Electronics and Communication Engineering - Power Electronics

16. 

In a 3 phase bridge inverter with 180° mode of operation the numbers of thyristors conducting at one time are

A. 1
B. 2
C. 3
D. 4

Answer: Option C

Explanation:

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17. 

A single phase full converter can operate in

A. 4 quadrants
B. 3 quadrants
C. 2 quadrants
D. 1 quadrant

Answer: Option C

Explanation:

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18. 

In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle

A. is zero
B. is 60°
C. is more than 60°
D. is more than 90°

Answer: Option C

Explanation:

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19. 

In the circuit of figure, the load current when thyristor is off

A. is constant
B. increases exponentially
C. decreases exponentially
D. zero

Answer: Option C

Explanation:

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20. 

A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is

A. 15 V
B. 152 V
C. 30 V
D. 302 V

Answer: Option C

Explanation:

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