Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is Faraday's law

317

What is the role of the 50 STUB protection at a GIS 400KV substation with SIEMENS protection relays?

Power Plant,

336

In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

356




What is trip and closing coil in cb? Why need of them

271

what is the mechanical safety of DG ?

399

Please, if 1kw is equal to 1.25kva; how then do I know how many kva in 7.5kw?

288

We are planning to synchronized DG's with our captive plant in the event of black start of plant, but before sync we checked voltage of DG with our plant voltage and it varies from 5 V to 450 V. So in this condition how we can sync DG with plant ?

251

Two electric lamps 40 W, 220 V each are connected in series across 220 V. What is the power consumed by the connection?

289




what is the IPC ? & what the uses ?

Bhel,

253

Why 9KV surge arrester having 7.65KV of MCOV?

308

How do we calculate over and under frequency tolerance from generator data?

DPS,

244

CT Ratio of a energy meter connection is Red Phase : 100/5A, yello Phase : 50/5A & Blue phase : 100/5 A what is the overall Multiplication factor

325

I use 20 nos led tube 4feet, in pathway 100mtr approximate, so what size cable i use for lighting

Oman Cables Industry SAOG,

319

Why the earth to phase voltage is high 250 compare to other two phases

284

What is the difference between security constraint unit commitment and security constraint optimal power flow?

College School Exams Tests,

370


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Un-Answered Questions { Electrical Engineering }

what are the condition that makes hooter blow?

1091


In both 600/1000 V cable and 450/750 V cable, we can supply 415 V. However for distribution, all utilities are using only 600/100 V instead of 450/750 V. What is the reason?

545


why connecting surge unit in contactor coil

693


Why electrical power generation and transmission done in 3 phase system not more than 3 phase ?

1873


In siemens PLC, why do we want to move the data ?

1117






how to find the multiplication factor for digital energy meter and analog energy meter

1045


how can found motors folt current ? how can disided circuit breakers caoicity and breaking capicity ?

803


WHAT IS MEANT BY TV TERMINAL IN 500MVA TRANSFORMER?

911


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?

626


TO CALCULATE THE RESISTANCE OF GRR OF HT MOTOR 400KW WHEREAS STATOR VOLTAGE 6.6KV AND ROTOR VOLTAGE 705V AND ROTOR CURRENT IS 346A.

3981


why swinburnes test cannot be performed on series machines?explain

1096


Can a generator rated 400 V, 60 Hz be used in a 50 Hz System? Yes or No ? Why ?

483


What is the formula for calculating the Instantaneous Short Circuit & overcurrent for any breaker

839


When will you multiply and devide with derating factors to the actual value while sizing the cable?

774


What is grid collapse? what is the reason for it?

782