why 30kva ups buzzing(hamming) sound?

2 Answers   Madhya Pradesh Electricity Board MPEB,

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Which types of following motors are most efficient?

0 Answers  

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In induction machine when the load increase the current will increase .why? what is the relation ship between the sleep and current drown by stater?

1 Answers  

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in 220/132 substation in place of PT what equipment used & what r the role of that equipment

2 Answers  

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what sort of general awareness questions are asked in o.n.g.c entrance exam?????????????????

0 Answers  

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how to set relay setting? and example calculation...

0 Answers   JSW,

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How phase displacement change in the over current relay coils.

0 Answers  

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what happens when one of the phases out 0f 3 phases been removed under working condition and no load condition will the machine run if so plz send me why

2 Answers  

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what is the formula for AH?HOW CAN IT CALCULATE

1 Answers  

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Write masons gain formula.

0 Answers  

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I have 150/1A Rating CT Suppose if i inject 15A in CT " Secondary" means what will happen ??????

1 Answers  

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What is mean by discrimination of circuit breaker ?

1 Answers  

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