Exercise: Power Electronics

Questions for: Power Electronics

In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be
A:
less than mechanical or thermal time constant of the system
B:
more than the mechanical or thermal time constant of the system
C:
more or less than the mechanical or thermal time constant
D:
very high
Answer: A
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Which of the following devices exhibit negative resistance characteristics?
A:
UJT
B:
PUT
C:
Both UJT and PUT
D:
UJT, PUT and SBS
Answer: C
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A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then
A:
Pdc = Pac for all values of firing angles
B:
Pdc = Pac if firing angle is less than 180°
C:
Pdc < Pac for all values of firing angles
D:
Pdc < Pac if firing angle is less than 180°
Answer: D
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If 4 quadrant operation is required we need
A:
dual converter
B:
full converter
C:
semi converter
D:
none of the above
Answer: A
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Thyristors connected in series need :
A:
static equalizing circuit
B:
dynamic equalizing circuit
C:
both static and dynamic equalizing circuits
D:
none of the above
Answer: C
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