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A Shockley diode can be used

in place of SCR
as a trigger switch for SCR
in place of UJT
both in place of SCR and as a trigger switch for SCR

Correct Answer: as a trigger switch for SCR

Explanation:

It is a four layered PNPN device without a gate terminal. Its characteristics is similar to that of SCR with zero gate current. It is acting as a trigger switch for Thyristor.

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