Electronics and Communication Engineering - Power Electronics

6. 

A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains

A. 3 full waves of input
B. 3 half waves of input
C. 6 full waves of input
D. 6 half waves of input

Answer: Option B

Explanation:

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7. 

A half bridge inverter

A. needs a 3 wire dc supply
B. may use a two wire or 3 wire dc supply
C. has higher output voltage if fed from 3 wire dc supply
D. has higher efficiency if fed from 3 wire dc supply

Answer: Option A

Explanation:

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8. 

A 3 phase series inverter has

A. 12 thyristors
B. 6 thyristors
C. 3 thyristors
D. 3 or 6 thyristors

Answer: Option B

Explanation:

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9. 

In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be

A. 5 A
B. 10 A
C. 15 A
D. 20 A

Answer: Option C

Explanation:

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10. 

HVDC systems are preferable for only long distances.

A. True
B. False

Answer: Option A

Explanation:

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