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.

whatis the test procedure for lightning arrester which was installed one year back. i want check it whether it is working or not.

1 Answers  

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if i have 5kw,9A,three phase induction motor,if i want to install it 100 meter away from its feeder,how i will culculate cable size for this load.

2 Answers  

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purpose of check value

1 Answers   Seagate,

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sir, i want to know the calculation for find rated current for cable sizes.(both copper & aluminium) with examole. please sir for example: 35sq.mm al.cable is withstands for how many amps? is suitable for 45kw motor?

5 Answers   L&T,

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Q2). When 3 dice are simultaneously thrown, which of the following would be obtained? (a) Result 1: “A 5, a 3 and a 6” (b) Result 2:” A 5 three times” (c) Result 3:”A 5 twice and a 3” (d) All three results are equally likely. (Musigma Question)

2 Answers   Mu Sigma,

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What is the difference of grounding and earthing?

6 Answers  

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what is ASCR cable and where we use it?

6 Answers   BSL,

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why we r not earthed Control cable of C.T. terminals

0 Answers   HCC,

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why are u join ntpc

0 Answers   NTPC,

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How many VSC based HVDC are there in India and the world

0 Answers  

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What is difference between unity power factor wattmeter and upper power factor wattmeter? In short circuit test of transformer the wattmeter used is unity power factor type or upper power factor type wattmeter?

0 Answers   Jindal Steel and Power,

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-----------means a source which can supply a constant voltage to aload irrespective of the valu of load resistance.

2 Answers  

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