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Electrical Engineering Interview Questions

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.

1026

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.....

1090

what is conductor constant of raccun conductor

1131

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)

1211

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

4209

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

2602

How dc generators direction can be reversed ??

4000

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

3115

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

1675

What is meant by vector group

1464

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

2022

working function importance of mdc meter

1232

what is inter connected dc generator?

1722

Is there is any difference between AC and DC Cables

5171

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

1295

Un-Answered Questions { Electrical Engineering }

how to setting voltage RTCC panel

668

how we decide wire gauge for ac or dc coil and what is the basic diff. B/w these two coil?

1063

one split ac how can told of this ac which Tr tell me us

1045

which of the following elements is not present in stainless steel

1465

which are the criterias needed to select the kind of neutral earthing(solid earthing,resistance earthing,etc.) at various voltage levels in electrical distribution?

1042

Does all the output contacts (N/O as well as N/C) of a Numerical relay operate when relay receives a binary input/inputs or contacts are designated to specific logic input/inputs and only these contacts operate?

1174

1. If 8.35%Z means the percentage impedance of 132kV-line from power company, we will like to reconfirm its base capacity.

1009

Diagram and details of polarity test for Current Transformer 11kv 400/200/100/1A

2055

What is the capacity of the Fastners 12mm?

1400

why the colour of insultor stack , petticoat is brown. Is it has some technical reason.

1122

In the magnetic fluxes, what is the role of armature reaction?

192

In convertor can we use rectifier thyristor in place of invertor thyristor with explain.

928

The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.

1065

Why you want to join non technical field when you are an engineer?

4267

What is industrial plc

802