Why use only DC supply to charge batteries why not AC Supply??

3 Answers   APC, Emerson,

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HOW TO CALCULATE THE LOSSES OF CURRENT FOR LT CABLE JOINTING TO MOTOR SUPPLY.

2 Answers  

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If we have a 2000kva load,How much kvar capacitors we go to add to improve the power factor at 0.9?pls give the calculation and fully theory?

2 Answers   ABB, Unitech,

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why we use to transmit the power in three phases intead of single phase ?

5 Answers  

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If I have a motor of 1MW with 6.6kv, running at 35% load, how can i save energy without reducing the load ?

2 Answers   Reddy Labs,

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what is the operation of Control Module(CM),MONITOR Module(MM), MONITOR Module DUAL (MM2),Signal Module(SM),Isolator Module(IM), please some one reply me.. the operation and application of these in FIRE ALARM SYSTEMS...

1 Answers  

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what is dc system? how getting pulse from rectifier?

1 Answers   ETA,

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A cylindrical wire is compressed in length by 10%. The percentage decrease in the resistance will be?????

0 Answers  

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what do you mean by PF correction. A motor is rated at 15 kw,415 volts, 0.7 pf and eff of 0.92. The powerfactor is improved to 0.98 by adding capacitors at the bus. calculate the current drawn by motor under full load condition before and after pf correction

5 Answers  

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why generally transformer are in star to delta or delta to star used?

8 Answers   ABB,

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What happen if ac supply is fed to rotor of the alternator?

1 Answers  

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what is quality factor in series resonance circuit and calculate the factor of voltage magnification? how it happens?

0 Answers   BARC,

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