What is derating?, Why it is necessary, it is same for all means for drives, motors,and cables.

1 Answers  

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how can we rotate a single phase motor (without cap.)in reverse direction?

2 Answers  

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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.

0 Answers   Pride Hotels,

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Why thwe Direction of Rotation of a TABLE Fan & CEILING Fan are different?

8 Answers   Wipro,

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send me any model test paper of clerical post of state bank of india.......

0 Answers  

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What is the fullform of NS fuse

2 Answers   Google, JAL International,

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How to calculate ant test the burden of Current transformer

0 Answers   NTPC,

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what is the basic need of domestic loads 1- voltage 2- current

0 Answers  

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what is the difference between ac ground and dc ground.. In my project iam using both ac and dc supply.. can both the grounds or the return paths be connected??

1 Answers  

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how does oil cools the transformer

3 Answers   HBL Power Systems,

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what is the relation between the size of the machine and the frequency? (when the frequency increases the size of machine will increase,why?)

2 Answers  

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what is the contact resistance of vacume circuit breaker??

1 Answers  

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