Exercise: Power Electronics

Questions for: Power Electronics

In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is
A:
20 A
B:
13.33 A
C:
6.67 A
D:
3.33 A
Answer: B
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Assertion (A): When the anode current of an SCR starts increasing during turn on process, the anode cathode voltage drop starts decreasing.

Reason (R): During turn on the reverse biased junction in SCR breaksdown.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: A
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It is possible to use a freewheeling diode in
A:
single phase half wave controlled rectifier as well as in single phase full wave controlled rectifier (M - 2 connection)
B:
single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)
C:
single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier
D:
all controlled rectifier circuits
Answer: D
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In a full bridge single phase inverter feeding RLC load
A:
one thyristor and one diode conduct simultaneously
B:
two thyristors conduct simultaneously
C:
two thyristors or two diodes conduct simultaneously
D:
four thyristors conduct simultaneously
Answer: C
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In a half bridge inverter circuit fed by a battery of voltage V, the rms value of fundamental component of output voltage is
A:
2 V
B:
C:
D:
Answer: B
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