Exercise: Power Electronics

Questions for: Power Electronics

The output frequency of a cycloconverter can be changed by changing the firing angle.
A:
True
B:
False
C:
D:
Answer: B
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If the frequency is less than the damped frequency in a series- inverter
A:
the distortion of output voltage waveform is low
B:
the distortion of output voltage waveform is high
C:
the distortion of output voltage may be high or low depending on the load impedance
D:
none of the above
Answer: B
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The efficiency of a chopper circuit is about
A:
80% or more
B:
around 50%
C:
around 20%
D:
around 5%
Answer: A
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A class D chopper
A:
can operate in first quadrant only
B:
can operate in second quadrant only
C:
can operate in either first or fourth quadrant
D:
can operate in all the quadrants
Answer: C
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In sinusoidal PWM for inverters the width of different pulses are not the same.
A:
True
B:
False
C:
D:
Answer: A
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