03/03/2020

Programmable Unijunction Transistor ( PUT ) Interview Question Answer


1
Write the full form of PUT.


PUT : Programmable Unijunction Transistor


2
Write the full form of CSCR.


CSCR : Complementary silicon controlled rectifier

3
Describe the main features of the PUT.


The main feature of the PUT is that its triggering voltage VP can set by external circuit.

4
How many junction the PUT consists of?


Three junction

5
Describe the advantages of PUT over UJT.


Advantages of PUT
  • The triggering voltage can be set by external circuit.
  • Low peak voltage as compared to UJT


6
Why the PUT is called as complementary SCR?


  • The gate of the PUT is connected to anode side whereas it is connected to cathode side in the SCR therefore it is also called as complementary SCR.


7
Why the value of the capacitor in the PUT relaxation circuit is kept as low as possible?


  • The value of the capacitor in the PUT relaxation oscillator circuit is kept as low as possible because large value of capacitor requires electrolytic capacitor which suffers from high leakage.




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