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 4743

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

GEB,

1 1842

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?

1025

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

1170

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,

976

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

XYZ,

1 2035

Why PS class CT is always preferred for Differential protection?

1074

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

1604

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

1 1614

how to calculate IR value of 33KV cable ??

1320

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

1 1732

list the advantages of RCCB over other circuit breakers?

1257

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

1 1288

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

UltraTech,

1023

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

UltraTech,

1201


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Un-Answered Questions { Electrical Engineering }

dc supply given to dc generator winding.how is possible? my knowledge is saying the winding will burn. please reply.

961


how we decide the require size is this for a known current at fuu load?

1419


Which types of gate insttaled in static switch. Please give me answer.

1163


What is the diffrence (Technical & Construction ) between CBCT & Normal CT?

1537


why Lightening Arrester Probe sharp at Top of telecom tower.

1082






i've iocl interview.. if you know the interview process please give me information..

1440


Disadventage of cable-gland earthing if any ?

1647


How we can change the direction of rotation of Induction motor? Prove it using graphical

1609


y we use neutral,all r told its used to for closed path..k its a just used to closed path,in a transmission line y we put same conductor used n both phase and neutral..if we use less than phase conductor in neutral mean we ll reduce cost its right r wrong..if we use mean any problem occur in transmission line..

1519


how does grading rings & spacers in transmission line works? Working Principle?

1588


if you are in a software company,then why do you want to come in a core company like sail, ntpc(where lots of trouble like tension but you have a good life in a it company) ?

1432


Define coil span?

620


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

1586


how we can find of current direction(supply comming/out going direction) when a transmission line passing through sides.

1890


do we use links in a dc circuit?if so what s its use in it?

1486