Electronics and Communication Engineering - Power Electronics

6. 

Which converter is used in HVDC transmission?

A. 3 pulse
B. 6 pulse
C. 12 pulse
D. 24 pulse

Answer: Option C

Explanation:

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7. 

Assertion (A): The turn on time of SCR is about 1 to 4 ms.

Reason (R): The turn off time of SCR is about 10 to 300 ms.

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: Option B

Explanation:

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8. 

An n pulse rectifier is fed by a source having an inductance L. If load current is I0, the voltage drop due to overlap is

A.
B.
C.
D.

Answer: Option A

Explanation:

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9. 

Which chopper circuit operates in all the 4 quadrants?

A. A
B. C
C. D
D. E

Answer: Option D

Explanation:

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10. 

A single phase cycloconverter feeds a resistance heating load. The heating power is provided by

A. only the fundamental component of output wave
B. only higher harmonics in the output wave
C. both fundamental and higher harmonics in the output wave
D. either (a) or (b)

Answer: Option C

Explanation:

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