Exercise: Power Electronics

Questions for: Power Electronics

A dc chopper is feeding an RLE load. The maximum steady state ripple is
A:
B:
C:
D:
Answer: A

(Imax - Imin)max = .

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The average load current supplied by a thyristor depends on
A:
firing angle
B:
firing frequency
C:
magnitude of gate current
D:
all of the above
Answer: A

The firing angle controls the period of conduction and hence average load current.

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A 3 phase ac regulator uses
A:
3 thyristors
B:
6 thyristors
C:
9 thyristors
D:
12 thyristors
Answer: B

Two thyristors for each phase.

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Which of these triggering methods for series connected SCRs use LASCR in the gate circuit?
A:
Resistance triggering
B:
Simultaneous triggering
C:
Sequential triggering
D:
Optical triggering
Answer: D

Optical triggering uses LASCR.

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A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to
A:
one half wave of output
B:
one full wave of output
C:
two full waves of output
D:
either (b) or (c)
Answer: B

Since output frequency is 2f, one half wave of input must equal one full wave of output.

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