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.

Your B.tech marks is being given in CGPA grade. How is it calculated?

1 Answers  

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why the auxilary(starting)winding is provided in single phase inductoin motor?

5 Answers  

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What is Meter MF if External CT Ratio is 150/1 , PT Ratio is 132/110 Meter CT Ratio is 200/1 & Meter PT Ratio is 110/1

1 Answers  

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What is a unit of gravity (Battery)

9 Answers  

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How would you supply power to a village which is very far from a sub-station and has only a 11kV line running near by?

3 Answers  

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why the voltage level in transmission line are in multiple of 11kV, 22kV, 33 kV etc..( i.e., 220 V )?

4 Answers  

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why the stator is not laminated in DC machines?

4 Answers  

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what is the Transformer Protection & Type ??

4 Answers   GE,

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What is working principal of V.C.B., O.C.B., A.C.B & Over load relay?

4 Answers   Unitech,

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HOW TO CALCULATE UPS BATTERY BACKUP TIME

3 Answers   HSBC, VRVS,

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why used in starter in tube ligtht circuit.

4 Answers   College School Exams Tests, HP,

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Though transformer consist winding which usually cause reactive power change in both generator and motor but it wont affect reactive power passing through transformer why?

2 Answers   Jindal, Reliance,

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