Exercise: Power Electronics

Questions for: Power Electronics

A fully controlled bridge converter feeds a highly inductive load such that the load current can be assumed to be constant. The wave shape of input current is
A:
dc
B:
sinusoidal
C:
rectangular
D:
none of the above
Answer: C
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McMurrary full bridge inverter uses
A:
auxiliary commutation
B:
complementary commutation
C:
natural commutation
D:
any of the above
Answer: A
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In integral cycle control of ac regulator, the input power factor is equal to
A:
duty cycle a
B:
a2
C:
a
D:
(a)1/3
Answer: C
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A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ωt and firing angle is a. If average current is I0, then
A:
cos a = RI0 + E
B:
cos a = RE0 + E
C:
cos a = E0 - RI0
D:
cos a = E - RI0
Answer: A
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In a 3 phase semiconverter, the output voltage becomes discontinuous for
A:
firing angle > 30°
B:
firing angle > 60°
C:
firing angle > 90°
D:
firing angle > 120°
Answer: B
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