what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors

0 Answers   Lanco,

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What voltage is used in Directional earth fault relay? and why?

5 Answers   L&T,

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define excitaton voltage and excitation current?

2 Answers   Allied Group,

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single phase 230v three phase voltage 415volt why we aren't used line voltage 690v?

7 Answers   Citec,

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How to select the proper VSD to operate high inertial load

0 Answers  

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Will The Rated Capacity of 20 MVA ,220/6.6 KV, ONAN cooling Power Tranformer be increased up to 25 MVA with respect to its %Impedence by ONAF cooling with same rating..?

2 Answers   Ambuja,

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can anybody tell me that for p.f. Improvment we use capacitor banks but how to decide its capacitance. As we all know how to calculate kvar but what abt capacitance value

0 Answers  

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does magnetic interlocking take place in an induction motor ?

2 Answers  

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hey guys i recently saw a long transmission line in which a sort of balloons in red and white color were hanging at each section.do u have any idea why are they kept for?

3 Answers  

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how to improve IR value in HT motors?

3 Answers   ABB, AMW, Macleods,

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The Howland current source produces a A Unidirectional floating load current B Bidirectional single-ended load current C Unidirectional single-ended load current D Bidirectional floating load current

0 Answers  

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why transformers are sometimes kept on concrete benches..?

2 Answers  

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