Answer Posted / Upendra Singh

Adjusting a rheostat to obtain a specific reading on a voltmeter, such as 380V, is typically done during testing or calibration processes. The exact reason for setting it to this value would depend on the specific application and requirements.

What is the basic principal, by which DC voltage level is increased more than the supplied AC voltage during conversion. As upto AC level it is contorrled by firing anlge but after maximum level how is it possible.Please clear picture. OR we have to supply the higher level AC?

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