The function of connecting a zener diode in an UJT circuit,

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The function of connecting a zener diode in an UJT circuit, used for the triggering of SCRs, is to—

1. expedite the generation of triggering pulses
2. delay the generation of triggering pulses
3. provide a constant voltage to UJT to prevent erratic firing
4. provide a variable voltage to UJT as the source voltage changes

Correct Option: C

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