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Power Electronics

Q1: A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

A 1

B 0.707 lagging

C 0.5 lagging

D 0.2 lagging

ANS:B - 0.707 lagging

Single phase Full wave regulator : 2Thyristors.
a (total) = 90°.
a (each) = 45°.
Power factor : pf = cos45 = 0.707.



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