Discussion
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- Question
Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fired.
Reason (R): A thyristor can conduct only when it is forward biased.
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
- Correct Answer
- A is wrong but R is correct
- 1. To turn off an SCR, it is necessary to reduce its current to less than :
Options- A. trigger current
- B. holding current
- C. breakover current
- D. none of the above Discuss
- 2. An ideal rectifier should have
Options- A. 100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor
- B. 100% efficiency, zero tipple factor, zero harmonic factor and zero displacement factor
- C. 100% efficiency, zero ripple factor, unity harmonic factor and unity displacement factor
- D. 100% efficiency, unity ripple factor, zero harmonic factor and unity displacement factor Discuss
- 3. The number of leads in a DIAC are
Options- A. 2
- B. 3
- C. 4
- D. 6 Discuss
- 4. In a modified series inverter with two inductors and two capacitors, the load current
Options- A. has 2 parallel paths
- B. has only one parallel path
- C. can have three parallel paths
- D. has four parallel paths Discuss
- 5. In a bridge inverter
Options- A. an output transformer is essential
- B. an output transformer is not essential
- C. an output transformer cannot be connected
- D. an output transformer, if used, can improve the efficiency of the circuit Discuss
- 6. The effect of source inductance in a 3 phase fully controlled bridge converter is to
Options- A. decrease the output voltage
- B. increase the output voltage
- C. decrease the output voltage and increase the output current
- D. increase the output voltage and decrease the output current Discuss
- 7. Class A and class B chopper
Options- A. operate in first quadrant
- B. operate in second quadrant
- C. class A chopper operates in first quadrant while class B operates in second quadrant
- D. may operate in either first or second quadrant Discuss
- 8. In a modified series inverter
Options- A. the maximum output frequency is less than frequency of damped oscillations
- B. the output frequency can be even higher than the frequency of damped oscillations
- C. the output frequency cannot exceed the frequency of damped oscillations
- D. any of the above Discuss
- 9. A single phase cycloconverter with centre tapped input transformer requires
Options- A. 2 thyristors
- B. 4 thyristors
- C. 8 thyristors
- D. either 2 or 4 thyristors Discuss
- 10. A class B chopper operates in third quadrant.
Options- A. True
- B. False Discuss
Power Electronics problems
Search Results
Correct Answer: holding current
Correct Answer: 100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor
Correct Answer: 2
Correct Answer: has 2 parallel paths
Correct Answer: an output transformer is not essential
Correct Answer: decrease the output voltage
Correct Answer: class A chopper operates in first quadrant while class B operates in second quadrant
Correct Answer: the output frequency can be even higher than the frequency of damped oscillations
Correct Answer: 4 thyristors
Correct Answer: False
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