Answer / parmod kumar

it has the same two power sources, and a transfer switch
that selects between them. It is the exact opposite from
the standby UPS because it has reversed its sources: in the
online UPS the primary power source is the UPS's battery,
and utility power is the secondary power source!
Under normal operation the online UPS is always running off
the battery, using its inverter, while the line power runs
the battery charger.

Is 3 phase induction motor can work as a generator?? if so why & how??

2 Answers   Jindal,

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What is the effect of interchanging core(made of steel) and winding(made of copper) material in case of transformer? Give proper explanation in regard to different losses in transformer.

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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

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explain Xmer

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sir i have a car stereo system and there is jack on him so can u tell me a way to find out their power terminals on the jack or on the circuit board"

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How many Zones can be in Conventional type fire alarm system & how can we detect the fire in Conv. type FAS?

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234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

0 Answers   Jomel,

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which level of transformer oil has got low dielectric strength ?why?

2 Answers  

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how the transmission voltage ranges are decided like 11kV,33kV,66kV,132kV,220kV,400kV,725kV.... why not choose the transmission line voltage as 23kV,164kV,440kV?? what's the reason??

3 Answers  

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ups battery design formula

0 Answers   Amara Raja,

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Can you explain about TEE protection scheme?

0 Answers   Voltech,

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which pump used in WTP explain the function of VFD how to dtermine capacitorbank of capacity one plant

0 Answers   Dalkia,

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