what is the function of a commutator in a dc generator?

14 Answers   College School Exams Tests, NTPC, TCS,

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What is the formula to calculate capacitor bank rating for a certain load.

2 Answers  

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22kV HT incoming should be 3 phase or 4 phase? why is it not 4 phase?

1 Answers  

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single phase for 230 then why three phase are 440 volt

4 Answers   ACIL,

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why wire sizes are 3/29 or 7/29 and why not wire sizes are 2/29 or 6/29?

0 Answers   OGDCL,

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what is the meaning of x,m,k in the relays?

0 Answers   ITC Infotech,

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can volts/Hz be relied upon to use 460v,60Hz electric motors on a 380v,50Hz power supply?

1 Answers  

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why electron not flow in open loop,how they know path is open ?

3 Answers  

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Mention the value of earth resistance and factors on which it depends on.

1 Answers  

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Why do we need ring main unit (RMU). what is its purpose and its advantages . what is the operating function of rmu

6 Answers   MahaDiscom,

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EXPLAIN THE FOLLWING: (1) BANDWIDTH (2) SELECTIVITY (3) RESONANT FREQUENCY (4) CURRENT MAGNIFICATION

1 Answers  

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i have a 4 Mva transformer 34.5 kv / 480-277 v and i used 2 parallel 3200 amp bus duct for the secondary feeder using 3 ply of bus bar ( 3/8" x 5" ) as a common where the flexible link terminated and 6300 amps breaker for the main, the lower bus duct reaches 70 degrees and the upper bus duct reaches 55 degrees when i used thermal scanner. why the temperature is not balance when the load reaches 3600 amps.

0 Answers   SCM,

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