Exercise: Power Electronics

Questions for: Power Electronics

A thyristor circuit is feeding an R-L load. The turn on time can be reduced by
A:
decreasing R
B:
decreasing L
C:
increasing L
D:
decreasing R and L together
Answer: B
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Which chopper circuit uses saturable reactor?
A:
Auxiliary commutated
B:
Jones chopper
C:
Morgan chopper
D:
Load commutated
Answer: C
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In auxiliary commutated chopper, the charging and discharging time of capacitor
A:
are constant
B:
depend on load current
C:
may be constant or may depend on load current
D:
none of the above
Answer: B
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When a UJT is used as a relaxation oscillator the current should be
A:
less than Ip
B:
more than Iv
C:
more than Ip but less than Iv
D:
negative
Answer: C
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Assertion (A): An ac regulator uses natural commutation

Reason (R): An ac regulator can be used for static on load tap changing of transformer.

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: B
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