Electrical Engineering Interview Questions
Questions Answers Views Company eMail

How one can say about a device (e.g: a light holder contains 20 or 30 L.E.Ds which glows when power supply is off, from which source they are getting the supply..... battery or capacitor) without removing and opening up its case ?


1 976

How one can check the charger of the mobile phone or any other charger .......... that is it working ? if , working is it delivering the required supply which is needed by the battery to charge properly ?

4 6534

although ckt breakers have taken the place of old fuse. But instead of it , these older ones are still used in the industries and homes ? why .... what are their advantages and disadvantages ? which one is leading and winning the race and competition ?


which type of A.C motor is used in the fan (ceiling fan, exhaust fan, padestal fan, bracket fan etc) which are find in the houses ?


25 54406

what are fluorescent lamps (fluorescent fixtures) & what are incandescen lamps (incandescents fixtures) ? differences between these two ?

1 912

how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?


1 2213

if we want to increase the back up time of an UPS what should we do ? if we want to decrease the charging time of a battery/batteries attached with the UPS what should we do ?

6 9624

what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?



whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?

16 13403

What is the difference b/w Earthing and Grounding?

4 4882

why dc current is supplied in america rather than ac

1 3189

can any one suggest websites having study maetrials for the electrical students?

1 811

why 3 phase is preferred than 1 phase?


4 11436

what is the order of mgnetiation current in a current transformer of 1000A/1A ratio?

Power Grid,

2 3191

generally on the roadside v hav 11kv line which is being step down to 440v line to line....so any1 can tell me which type of transformer they r using whether it is star to delta,delta to star etc...???

Core Solutions,

9 8928

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Un-Answered Questions { Electrical Engineering }

Why the symbol of register is "zig zag"


when elecromagnatic waves are propogated in a wave guide?


After synchronization with grid what is the demand value QKVAR and how we will maintain that?


why Lightning arrestor are made by 2 seperate stack of inslutor but why cvt are in single stack of insulator.


What is load boxes ?


Application Comparison between 22KV (UE)and 33KV (E) system. Are we allowed to use 33KV (E) cable in lieu of 22KV (UE) cable. What are the technical disadvantages.


how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.


how you will decide the distance between the power transformer and its fencing


sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....


What is power distribution criteria for converting single phase unbalanced residential load to 3 phase star connected balance system. Does total KW converted to 3 Phase. Means Divided by root 3.


which pump used in STP


why electron produce magnetic field when it is in motion?


how to minimize earth resistance upto 2Ω, if the resistance is 6 Ω ?


Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?


please describe the Transformer setting, Motor setting, I/C setting, Tie setting