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A thyristor can be termed as ______

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A thyristor can be termed as ______

(a) AC switch

(b) DC switch

(c) Wave switch

(d) Square wave switch

I had been asked this question by my school principal while I was bunking the class.

Enquiry is from Power BJTs in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right answer is (b) DC switch

To explain I would say: Thyristor is a unidirectional device, that is it will only conduct current in one direction only, but unlike a diode, a thyristor can be operate as either ran open circuit switch or as a rectifying diode depending on how the thyristor gate is triggered.  In other words, the thyristor can operate only in switching mode.

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