Answer / sayyid ahamed pm

at the time of opening of cb more current and high voltages are causes to produce high arc due to air and moister are help to produce fire

Answer / mostafaghodrat

vaciuum c.b is advanced.

At the moment arc, and the keying is more effective.
air c.b is more expensive.

how to mesure the earth pit value and what is the minimum value of single earth pit?

3 Answers  

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why the capacitors works on ac only

5 Answers  

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What is the work of IGBT in ups?

2 Answers  

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Define the overload capacity of the motor?

0 Answers  

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In a single phase converter, the no. of SCR conducting during overlap? a.1 b.2 c. 3 d. 4

3 Answers  

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what is the function of choke in the flourcent tube lights and why the colour is in white mostly in flourcent tube lights

0 Answers  

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dear sir/madam i want to get some knowledge about RRB EXAMINATION(section engineer) 1- what is minimum cut off 2- wht portion is major portion . 3- can any body provide Sample paper. thanks & regards ashish

0 Answers   RRB,

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what is MUSS?

1 Answers   HP,

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why all selected supply voltages are multiple of 11.i.e440,11 kv,33 kv,66 kv,110 kv etc

6 Answers   Suzlon, TCS,

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what is onan, onaf, ofan, ofaf in transformer?

8 Answers  

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In case of power/distribution transformer what is percent impedence?

1 Answers  

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what is meant by PU value ? anyone can you explain briefly to me ?

3 Answers  

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