Electrical Engineering Interview Questions
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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

Premier,

1417

How to apply 'c' license and also explain what is difference between 'c' and 'b'license.i am also working in one of the private company.i have finished my diploma in 2014 .i have already finished in ITI electrician course.....

1535

what is conductor constant of raccun conductor

CSPDCL-Chhattisgarh State Power Distribution Company Limited,

1744

Please tell me in DETAIL about the following 3 types of fuses or recommend me a good power system protection book or a website link ? 1.Dropout Fuse 2.Striker Fuse 3.Empulsive fuse (not sure if its impulsive or explosion fuse , sorry)

1654

What is the difference Marshaling box and RTCC (Relay tap changer circuit) Panel of transformer ?

1 5033

what will be the efficiency off x'mer during no load test and during short circuit test

GPSC Gujarat Public Service Commission,

1 3336

How dc generators direction can be reversed ??

GPSC Gujarat Public Service Commission,

2 4852

What are the safety equipments you should use while you are in a hvac switch yard

GPSC Gujarat Public Service Commission,

1 3926

Do you know what is dry-out test in x'mer

First American Corporation, GPSC Gujarat Public Service Commission, Jindal,

2194

What is meant by vector group

GPSC Gujarat Public Service Commission, VA Tech Wabag,

1940

What are IR values and what it should be for coil and for insulator

GPSC Gujarat Public Service Commission,

2493

working function importance of mdc meter

1675

what is inter connected dc generator?

Lovely Professional University,

2198

Is there is any difference between AC and DC Cables

1 5942

How can get elongation of 2 k.G aluminium, if elongated aluminium dia is 2.5 mm?

1784


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Un-Answered Questions { Electrical Engineering }

What is error of a measurement?

600


what is a synchronizing lamp ?

965


why high speed tripping relay is used in protection circuit why not normal relay

828


c++ write a program to use a fuction call "max"which accepts an intger arrey of size5.as an arrument and return the larger and smallest of the arrey to main without changing. the original changing of the original position of the element of the arrey.

1447


Dear all, how we select the cable size according  to current with or without including different correction factor , is there any direct method for sizing of cable... 

1675






How Can You Relate Power Engineering With Electrical Engineering?

714


please explain how to do 'pole drop test' on generator?

2350


What is boucholz relay and the significance of it in to the trformer?

636


What is the comparison between 30mA DP RCCB and 100mA DP RCCB and can replace it against 63A MCB

1090


in dc series motor if field wdg is shorted then

1421


Mention the disadvantages of low power factor? How can it be improved?

644


What is the actual meaning of thermal power efficiency ?

1569


wow to calculate the transformer rating(KVA)

1655


how to find the Motor,s insulation Power?

1184


why impudance relay used for medium transmission power system? why not others?

887