why -48 volts dc used in telecommucation

0 Answers  

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when running 2 nos 450kva dg sets in parallel operation ,in one Dg set power factor and Kvar going to lagging and ampere suddenly going high,please give me suggestion to correct the same.

2 Answers  

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define electrical field?

6 Answers   L&T,

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WHY THE +VE POLARITY OF 48V DC POWER SUPPLY IS USUALLY GROUNDED?

1 Answers   Tulip,

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if two bulb of 50w &30w apply in series having 230v the which bulb glow bright ,why

10 Answers  

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What are the point of a single core cable to be earthed?

2 Answers   Alfanar, Jindal,

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what is the HT motor current setting (Motor protection relay)aganist FLA If the capacitor is connected in parallal to the motor to increase the P.F from 0.89 to 0.99. the setting is to be reduced. what is the formula for to calculate the current.(FLA - CALCULATED CURRENT!= )

1 Answers  

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which is chemical used as in ro water what is difference betweeen multi grade filter&dual media filter

0 Answers   Dalkia,

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What is power transformer?

3 Answers   Welspun,

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will aqatic animal die if we ground the wire of three phase instead of grounding to earth

2 Answers  

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How to calculate energy stored in a capacitance

0 Answers  

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what is an isolation transformer??? what is its purpose??? what happens if it is not used where it should be used?????

2 Answers  

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