The acquisition of negative resistance takes place in UJT in the regenerative process when

Q.  The acquisition of negative resistance takes place in UJT in the regenerative process when_______
- Published on 20 Oct 15

a. Both VE & IE increases
b. Both VE & IE decreases
c. VE increases & IE decreases
d. VE decreases & IE increases

ANSWER: VE decreases & IE increases
 
When emitter voltage becomes exactly equal to peak voltage, the current (Ip ) flows through the resistance to ground causing the UJT to get turned ON.

It is obvious that as VE & IE rises beyond current, the values of base resistance and intrinsic stand-off ratio decreases.

Thus, the process becomes more regenerative by further reduction in emitter voltage since emitter current increases.

With an increase in emitter current , the emitter voltage decreases. Due to this, UJT possesses negative resistance .

Furthermore ,the consequences shows variations when UJT is in saturation mode beyond the valley point and therefore, emitter voltage increases.

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