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Electrical Engineering Interview Questions
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WE know that for Inductor X=2pifL,In DC f=0,then X=0 so,V=IX=0;But In the DC excitation of rotor of AC generator,DC motor field coil which coils are inductor so why does not applying DC voltage short the rotor coil of AC generator and field coil of motor?If it would then DC source might be damaged but it is not happened. Why does the strand conductor of Electrical power transmission line make twist?

3234

What is the basic difference among IPS,UPS,EPS?

ABB, Navana,

2 14982

Earth leakage relay basic knowledge principle

Radiant,

1292

HOW to speed control of induction mototr using scalar control

3 3781

if one of the phase is failed to 3 phase IM. what will happen?

6 5643

how we calculate electrical load on a building according to area?

HFCL,

1805

why transformer are rated in kva.

Dalkia, Nalco,

5 5209

What are the necessary conditions for production of rotating magnetic field.

BARC,

4 7094

what is the purpose of shading ring or shading coil in electrical equipments.

BARC,

3391

what is differnce between oil transformer & dry type transformer ???????????

2 4633

Generally the incandescent lamps in bathrooms fuse due to high voltage at night.What is the simple solution of this problem?

4 3286

What should be the protection scheme for a 15kw, 3-phase motor working in a lathe machine.

1120

Why voltmeter is not connected in seris & ammeter connected in parallel ?

5 24786

why we use post insulators in no ofstacks at substation for supporting equipment ? why we not use single post insulator

3 3201

which type of cabel

DMRC,

1402


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Un-Answered Questions { Electrical Engineering }

how to calculation increase power factor for single phase

1361


working principle of AC Servo Motor with its construction

7855


for a 500 KVA connected load, I calculated 30% of capactor for power correction. Even after using 225 KVR capactor PF is not improving. What could be reason for low Phase correction factor?

1117


How do we calculate the Out put voltage of generator, after the excitation is being given?

1101


how to get bearing & winding temperature of an induction motor?

1030






what are factors to be consider in electrical installation like load factor,diversity factor .....

943


Dear sir, iam completed iti ncvt electrician 2000-2002 & diploma electrical eng completed 2008-2010 distance education in rvd university, still i got B licences only but my working company want C licences, how to i get c licencese pls reply me iam in critical situation thank you karthick 9841637803

859


WHAT IS SHORT CIRCUIT STRENGTH OF 100 AMPS MCCB?

1230


why the starting voltage drop in a cable needs to be limited?what is percentage of the voltage drop allowed during starting?

981


How does a battary stores charge in it? please explain in simple manner and in detail.thanks

1139


What is the Difference between Ac Drives and Dc Drives? According to application, speed, Torque, cost, Reliability, Construction, Motor etc... Thankyou !!!

1238


Please provided formula for calculate the cable size from step up transformer to M.V panel, run overhead aluminum cables, total load is 5mega watt, total length 900 feet.

906


how are reversing the direction of rotation of dc motor

808


how we select ac fuse rating of an power inverter???

989


how can see the ac indoor or out door ac which Tr

1137