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Electrical Engineering Interview Questions

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

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

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

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

1004I HAVE 2 nO'S OF SYSTEMS, HOW MUCH UPS CAPACITY REQUIRED ALONG WITH 400WATTS ANOTHER LOAD? PLEASE GIVE THE FORMULA?

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Un-Answered Questions { Electrical Engineering }

primery try cell?

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

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

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

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.

What is mean by hot and cold loop testing?

Why neutral is not used in three phases dol starter

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.

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

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

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

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

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.

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

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