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- -- card: 95570 from stack: in
- -- bmap block id: 0
- -- flags: 4000
- -- background id: 7720
- -- name: #311
- ----- HyperTalk script -----
- on openCard
- global group,rightone
- put 30 into group
- put "D" into rightone
- pass openCard
- end openCard
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- -- part contents for background part 20
- ----- text -----
- Question #30
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- -- part contents for background part 1
- ----- text -----
- 4BG-3A.3 What are the principle uses of an op-amp RC active filter in amateur circuitry?
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- -- part contents for background part 11
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- Op-amp circuits are used as high-pass filters to block RFI at the input to receivers
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- -- part contents for background part 27
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- Op-amp circuits are used as low-pass filters between transmitters and transmission lines
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- -- part contents for background part 28
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- Op-amp circuits are used as filters for smoothing power-supply output
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- -- part contents for background part 29
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- Op-amp circuits are used as audio filters for receivers
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- -- part contents for background part 43
- ----- text -----
- Correct answer is D