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Power Electronics

Q1: In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle

A is zero

B is 60°

C is more than 60°

D is more than 90°

ANS:C - is more than 60°

In a three-phase system, free-wheeling diodes operate whenever the system suddenly turns off. In three-phase operating more than 60 degrees switch the system in a nonconducting state.



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