Discussion
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- Question
In a single phase full wave converter (M-2 connection) feeding on R-L load the input voltage is v = Vm sin ?t. The expression for rms output voltage is
Options- A.
- B.
- C.
- D.
- Correct Answer
-
- 1. When a power diode is conducting, the voltage drop across it is about
Options- A. I V
- B. 5 V
- C. 20 V
- D. 50 V Discuss
- 2. In a parallel inverter
Options- A. each thyristor is turned on twice during each cycle
- B. each thyristor is turned on once during each cycle
- C. each thyristor is turned on either once or twice in each load cycle
- D. each thyristor may be turned on upto four times in each load cycle Discuss
- 3. The minimum gate current which can turn on SCR is called :
Options- A. trigger current
- B. holding current
- C. junction current
- D. breakover current Discuss
- 4. The output frequency of a cycloconverter can be changed by changing the firing angle.
Options- A. True
- B. False Discuss
- 5. In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 6. In thermal ohm's law, temperature and power loss are analogous to
Options- A. V and I respectively of ohm's law
- B. I and V respectively of ohm's law
- C. R and V respectively of ohm's law
- D. I and R respectively of ohm's law Discuss
- 7. The symbol in figure is for
Options- A. SUS
- B. SBS
- C. Shockley diode
- D. UJT Discuss
- 8. 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
- 9. 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
- 10. 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
Power Electronics problems
Search Results
Correct Answer: I V
Correct Answer: each thyristor is turned on twice during each cycle
Correct Answer: trigger current
Correct Answer: False
Correct Answer: 2
Correct Answer: I and V respectively of ohm's law
Correct Answer: Shockley diode
Correct Answer: firing angle is more than 60°
Correct Answer: Both (b) and (c)
Correct Answer: the commutating elements L and C are in series with load
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