Exercise: Power Electronics

Questions for: Power Electronics

Natural commutation can be used in :
A:
DC circuits only
B:
AC circuits only
C:
both AC and DC circuits
D:
none of the above
Answer: B
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A chopper cannot be line commutated.
A:
True
B:
False
C:
D:
Answer: A
No answer description is available. Let's discuss.
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In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
A:
are always similar
B:
can never be similar
C:
may be similar or dissimilar
D:
are similar only if a = 0
Answer: A

For resistive load output current is always proportional to output voltage.

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In controlled heating circuits, thyristors act as
A:
rectifier
B:
inverter
C:
ac regulator
D:
chopper
Answer: C

The output voltage is controlled ac.

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When the core of a saturable reactor is saturated, the inductance is high.
A:
True
B:
False
C:
D:
Answer: B

Since core is saturated, change of flux is small and inductance is low.

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