UJTs can only be used to trigger triacs, not SCRs. – McqOptions

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1.	UJTs can only be used to trigger triacs, not SCRs.
A.	True
B.	False
Answer» C.

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The triac is similar to an SCR, but it provides conduction for both halves of the ac wave.
The anode-to-gate voltage can be used to turn the PUT on or off.
UJTs can only be used to trigger triacs, not SCRs.
In an SCR-based half-wave phase-control circuit, a diode is connected in series with the anode.
The SCS is turned on with the cathode gate, and turned off with the anode gate.
The triac can be turned on or off by a pulse at the gate.
The SUS is also known as a Shockley diode.
The diac can conduct current in either direction and is turned on when a breakover voltage is exceeded.
The SCR is a device that can be triggered off by a pulse applied to the gate.
Thyristors are 4-layer semiconductor devices.

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