Electrical Engineering Interview Questions

How to calculate the load loss and no load losses of the power Transformer? i am having the following details : full load ct : in AMP HV :1676 ; LV:31.5 1800 KVA ;33KV/620 V for wind mill applications

13414

working principle of UPS

86448

What is the technical reason for adopting color coding of three phase system as RYB.

ABB, ERDA,

26691

What is four quadrant metering system.

41753

What is harmonics. How does it get generated and means to arrest harmonics

17621

Difference B/W A/C & D/C Motors..?

17002

How does MCB operate without relay..?

26950

if we appling capacitor at above rated what are looses and what will be happen

5660

why do we need transformers?

39754

Why Humming noise originated in Starter motor and how it was generated ?

5943

i have attended the interview on 4th June,08 at Kolkata in IOCL, can anybody tell me what is its result

IOCL,

1590

why transformer does not obey ohm law?

46795

Why high voltage lines (overhead ) are called high tension lines?

31923

say a transformer is designed for 33/11kv step down with ratio 0.33 for load 1 mva. if am giving 11kv as a input that same transformer what will happen to its o/p voltage. and whether it can be operated for 500kva

4828

hr round

1725

Un-Answered Questions { Electrical Engineering }

As per standard, transformer body earthing and other Equipment earthing (Equipment earthing) did not connect. but in LT side termination we are doing metal glanding in both side Transformer to PCC Panel through armoured cable, now X'mer body earthing and PCC Pane earthing (Equipment earthing) both are connect.is this safe for X'mer or other equipment?

1247

what is frequency response?

696

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

1700

What is a differential amplifier? Also, explain cmrr.

748

what type of questions are asked and howmwny questions belong this catagory?

1747

sir please send me techinical questions for junior engineer posting in bangalore railway i am diploma holder

1603

Are Refrigerators & Deep Freezers the Inductive load ? How to calculate the Power Factor & hence the Output Power for them ?

4684

1754

What is core CT & it's function?

1682

how the synchronizing is obtained at bus couplers in grid substation? (because there we cannot change the frequency in one of transmission lines like in generator synchronization)

1891

State ohmâ€™s law?

694

Which motor is 3.3 or 11kV more reliable, in terms of efficeancy,maintenance, reliability.

1676

how can we select the type of wire.what factors we have to look on it , do we have some formula to calculate it. please guide me on it

1538

What is the function of electron gun assembly used in crt?

707

how to Select its CORE in electrical cables based on its applications? or Application of various types of electrical cable based on it CORE?

2815