Exercise: Power Electronics

Questions for: Power Electronics

The main utility of SCR is due to
A:
gate triggering
B:
high temperature triggering
C:
triggering
D:
high breakdown voltage
Answer: A
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A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of thyristor current is
A:
B:
C:
D:
Answer: B
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In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is
A:
150 A
B:
75 A
C:
50 A
D:
300 A
Answer: A
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In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is a. Then the waveshapes of voltages across thyristors
A:
are similar
B:
are not similar
C:
may be similar or dissimilar
D:
are similar only for some values of a
Answer: A
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A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be
A:
47°
B:
less than 47°
C:
more than 47°
D:
either more or less than 47°
Answer: C
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