Answer / tushar choudhuri

Rated interrupting time is the mean time for interruption of any current exceeding the rated interrupting current of the Breaker.The possible relaying time of modern high speed protection is 0.5 to 1,0 cycle.The breaker interrupting time of high speed modern circuit breaker is nearly 2 to 3 cycles.

how to get 48 V DC I have ... 1. 12 volt power supply board 2. DC power supply ( max. 30 v) 3. 9 volt batteries ( 2 - not chargeble)

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what is reactive poower

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In a company the lines carrying 33KV but the load is below 10000Volts so we know that <11KV we can put 11KV lines but the lines are 33KV,..so how we can step down the voltage to 11KV with out erecting a substation

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Why more than 2.5 MVA distribution transformers (secondary is 440V)are not used in india.

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back emf of motor at the time of starting ?

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Whether capacitor loads can be connected for testing a diesel engine at its full load capacity? Is there any limitation of capacotir load? Which is the best load for testing DG sets?

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why transformers not work at d.c.-

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While starting a high capacity motor, it takes 6 times the full load current. Why it doesn't trip relay or CB's in that network?

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why two wires are wound alternately to each other in single phase wires?

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Why should we use Star-Delta connection in step down power transformers?

7 Answers   L&T,

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what is the difference between normal motor and flame proof motor??

1 Answers   PI Industries, SRF,

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In the magnetic fluxes, what is the role of armature reaction?

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