Discussion
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- Question
The circuit in figure is for
Options- A. resonant commutation
- B. line commutation
- C. auxiliary commutation
- D. complementary commutation
- Correct Answer
- complementary commutation
- 1. If the frequency is less than the damped frequency in a series- inverter
Options- A. the distortion of output voltage waveform is low
- B. the distortion of output voltage waveform is high
- C. the distortion of output voltage may be high or low depending on the load impedance
- D. none of the above Discuss
- 2. In a series inverter
Options- A. the commutating elements L and C are in parallel
- B. the commutating elements L and C are in series with load
- C. the commutating L and C may be in series or parallel with the load
- D. none of the above Discuss
- 3. Which inverter circuit uses coupled inductors?
Options- A. Modified McMurray full bridge inverter
- B. McMurray Bedford half bridge inverter
- C. Modified McMurray Bedford half bridge inverter
- D. Both (b) and (c) Discuss
- 4. In a 3 phase full converter, the instantaneous output voltage can have negative part if
Options- A. firing angle is less than 60°
- B. firing angle is less than 90°
- C. firing angle is more than 60°
- D. firing angle is more than 90° Discuss
- 5. The symbol in figure is for
Options- A. SUS
- B. SBS
- C. Shockley diode
- D. UJT Discuss
- 6. A 3 phase dual converter consists of
Options- A. two 3 phase semiconverters connected in parallel
- B. two 3 phase semiconverters connected in antiparallel
- C. two 3 phase full converters connected in antiparallel
- D. two 3 phase full converters connected in parallel Discuss
- 7. Surge current rating of an SCR is
Options- A. the maximum repetitive surge current in which the SCR can withstand
- B. the maximum non-repetitive surge current in which the SCR can withstand
- C. the maximum repetitive or non repetitive surge current in which the SCR can withstand
- D. the maximum surge current in which the SCR can withstand if both surge current and steady current exist together Discuss
- 8. A surge voltage
Options- A. has very high magnitude and very long duration
- B. has very high magnitude and very small duration
- C. has very high magnitude and very small duration and can be positive or negative
- D. can be only positive Discuss
- 9. The total number of leads in SUS, SBS and SCS respectively are
Options- A. 3, 3, 4,
- B. 3, 3, 3
- C. 2, 3, 3
- D. 3, 3, 5 Discuss
- 10. A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains
Options- A. 3 full waves of input
- B. 3 half waves of input
- C. 6 full waves of input
- D. 6 half waves of input Discuss
Power Electronics problems
Search Results
Correct Answer: the distortion of output voltage waveform is high
Correct Answer: the commutating elements L and C are in series with load
Correct Answer: Both (b) and (c)
Correct Answer: firing angle is more than 60°
Correct Answer: Shockley diode
Correct Answer: two 3 phase full converters connected in antiparallel
Correct Answer: the maximum non-repetitive surge current in which the SCR can withstand
Correct Answer: has very high magnitude and very small duration and can be positive or negative
Correct Answer: 3, 3, 4,
Correct Answer: 3 half waves of input
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