A cycloconverter uses natural commutation forced commutation either natural or f

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Question
A cycloconverter uses
Options
A. natural commutation
B. forced commutation
C. either natural or forced commutation
D. both natural and forced commutation together

Correct Answer

either natural or forced commutation

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3. In a certain inverter circuit each thyristor carries 26.67 A for 60�, 13.33 A for 120� and zero A for 180� of the cycle. The rms current of thyristor is
Options
A. 20 A
B. 13.33 A
C. 6.67 A
D. 3.33 A

7. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency
Options
A. must be a sub-multiple of input frequency
B. can be any frequency
C. must be an even sub-multiple of input frequency
D. must be an odd sub-multiple of input frequency

8. Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode
Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel
Options
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

9. Which statement is correct?
Options
A. BJT and MOSFET are current controlled devices
B. BJT is voltage controlled and MOSFET is current controlled device
C. BJT and MOSFET are voltage controlled devices
D. BJT is current controlled and MOSFET is voltage controlled device

10. A class E chopper
Options
A. can operate in second quadrant only
B. can operate in first or third quadrant
C. can operate in all the four quadrants
D. can operate in either second or third quadrant

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