# Electronics and Communication Engineering - Power Electronics

### Exercise :: Power Electronics - Section 5

31.

If the frequency is less than the damped frequency in a series- inverter

 A. the distortion of output voltage waveform is low B. the distortion of output voltage waveform is high C. the distortion of output voltage may be high or low depending on the load impedance D. none of the above

Explanation:

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32.

The output frequency of a cycloconverter can be changed by changing the firing angle.

 A. True B. False

Explanation:

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33.

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

Explanation:

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34.

Assertion (A): A DIAC has four layers but only two terminals.

Reason (R): A DIAC 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

Explanation:

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35.

In a 3 phase full converter, the instantaneous output voltage can have negative part if

 A. firing angle is less than 60° B. firing angle is less than 90° C. firing angle is more than 60° D. firing angle is more than 90°