Exercise: Power Electronics

Questions for: Power Electronics

Assertion (A): Gate triggering is the most commonly used method for triggering of an SCR.

Reason (R): Even a small gate current is sufficient to turn on an SCR.

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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Modified Mc Murray full bridge inverter uses
A:
4 thyristors and 2 diodes
B:
4 thyristors and 4 diodes
C:
8 thyristors and 4 diodes
D:
8 thyristors and 8 diodes
Answer: D
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The power factor at the input terminals of a cyclo- converter is generally
A:
low and leading
B:
low and lagging
C:
high and leading
D:
high and lagging
Answer: B
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The application of gate signal decreases the break over voltage of on SCR.
A:
True
B:
False
C:
D:
Answer: A
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A static excitation system uses
A:
transformer and thyristors
B:
transformer and ac exciter
C:
dc exciter and ac exciter
D:
transformer and dc exciter
Answer: A
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