21.in a three-phase full converter, output voltage pulsates at frequency of
a. f    b. 2f    c. 3f     d. 6f

22.in a three-phase full  converter, every SCR conducts for-
a.60deg.     b. 120deg.    C.180deg.    d.90deg 

These are some of the questions which I could remember. If you have looked to all the above mentioned section, its quite a simple paper for you. i hope this paper help you in your preparation.
ALL THE BEST for whatever you are preparing for. 

Author: Hari

Placement-World Team

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