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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?

 3805

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

ABB, Navana,

2 17200

Earth leakage relay basic knowledge principle

Radiant,

1730

HOW to speed control of induction mototr using scalar control

 3 4903

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

 6 7271

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

HFCL,

2252

why transformer are rated in kva.

Dalkia, Nalco,

5 6778

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

BARC,

4 8642

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

BARC,

3946

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

 2 5448

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

 4 4316

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

 1558

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

 5 26342

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

 3 4081

which type of cabel

DMRC,

1910

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Un-Answered Questions { Electrical Engineering }

how many parameters can integrate with fire alarm basically ?

1489

What is the importance of earthing?

658

In HI POT test what is reason for applying the AC VOLTS and DC VOLTS in different applications what is the nessesity for this ?

1440

How to derive detailed design of Suitable bus Bar for 100A for 6.6KV?

1439

Explain the function and difference of Restricted earth fault, simple earth fault and sensitive earth fault with connection diagram.

2143




What do you mean by power transformer?

639

Comment on the working principle of operation of a single-phase transformer.

694

which book to refer in electrical engineering for iocl exam & which book for general english.

1756

how to synchronize 3 phase slip ring induction motors of different ratings.

1778

Why generation voltage in thermal power plant is between 11kv to 33kv?

609

what questions are asked in the interview for the post of an electrical maintenance engineer in FMCG companies?

2138

Dear sir, my knowledge about cable size determination is limited. Though I read examples I could not calculate the Cable size required for electric driven pump 40 KW, 380 Volt, 50 HZ, 50 meter from transformer and it is three phase star delta starting. Please help as there is no one in my surroundings to help.

1279

What are n circles?

664

what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?

1476

what is the control circuit for operating the clean room air shower

1723

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