Exercise: Power Electronics

Questions for: Power Electronics

Assertion (A): A GTO circuit is more compact than SCR circuit

Reason (R): A GTO can be turned off by negative gate pulse.

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 commutation circuit is not required, GTO circuit is compact.

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In the below figure the rms voltage across each half of secondary is 200 V. The peak inverse voltage across each of thyristor is
A:
200 V
B:
2(200) V
C:
2(400) V
D:
800 V
Answer: C

PIV = 2(2 x 200).

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Assertion (A): A cycloconverter may be line commutated or forced commutated

Reason (R): A step up cycloconverter requires forced commutation.

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
No answer description is available. Let's discuss.
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On load tap changer using thyristors can have a maximum of two taps.
A:
True
B:
False
C:
D:
Answer: B

Any number of taps are possible.

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In dielectric heating, the thyristor circuits consist of
A:
rectifier-chopper combination
B:
controlled rectifier
C:
ac regulator
D:
rectifier-inverter combination
Answer: D

Input ac is rectified and then converted to high frequency ac.

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