3) How earthing is done? How it measured? Write the method for earthing? How the earth resistance is kept low?

1 Answers   Innovative Energy,

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What is derating?, Why it is necessary, it is same for all means for drives, motors,and cables.

1 Answers  

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what we happen if 400 kvar cpacitor banks are on in manual mode and there is no load on mains ??????????????

7 Answers   HCL, Reliance,

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why 3 phase motors are preferable over single phase motors ?

4 Answers  

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we all know that corona is nothing but ionization of air around the conductor and there by allowing current to pass through ionized air.but we are not getting any short circuit in between the respective phases though the air turned as a conductive media between them??

1 Answers   Siemens,

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if the 10 hp motor name plate indicates rated current as 13.6 amp the what will be the thermal relay setting? Why? And in how much time relay will trip at the set value?

2 Answers  

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what is the difference b/c choke and ballast?

1 Answers  

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which is the best, A/C DRIVES or D/C DRIVES for cranes,...... ...and why......?

2 Answers   Alstom,

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how can we change the supply voltage?

4 Answers   Areva,

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what is the meaning of DY-11 Z-5%

1 Answers  

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in Contactor opearation Why there is a difference in the values of the operate and release voltage in case AC supply

0 Answers  

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what is the tolerance of electrical frequency for India? it's .5% or 1%?

8 Answers   Engro,

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