03/03/2020

Triac - Interview Question Answer


1
State the full form of the TRIAC.


Triode AC switch


2
Why the Triac is called as bidirectional?


The conduction of the triac is done either polarity of the supply voltage therefore it is called as bidirectional.

3
How many terminals the Triac consists of?


Three : MT1, MT2 and gate

4
Which semiconductor device requires more gate current in order to turn it on? Triac OR SCR


SCR

5
Whether the Triac is turned on by positive gate current or negative gate current?


Either positive or negative gate current

6
Give reason : The Triac is rarely operated in the first quadrant with negative gate current and third quadrant with positive gate current.


Due to less sensitive

7
In which quadrant of the operation, the Triac has greatest sensitivity?


First quadrant with gate positive gate current and third quadrant with negative gate current.

8
State the advantages and disadvantages of the Triac.


Advantages of the Triac
  • Bidirectional
  • Only single fuse requires for protection
  • The Triac requires only one heat sink of larger size whereas the two anti parallel SCRs requires two heat sink of smaller size.


Disadvantages of the Triac
  • Low rating as compared to SCR
  • Less reliable
  • Low dv / dt as compared to SCR




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