Answer / balamurugan

online ups no change over time (0 ms)from EB supply to Battery supply. offline ups some mls time to change over from EB supply to battery supply (more or less 3 ms )

Any website for objective type questions of electrical engineering ?

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how wud i know that whether i have to use unitized package substation or transformer?

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why would the rotor rotate at sub synchronous speed against the direction of rotating flux when d rotor of 3 phase IM is connected to 3 phase balanced supply and the stator windings are shortcircuited ??

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all details of DG UPS HVAC

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Why is the air gap between the pole pieces and the armature kept very small?

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can the measured percentage error during calibration of single phase energy meter be negative?

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i want to know how to determine that a surge arrester work properly in 11kv system. and how to test a 12kv surge arrester

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What is the relay function?

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dc supply given to dc generator winding.how is possible? my knowledge is saying the winding will burn. please reply.

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1)What will happen when 240 VDC supply is connected to 240VAC supply(DC supply +ve is connected to phase of AC supply & DC supply is to neutral of AC supply). 2)Also what will happen when 240 VDC supply is connected to 240 VAC supply in reverse polarity as of Sr. No 1.

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Why 66KV is step down to 11KV and then 433v, not directly 66KV to 433v ?

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How will calculate losses in an multi core Aluminium LT cable of different sizes & upto what length we can use a LT Cable ?

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