Why carbon brush used in dc motor also why its not used in ac motor?

2 Answers   RRB,

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how to write program by ladder logic in case of PLC operation

3 Answers   Gridco, Sofcon,

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What is the difference between diode and a transistor in terms of the direction of current flow?

0 Answers  

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why generator is design for lagging P.F(power factor)?

3 Answers   BSES,

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in our transmisison sub station why we step down firstly 132kv\33kv then 33kv to 11kv. can we direct step down 132kv to 11kv.

2 Answers  

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what is creepage distance

2 Answers  

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Does all the output contacts (N/O as well as N/C) of a Numerical relay operate when relay receives a binary input/inputs or contacts are designated to specific logic input/inputs and only these contacts operate?

0 Answers  

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I am shobana from Chennai. I am having my personal interview on 19th Dec at Chennai.kindly mail me the questions to mail id shobana.shanthi@gmail.com

0 Answers   Avalon, KK Capital,

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Why the transformers are rated in kva?

11 Answers   Birla, NTPC, Reddy Labs, Vijai Electricals,

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why we are using R,Y,B colours for 3 Phase ?

4 Answers   ITC Infotech,

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why our power production in multiple of 11, in strictlly asking why our o/p voltage of alternators is 11kv only and whynot graterthan 15 and016KV?

4 Answers  

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If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?

0 Answers  

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