Other Electrical Engineering Interview Questions 

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present we are having 0.8pf but I want increase it up to
0.99 so what is the formula for it and how can i calculate? 
ABB 
3 
what is mean by derating factor?

Essar 
3 
how can calculate static 3phase 4wire CT & PT operated
energy meter constant when calibrating using refference
meter suppose we have 11kv/110v PT and 30/5A CT, the meter
constant is 160imp/kwh, where meter is showing MW energy?
give me solution which constant i feed in my refference
meter for calibration of energy meter? 

3 
what is the earth to neutral voltage(maximum and minimum)
according to ieee standards 

4 
What conditions are required for a transformer to operate at
low frequencies ? 

1 
Sir,
how to calculate the voltage drop and short circuit current
of cable. please give me example and formulas. 

1 
What is mean by Sub Synchronous Resonance(SSR)??? 

1 
what is thyristor, how is it works 

1 
why shunt capacitor is connected 

1 
principle of power export and import in captive power
plant.Is it depends upon voltage,current or frequency?Plz
explain briefly. 

1 
why transformer comes only in standard rating like
11kv,33kv,66kv....and not like 33.33kv and so on? 

3 
if the length, number of turns and area of coil are doubled
then inductance of the coil becomes.? 

1 

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