Exercise: Power Electronics

Questions for: Power Electronics

The condition for underdamped oscillations in a series RLC circuit is
A:
B:
C:
D:
Answer: B
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The number of leads in a DIAC are
A:
2
B:
3
C:
4
D:
6
Answer: A
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Forward rating of an SCR is
A:
the maximum rate of rise of anode voltage which will trigger the SCR
B:
the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is applied
C:
the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is not applied
D:
either (b) or (c)
Answer: C
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A crowbar circuit is generally needed for protection under fault conditions.
A:
True
B:
False
C:
D:
Answer: A
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In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th1 and Th2 respectively are
A:
0 to p and p to 2p
B:
a to p and p + a to 2p
C:
a to p + a and p + p to 2p + a
D:
a to p - a and p + a to 2p - a
Answer: C
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