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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is earth fault relay 64T, why it is used in main Incomer and neutral CT of Transformer.

2083

can we use ps class in combination with protection class in differential protection and over current protection.

1 1486

What is the output of a transformer..??

Jindal,

1 3085

What device is use for metering current at lt consumer end..??

Power Grid,

2 4734

How many devices can be connected in one zone of FACP

1356

what is interference

L&T,

1 1794

What is the maximum current carrying capacity for both copper and aluminium cables for 1sqmm?

2 2745

HOW TO CALICULATE THE LEAD ACID BATTERY AH AND HOW TO FIND THE 1.2KVA UPS BACKUP @ 1000WATTS LOAD?

2 2666

WE HAVE THE DC RECTIFIER 1500A, INPUT VOLTAGE IS 3 PHASE. HOW TO CALICULATE THE LOAD? 3 PHASE SIDE EITHER dC SIDE. PLEASE SUGGEST ME

1004

I HAVE 2 nO'S OF SYSTEMS, HOW MUCH UPS CAPACITY REQUIRED ALONG WITH 400WATTS ANOTHER LOAD? PLEASE GIVE THE FORMULA?

1 2204

can i connect wavetrap in 2 different phase in EHV line?

958

what is ALF and ISF in current transformer?

1 9614

how can i use REF and diffrencial relay both in 1 CT core for transformer protection?

897

can i connect REF and Differencial relay in 1 CT core for transformer protection?

1027

What is grid collapse? what is the reason for it?

1063


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Un-Answered Questions { Electrical Engineering }

primery try cell?

1094


How will you justify IR value and Charging voltage of any motor,transformer and Cables.......???? . . . . . . . . Plz tell me any body Baljeet Singh, engineer_89@refiff.com

1172


what is the basic need of domestic loads 1- voltage 2- current

1037


give single line diagram of D.G distribution form alternator to main L.T panel?

6426


A ray hit a smooth regular surface at an angle of 20 from the normal. Calculate : 1. The angle btw the incident and reflection ray. 2. The angle of deviation.

1027






What is mean by hot and cold loop testing?

202


Why neutral is not used in three phases dol starter

974


Why do we need a separate control desk & PLC control panel in Boiler plant or coal handling plant? Can we provide cost effective Control desk cum PLC panel. Is there is an specific need for control desk.. kindly advice.

1417


why effective resistance should be more than static resistance in transmission line?

1138


why occ characteristics of generator is also called as magnatization characteristics ?

1003


The Q-facr o of a coil given as wL/R. what will be shape of Q versus frequency graph.

1080


The series field winding has low resistance while the shunt field winding has high resistance. Why?

396


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.

1061


can we do the star delta connection of capacitor for 3- phase motor starter.

1109


if we run a 3 phase machine on two phase what will happend??? given answer with solid reason please

1186