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Power Electronics
Comments
Question
Half bridge and full bridge inverters of one type use different commutation methods.
Options
A. True
B. False
Correct Answer
False
Power Electronics problems
Search Results
1. In rectifier circuits, the rms value of ac component of output voltage is equal to
Options
A. V
rms
B. 0.5 V
rms
C. (V
rms
- V
dc
)
0.5
D. (V
rms
2
- V
dc
2
)
0.5
Show Answer
Scratch Pad
Discuss
Correct Answer: (V
rms
2
- V
dc
2
)
0.5
2. If 0.5 T is the time period of oscillations and T
off
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.
Show Answer
Scratch Pad
Discuss
Correct Answer:
3. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 8 thyristors and 4 diodes
4. Which of these devices can conduct in both directions?
Options
A. SCR
B. SUS
C. SBS
D. UJT
Show Answer
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Discuss
Correct Answer: SBS
5. The efficiency of a chopper circuit is about
Options
A. 80% or more
B. around 50%
C. around 20%
D. around 5%
Show Answer
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Discuss
Correct Answer: 80% or more
6. 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
Show Answer
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Discuss
Correct Answer: 12
7. 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
Show Answer
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Discuss
Correct Answer: may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
8. In rectifier circuits, ripple factor RF and form factor FF are related as
Options
A. RF = (FF
2
- 1)
0.5
B. RF = FF
C. RF = FF - 1
D. RF = (FF - 1)
0.5
Show Answer
Scratch Pad
Discuss
Correct Answer: RF = (FF
2
- 1)
0.5
9. A chopper is a high efficiency circuit.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
10. 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.
Show Answer
Scratch Pad
Discuss
Correct Answer:
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