why we use ac supply as 415 volts instead of 415 v why we cant apply 230 v for dc

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What is the minimum percentage of power that a powerplant can support in ilanding mode ?

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what is the defination of Cable database? What are the points are considered while preparing cable database? Is there any sample available for cable database?

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In DC current-excitation to transformer, why it sucks more current? Eventhough there is no power transfer between primary and secondary? R is very low so it should suck less current only na thn y its current increases?

2 Answers   Cairn,

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what is the difference between delta delta and star delta connection transformer? why we use delta delta transformer since it need earthing transformer for grounding?

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a 230v transformer with step down ratio 19:1.it has 2000turns on primary and rated 25va calculate max primary current no of secondary turns volts/turn

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what are feeder pillars & panels?

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* Signal transmission in sky wave propagation is due to ? a) Reforction of wave b) Reflection of wave c) Pierus through Inosphere d) None and Reason for this is????

2 Answers  

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what is the effect of leading power factor on Power transformers in existing in major power utility

2 Answers  

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what is basic difference betmeen normal & flame proof motor??

0 Answers   Dynamics,

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What is the value of system voltage?

2 Answers   Bhel,

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I have 1 KW, 3ph. 440v, 50 hz, cos(phi) .75, efficiency 75%(star delta connection)Motor. How to calculate line current & Phase current (1) Star connection (2) delta Connection

2 Answers  

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