how to calculate efficiency of voltage and current controlled welding transformer?

1 Answers  

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what is the effect of higher value of GD???

0 Answers   VEPL,

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how to give earthing in ships?

1 Answers  

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what is the back ground of transformer working? applying voltage to primary and emf inducing in primary and secondary? how it is possible? please answer me with scientific approach?

5 Answers  

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can we use inductor in case of d.c.,if yes then what will happen in circuit

3 Answers   JSW,

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What is the need of motor starter?

6 Answers  

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what relation between transmission line & communication line?

1 Answers   NTPC,

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Why battery is always operate on dc supply?

1 Answers   Vikram Ispat Industries,

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How the flights will be fly be fly without ground connection under raining with thunder lighting?

1 Answers  

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why T/F winding temp measurement cts are odd secondary current ie,109A/1.2A/1.4A?

0 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

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what is the apt definition for kirchoff's current and voltage laws?

3 Answers  

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I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?

0 Answers   US Electrofused Minerals,

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