Exercise: Power Electronics

Questions for: Power Electronics

A semi converter operates in two quadrants.
A:
True
B:
False
C:
D:
Answer: B

It operates only in quadrant.

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If Vdc1 is the dc output voltage in half wave controlled rectifier circuit feeding resistive load and Vdc2 is the dc output voltage in full wave controlled rectifier circuit (M - 2 connection) feeding resistive load, then
A:
Vdc1 = 0.5 Vdc2 for all values of firing angle
B:
Vdc1 = Vdc2 for all values of firing angle
C:
Vdc1 â‰Ī 0.5 Vdc2 for all values of firing angle
D:
Vdc1 â‰Ĩ 0.5 Vdc2 for all values of firing angle
Answer: A

and Vdc = (1 + cos a).

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Assertion (A): A TRIAC is a bidirectional SCR.

Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.

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

Since a TRIAC can conduct in both directions it is bi directional SCR.

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The total number of leads in reverse conducting thyristor is
A:
2
B:
3
C:
1
D:
4
Answer: B

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A thyristor has a turn on time of 6 Ξs. If the anode circuit is inductive, the turn on time will be
A:
6 Ξs
B:
less than 6Ξs
C:
more than 6 Ξs
D:
either 6 Ξs or less
Answer: C

Inductive load increases the turn on time.

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