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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Why we are testing cables with dc?

1 3525

why ct output is in 5A?

 3 4947

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

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

1 5129

why power factor is important?

Dalkia, MGC,

6 8513

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

IBM,

1658

why impedance relay is used for medium transmission line protection

 1856

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

 1551

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,

1764

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,

1568

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

Amaron,

4 12423

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

 1 4313

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

NCC,

2 4561

How to set the star delta timer setting?

Integra,

1 3671

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

 1 3161

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?

 1681

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Un-Answered Questions { Electrical Engineering }

Importance of fault current in power transformers and how to monitor the same? How is it different from winding temperature?

1376

features of hbc fuses

1973

formula for calculation of switchgears(i.e. contactor, fuse, cb, relay etc.), if load current is given?

1695

hi friend i am going too attend for hpcl in this month please help me by sending written test question papers i am in the stream of E.E.E

1569

how we decide wire gauge for ac or dc coil and what is the basic diff. B/w these two coil?

1714




how to define tell me about self

1555

how i can calculate the size for fire cable

1529

why 5kW motor becomes unbalance if its relay trip 1st time and its set value is 7.0 A

1561

what is the principle of operation of CFL ??

2242

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............

1407

what is self capacitance of inductor

1939

If short circuit ratio is high is it bad or good for a machine then tell the reason...

1635

how we calculate the withstansing current capacity of wires&cables?

1528

What is the high series capacitance winding on high voltage power transformer ?

1643

what parameters should we check to reduce the power bill

1868

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