Discussion
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- Question
A chopper is a high efficiency circuit.
Options- A. True
- B. False
- Correct Answer
- True
- 1. 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
- 2. 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
- 3. 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
- 4. Half bridge and full bridge inverters of one type use different commutation methods.
Options- A. True
- B. False Discuss
- 5. 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
- 6. In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is
Options- A.
- B.
- C.
- D.
Discuss
- 7. A single phase half wave rectifier is feeding a resistive load. As firing angle is increased
Options- A. dc output voltage and rms output voltage decrease in the same proportion
- B. dc output voltage and rms output voltage decrease
- C. dc output voltage and rms output voltage increase
- D. dc output voltage and rms output voltage increase in the same proportion Discuss
- 8. Thyristors connected in series need static and dynamic stabilizing circuits.
Options- A. True
- B. False Discuss
- 9. In the basic series inverter circuit, the source current has
Options- A. low harmonic content
- B. high harmonic content
- C. low or high harmonic content depending on firing angle
- D. zero harmonic content Discuss
- 10. Assertion (A): Chopper always requires forced commutation
Reason (R): Morgan chopper uses a saturable reactor.
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
Power Electronics problems
Search Results
Correct Answer: RF = (FF2 - 1)0.5
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: 12
Correct Answer: False
Correct Answer: (Vrms2 - Vdc2)0.5
Correct Answer:
Correct Answer: dc output voltage and rms output voltage decrease
Correct Answer: True
Correct Answer: high harmonic content
Correct Answer: Both A and R correct but R is not correct explanation of A
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