need of black rock stones under the transformer yard?

TNEB Tamil Nadu Electricity Board,

5 7692

What is the name of transformer oil?

18 10122

lightning arrester rating selection procedure: (line to line voltage(kV)/(squ.root of 3))*squ.root of 2. now the question is, IS this above formula correct for both STAR and DELTA connected system???

1 3294

I have a 25 KVar capacitor bank at my facility.How to check the capacitor bank ??

2 11443

When we use a multimeter, while checking continuity of a closed circuit , what is happening inside multimeter, how it is working to produce a beep wheather it is closed or open.. is there any internaly voltage/current source inside multimeter?

TNEB Tamil Nadu Electricity Board,

3 5559

please send me last 5 year interview questions

ONGC,

1208

why are maintine power factor 0.99 in Eb line? why are used capacitor bank in Eb line? what is the purpose capacitor bank?

TNEB Tamil Nadu Electricity Board,

4 9431

who & how the notations given as RYB to 3phase power supply.

1 2880

clarify types of motor operated valves and advantages

1112

what is phase shifting transformer.

2 3546

How to find the voltage drop for short,medium,long transmission lines of a 33kv sub-station?

1 4307

can anyone help me regarding bout Electrical designs and calculations .. which text book should i follow as i am a trainee engineer.Description of my work which is Electrical designs like cable sizing, lighting, lightning, Gensets sizing, motor sizing, transformer sizing, generator sizing, circuit breakers, PDB MCC PCC SLDB MLDB panels, Single line diagrams mainly, substation desings, cable routing and layouts, reactive power compensations, power factor improvement, voltage drop calculations, power generations, power transmission, power distributions all calculations.Please help me

3 4334

what is electrical machines

1 2322

I would like to install the largest KW alternator to a 200 amp aluminum bus box in my home. Is it possible to install a 250 KW 400v 251amp synchronous alternator to my home?

2 2245

how to measure genset CT coil range?

1 2970


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Un-Answered Questions { Electrical Engineering }

Actuality I have at home electrical panel with 220v 50hz, and I want to converter from there to 110v 60hz, to wiring on the half of my house. Also I like to keep another half of my house with the original 220v 50hz. What is the best and safety way to do?

924


what is magnetizing and demagnetizing current in generator and motor?

2265


How to convert 2 phase to 3 phase electricpower in induction moter?

1182


is it possible to say motor horsepower number without seeing name plate(when name plate damaged)

3188


What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

579






at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

1103


what is RFCT and Insulgard Relay & It's function?

1213


Which type of motor is used in trains, what is the rating of supply used explain working principal?

244


Name two low frequency oscillators?

356


cc of scorpio?

1338


If ROC does not lies inside unit circle,then ? a) Fourier transform converges b) Z transform converges c) Hatly transform converges d) Colpit Transform converges.

1171


In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

2237


battery capacity use of made?

1602


Which type of air compressor is used now a days in the market. Keeping in mind of energy efficiency and maintenance points. Relevant documents may also be sent on mentioned email ids.

896


What is the basis for selecting Vk/2 or Vk/4 for REF and Differential protection of Transformer and What is the significance of magnetising current

1417