Answer / aravind

the reason for using carbon brushes is it has resistance which is good enough for avoiding sparking during commutaion.This feature is also present in copper but frequently carbon is used

Answer / niranjan reddy

because the carbon is of less cost. and as frequent wear and
tear will occur to the brush due to rotation of the
motor...carbon is most economical.
and frm conduction point of view also it is good..so carbon
is used

bsec exam syllabus (mis)

0 Answers  

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How can we measure the residual voltage in dc machines?

0 Answers   GPREC,

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what is electric current

17 Answers  

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Why Auto Transformer is called "Auto"? What is the logic?

1 Answers  

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can anyone give an idea about dia calculation in cold rolling mill

0 Answers  

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What's the differs between voltage & current & emf.

1 Answers   CTS, NTPC, TCS,

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describe the phenomena of vacuum interruption in C.B

0 Answers  

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Which one is correct mVA or MVA. Whether both the units are same for the transformer

10 Answers   Areva,

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what are the main faults that occur in stabilizers? How they corrected and resolved ? Types of stabilizers ?

0 Answers  

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What is the source of dependent source ?

0 Answers  

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If i switch on a transformer but with no load connected to the secondary path.Is the transformer will burn?

5 Answers  

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i have one transformer 1000kva, 11/.433kv. we are using 200/5 amp. ct unit for measuring purpose, & one 800 amp. V.C.B Unit for the same t/f operate, i wants to known the primary current of T/F is only 53 amp. why we used 800 amp. V.C.B ? & 200/5 amp. CT Unit.

4 Answers  

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