Discussion
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- Question
If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. Mc Murray full bridge inverter uses
Options- A. 4 thyristors and 2 diodes
- B. 4 thyristors and 4 diodes
- C. 8 thyristors and 4 diodes
- D. 8 thyristors and 8 diodes Discuss
- 2. Which of these devices can conduct in both directions?
Options- A. SCR
- B. SUS
- C. SBS
- D. UJT Discuss
- 3. The efficiency of a chopper circuit is about
Options- A. 80% or more
- B. around 50%
- C. around 20%
- D. around 5% Discuss
- 4. A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be
Options- A. 47°
- B. less than 47°
- C. more than 47°
- D. either more or less than 47° Discuss
- 5. Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier.
Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.
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 Discuss
- 6. In rectifier circuits, the rms value of ac component of output voltage is equal to
Options- A. Vrms
- B. 0.5 Vrms
- C. (Vrms - Vdc)0.5
- D. (Vrms2 - Vdc2)0.5 Discuss
- 7. Half bridge and full bridge inverters of one type use different commutation methods.
Options- A. True
- B. False Discuss
- 8. In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
Options- A. 36
- B. 18
- C. 12
- D. 8 Discuss
- 9. Two thyristors of the same rating and specifications
Options- A. will have equal on state voltage drops
- B. will have equal forward blocking voltage for the same current
- C. will have different on state voltage drops
- D. may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current Discuss
- 10. In rectifier circuits, ripple factor RF and form factor FF are related as
Options- A. RF = (FF2 - 1)0.5
- B. RF = FF
- C. RF = FF - 1
- D. RF = (FF - 1)0.5 Discuss
Power Electronics problems
Search Results
Correct Answer: 8 thyristors and 4 diodes
Correct Answer: SBS
Correct Answer: 80% or more
Correct Answer: more than 47°
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: (Vrms2 - Vdc2)0.5
Correct Answer: False
Correct Answer: 12
Correct Answer: may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
Correct Answer: RF = (FF2 - 1)0.5
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