Exercise: Power Electronics

Questions for: Power Electronics

A single phase bridge type cycloconverter uses eight thyristors.
A:
True
B:
False
C:
D:
Answer: A
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A voltage VBB is applied across the terminals of a UJT. The emitter voltage at peak point is
A:
hVBB
B:
(h + 1) VBB
C:
hVBB + VD
D:
VD
Answer: C
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If a step down chopper is fed by a dc voltage V with Ton and Toff are on and off periods then is
A:
average output voltage
B:
rms output voltage
C:
average or rms output voltage depending on load
D:
neither of the above
Answer: A
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As compared to BJT, MOSFET has
A:
lower switching losses and higher conduction losses
B:
higher switching losses and higher conduction losses
C:
higher switching losses and lower conduction losses
D:
lower switching losses and lower conduction losses
Answer: A
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All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation
A:
has the same peak thyristor current as in 120° mode of operation
B:
has higher peak thyristor current than in 120° mode of operation
C:
has lower peak thyristor current than in 120° mode of operation
D:
any of the above
Answer: B
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