Thyristor convertor type AVR(Automatic Voltage Regulator) is made of Thyristors(Silicon Controlled Rectifiers,SCRs). We know that output DC voltage from an SCR will not only depend upon the r.m.s. value of Input voltage applied, but also at the angle at which the input AC cycle is fired (using gate signal). If the firing angle is zero(in a simple circuit), then maximum DC output voltage will be obtained.If the firing angle is changed from 0 to 180,then maximum to minimum voltage is obtained. This property could be used to build an AVR. The firing angle proportional to Output voltage could be used to trigger the thyristor,in a closed loop manner and a nearly constant DC voltage(Average Value) can be obtained.An invertor circuitory could be utilised to get a regulated AC supply. Many other configurations can be build from thyristors to get a regulated AC supply.

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Which are the Duties of H.R. & H.R.Department?

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Any idea of SBI clerical joing date

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Hiii can anybody tell me which books are best preferable for the preparation of Group1 and Group2 prelims. Also the price of the books. Please post ur ansrs 2 this question

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I have all my service certificates of current and previous employer attested by hr of the company in the original one,do i need to again attest photocopies of the same(i.e service certificates) with a government officer. can any one respond to the query at the earliest I have done attestation on the other photocopies of the certificates.

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hello , i am sumit.,,. if anybody need sbi po material ,., and marketing questions .,,.. contact me,.,. i can help u,.,,.

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salary expectation ?

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