Exercise: Power Electronics

Questions for: Power Electronics

The circuit in figure is for
A:
resonant commutation
B:
line commutation
C:
auxiliary commutation
D:
complementary commutation
Answer: D
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In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
A:
must be isolated
B:
may or may not be isolated
C:
should be preferably, isolated
D:
should not be isolated
Answer: A
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In a 3 phase full converter, the instantaneous output voltage can have negative part if
A:
firing angle is less than 60°
B:
firing angle is less than 90°
C:
firing angle is more than 60°
D:
firing angle is more than 90°
Answer: C
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Assertion (A): A DIAC has four layers but only two terminals.

Reason (R): A DIAC can conduct in both directions.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: B
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Mc Murray full bridge inverter uses
A:
4 thyristors and 2 diodes
B:
4 thyristors and 4 diodes
C:
8 thyristors and 4 diodes
D:
8 thyristors and 8 diodes
Answer: C
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