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高中 解答
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8 dB
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四個完全相同規格的喇叭同時發出聲響時,其音量會比單獨一個喇叭發出聲響時,高出約多少分貝 dB?(計算時可參考底下的對數表) log2 log3 log4 log5 log6 log8 log9 log10 0.301 0.477 0.602 0.699 0.778 0.903 0.954 1
100 dB
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如圖(十)所示為變壓器耦合串級放大電路,假設 A = 100 、 A = 26 dB 、 A = 40 ,試求此電路之總 電壓增益為何? V1 V2 V3
提高功率轉移效率是變壓器耦合放大器的優點之一
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有關放大器特性之敘述,下列何者錯誤?
100
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如圖(九)所示之電路,假設電晶體 β = 99 , V = 0.7 V , 熱電壓 V 為 26 mV,試求將電晶體用小信號模型代入後之 BE T 交流電流增益 II 約為多少? o i
2000 Ω
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如圖(八)所示之電路,假設電晶體 β = 90 ,熱電壓 V 為 26 mV, V = 0.7 V ,試求輸入阻抗 Z 約為多少? T BE i
49
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如圖(七)所示之電路,假設電晶體之 β = 49 ,射極交流 電阻 r = 8 Ω ,試求電壓增益 VV 約為何? e o i
333 kΩ
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如圖(六)所示之電路,假設電晶體 β = 100 , V = 0.7 V , V = 8 V ,試求 電阻 R 約為何? BE
34.7 μA
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如圖(五)所示之電路,假設電晶體工作於主動區, β = 80 且 V = 0.7 V ,試求 基極電流 I 約為多少? BE
0.5
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處於主動區的電晶體,假設集極電流為 14.7 mA,基極電流為 0.3 mA。請問共基極組態電流放大因數 α 為何?
NPN 型電晶體集極的摻雜濃度最低
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有關雙極性電晶體 BJT 特性之敘述,下列何者錯誤?
17 V
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如圖(四)所示之電路,已知 V (t) = 220sin 377t V ,假設 L 與 L 的匝數相同,且 D 、 D 為理想二極體,試求 V 之平均電壓約 i 1 2 為多少? 1 2 o
7 V 圖(三)
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如圖(三)所示之電路,若 V (t) = 2 + 10sin 377t V ,且 D 為理想二 極體,試求 V 的中心電壓為何? i o
二極體 D 的最大逆向偏壓為 60 V out
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如圖(二)所示之電路,若 V 為 120sin 377t V ,且 D 、 D 為理 想二極體,試問下列敘述,何者正確? in 1 2
溫度越低,稽納式崩潰 Zener breakdown 之崩潰電壓越小
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有關二極體特性的敘述,下列何者正確?
lobby
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Which of the following words is closest in meaning to the word “range” in the last paragraph?
These ugly works reflect this ugly world.
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According to the passage, why are so many “ugly” works of art on display?
It shows different ways to take in beauty in art.
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What’s this passage mainly about?
On a mountain.
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Where is Ani located?
Under the rule of the Turkish Republic.
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When did Ani become a regional power?
Turn worse.
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What does the word “deteriorate” in the first paragraph probably mean?
The war between Turkey and Armenia.
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What’s the passage mainly about?
Fiona: You look so pale! What happened? Irene: Did you hear the rumor about me? Andy said that I’m dating different boys at the same time. Fiona: Is he spreading it in school? Irene: I have no idea. I’m just worried how I’m going to face all my friends in school.
Amy: This morning, when I was withdrawing money in the bank, I saw a woman rushing in, wanting to take out all the money in her account. Tony: Was she being cheated? Amy: That’s right! She said someone called, saying that he had kidnapped her son. And she did hear a boy crying out loud on the other side of the phone. Tony: I believe the clerk in the bank asked her to go to the nursery to have a check first. Amy: You’re smart! That’s exactly what the woman was told to do.
Annie: What’s the matter with your sweater? It looks small on you. Jerry: I washed it in a washing machine, and it turned out like this. Annie: Didn’t you check the laundry symbol attached to the sweater? If the sweater is made of pure wool, you need to dry clean it. Jerry: Woops, ! The clerk warned me about that, and I just forgot it completely.