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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Corona occurs between two transmission wires when they (a) are closely-spaced (b) are widely-spaced (c) have high potential difference (d) carry d.c. power

Power Grid,

2 4315

which type of winding is used for high voltage & low current?

GEB,

1 1550

Can any one give an explanation about rating factors of cable? if we are laying the cable on the air with an temp 15 degree then rating factors will be 1.15 and if we are laying the cable on the air an temp 60 degree then rating factor will be 0.76 please describe it and what is the difference between rating factor and derating factor?

890

Difference between rating factor of cable and derating factor of cable?

990

what size steel armoured cable is required to support 1500kva capacity. would 70mm squared be enough or would I need 90 or 120mm squared 3c plus earth

Conan Minerals,

814

single phase voltage 230 and Three phase voltage 450 why 690 voltage

XYZ,

1 1770

Why PS class CT is always preferred for Differential protection?

907

Who are the manufactures those manufacturing 3Cx2.5sqmm FRLS cables. I heard about FRLS technology adopted only in wires useful for wirings

1438

For 160kw motor what size of cable and material is needed.?

1 1328

how to calculate IR value of 33KV cable ??

1141

How many battery required for an 3kva online ups with 3 hrs back up with usage of 3 fans,3tube lights

1 1417

list the advantages of RCCB over other circuit breakers?

1107

what will happen if dc is supplied in acb or mccb or other circuit breakers?

1 1070

sir, 3phase induction motor takes different pf and different KW in three phase while running,explain reason

UltraTech,

858

3ph motor running with unequal kw and different pf what are the reasons

UltraTech,

1045


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Un-Answered Questions { Electrical Engineering }

In siemens PLC, why do we want to move the data ?

1673


where can the transformer having vector group Yny0 be used??

3313


how we calculate the short circuit capacity of the busbar in LV & HT?

479


What is zero of the system?

482


WHAT IS THE WORKING PRINCIPLE OF A GENERATER.how is a GTG (Gas TURBANE Generater) working.plz explane

1884






What facility we get after CT secondary earthing and how?

1563


WHaT IS THE CONCEPT OF INDUCTION LAMPS IN MODERN LIGHTINGS, and HOW IT WORKS TO EMIT LIGHT ( AS NO ELECTRODES ARE PRESENT ) ?" COULD INDUCTION LAMPS CAUSE INTERFERENCE WITH COMUNICATIONS INTO A STORE USING INDUCTION LIGHTING ? WHAT IS THE BENEFIT OF USING THE LOW FREQENCY INDUCTION LAMP , VERSUS LED , AND VERSUS FLUORESCENT, AND VERSUS ANOTHER KIND OF LIGHTING . THANK yOU MOISES GUINDI

1485


what purpose to use excaiter in DG.?

1990


what is the difference between changer, converter and transformer?

743


How to set the relay,,??

1456


What is the maximum percentage voltage drop (vd%)for a motor control center

1360


how can i find cable size from current rating?

1144


bsec exam syllabus (mis)

539


How does HT work & Voltage required?

1555


Is Transol transformer oil comparable to nynas nytro libra?

2427