Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Why we are testing cables with dc?

1 3439

why ct output is in 5A?

3 4783

why we use copper earthing for neutral while for body GI.

Chennai Metro Rail Limited CMRL, Valeo Lighting Systems India Private Limited,

1 4971

why power factor is important?

Dalkia, MGC,

6 8203

can u describe the method used for protection of transmission line.

IBM,

1596

why impedance relay is used for medium transmission line protection

1773

why they were using TRIAC instead relay in some controllers and what is the advantages.

1491

we have earthmat at 110KV substation.we would like to take earth resistance.b some says that by connecting earth megger terminals (C1,P1) at middile point of earthmat (at riser) will cause voltage gradient at other earthmat nods and dont get exat earth resistance.when connecting at end nods will get exat value . is it correct .please explain

TNEB Tamil Nadu Electricity Board,

1690

I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?

US Electrofused Minerals,

1505

what is basic difference between the normal tube light choke and electionic choke ?

Amaron,

4 12193

what is ring main unit(Rmu)? what is its function

1 4212

what is the chemical name for oil that used in the transformer

NCC,

2 4431

How to set the star delta timer setting?

Integra,

1 3557

what is the differance between normal bybass & maintenance bybass in UPS?

1 3047

Generation of voltage for each phase are same of a turbogenerator.Although the short circuit current flow when two phase of turbogenerator are shorted(where current can't flow without potential difference),why?

1617


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Un-Answered Questions { Electrical Engineering }

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

1728


I have a CT meter with ratio 60/5. The meter reading of previous month was 3290.49 and that of current month was 3797.26. How many chargeable units as per normal meter should be my reading.

946


how many types are their in switchyard or substation(like D,I TYPE), what is differant between them

1631


How time response of the system is divided?

662


what is the need to express current and voltage in rms value? rms value is also called as effective value,what is effective value?

1458






Explain in brief description about the operation of DG sets.

1836


In parallel operation time both NGR’s close or not close if both close what will happen

3247


hey guys help me out.....what  are the industrial uses/functions of nozzles in industries 

1127


why the field winding in dc motor is not short circuited eventhough dc supply is applied across the winding

1377


why are distributed windings generally used in alternators?

2269


how we will deside the high voltage value

1430


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.

1599


what is upper impedance and lower impedance of a distance relay

1563


why there using acb enclosure in big buildings

1489


explain supply side and demand side energy management with advantages & disadvantages

1649