Answer / keval

magnitude of leakage flux

Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

1 Answers   Pride Hotels,

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When steam condenses and becomes water at the same temperature, the specific heat for the process in kJ/kg k is

1 Answers   Caterpillar,

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State thevenintheorem?

1 Answers  

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Why Phase to Neutral get spark

2 Answers  

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1.why we are using blocks in withoutgaplightning arrester 2.why we ar using bushing in withoutgap lightning arrestor

1 Answers  

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Define pole pitch?

1 Answers  

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It is a three inch fan and i want it to rotate to other direction .I've tried cutting the wire and reconnecting them inverse like black to white and white to black ,but it won't start rotating when i plug it in that way.And then it works again when i rejoin the wire to the way it is. I don't know what causing the problem.Is there anyone familiar with these small mortor?Any suggestion would be appreciated.Thanks!! http://i296.photobucket.com/albums/mm163/sasukebloodwheel/110527-105859.jpg

2 Answers  

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what is difference between RCB,RCCB &RCBO?

3 Answers   ABB,

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I have calculated load for an office building which is 1200 KW as all the load is single phase therefore its 1200 kw single phase. Now i have to design Transformer and Generator for this load Please kindly give me exact answer that how much capacity of Three Phase Transformer and Three Phase Generator is required for this load.

3 Answers  

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how to calculate the Neutral transformer impedance?

1 Answers   Schneider,

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what is the working principle of smoke detector in fire alarm system

2 Answers   Vijaya Bank,

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How can we connect additional batteries to three phase ups? What are parameters we have to check when connecting?

1 Answers  

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