Exercise: Power Electronics

Questions for: Power Electronics

The output wave of a cycloconverter consists of a number of segments derived from the input wave.
A:
True
B:
False
C:
D:
Answer: A
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An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
A:
25 A
B:
12.5 A
C:
less than 25 A
D:
less than 12.5 A
Answer: D
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The cut in voltages for germanium and silicon diodes respectively as
A:
0.3 V and 0.7 V
B:
0.7 V and 0.3 V
C:
0.6 V and 0.9 V
D:
0.5 V and 0.7 V
Answer: A
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In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is
A:
1
B:
2
C:
3
D:
4
Answer: D
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The factor η for a UJT is about
A:
0.1
B:
0.2
C:
0.6
D:
0.9
Answer: C
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