Exercise: Power Electronics

Questions for: Power Electronics

Typical values of for an SCR are in the range of
A:
1 to 10
B:
25 to 500
C:
0.1 to 1
D:
1000 to 2000
Answer: B
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A single phase half bridge inverter required to feed R-L loads needs
A:
2 thyristors
B:
4 thyristors
C:
2 thyristors and two diodes
D:
4 thyristors and 4 diodes
Answer: C
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The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is
A:
VIT
B:
C:
D:
Answer: D
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In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is
A:
1
B:
2
C:
3
D:
4
Answer: B
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In a single phase full wave ac regulator the firing angles during both half cycles are equal.
A:
True
B:
False
C:
D:
Answer: A
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