2021知到答案【 模擬電子技術(shù)基礎(chǔ)（西安郵電大學(xué)版）】智慧樹網(wǎng)課章節(jié)測試答案

1、第 頁2021知到答案【 模擬電子技術(shù)基礎(chǔ)（西安郵電大學(xué)版） 】智慧樹網(wǎng)課章節(jié)測試答案 第二章 章節(jié)測試】第十一章 章節(jié)測試 1、選擇題:If the input voltage is 0.25 V and the output is -2.5 V, the value ofmust be （ ）.選項(xiàng)：A:40.0 kB:20.0 kC:16.0 kD:5.0 k答案: 【20.0 k】2、選擇題:The output voltage, VO, is given by （ ）.選項(xiàng)：A:B:C:答案: 【】3、選擇題:A summing integrator is an op-amp int

2、egrator that has （ ）.選項(xiàng)：A:multiple feedback capacitorsB:multiple input resistorsC:multiple input resistors and feedback capacitors答案: 【multiple input resistors and feedback capacitors】4、選擇題:A second order low-pass filter has a high-end roll-off of （ ）.選項(xiàng)：A:60 dB/octaveB:40 dB/decadeC:20 dB/octaveD:6

3、 dB/decade答案: 【40 dB/decade】5、選擇題:An active filter that provides a constant output for input signals above is called an ideal （ ）.選項(xiàng)：A:low-pass filterB:high-pass filterC:bandpass filter答案: 【high-pass filter】第十二章 章節(jié)測試 1、選擇題:A class B amplifier (not push-pull) （ ）.選項(xiàng)：A:conducts through 360 of the inpu

4、t waveformB:conducts through 180 of the input waveformC:conducts between 180 and 360 degrees of the input waveform, depending on the amount of dc biasD:conducts through less than 180 of the input waveform答案: 【conducts through 180 of the input waveform】2、選擇題:Crossover distortion in class B amplifiers

5、 is prevented by （ ）.選項(xiàng)：A:biasing the transistors deeply into cutoffB:biasing the transistors slightly above cutoffC:using complementary-symmetry transistorsD:increasing the load resistance答案: 【biasing the transistors slightly above cutoff】3、選擇題:The maximum theoretical efficiency of an RC-coupled cl

6、ass A amplifier is （ ）.選項(xiàng)：A:25%B:50%C:78.5%D:99%答案: 【25%】4、選擇題:Power amplifiers are typically used to drive low impedance loads.（ ）選項(xiàng)：A:對(duì)B:錯(cuò)答案: 【對(duì)】5、選擇題:The power that an amplifier delivers to a load is equal to the difference between the power that the circuit draws from the power supply and the po

7、wer that the circuit dissipates.（ ）選項(xiàng)：A:對(duì)B:錯(cuò)答案: 【對(duì)】第十三章 章節(jié)測試 1、選擇題:The feedback circuit connection shown here is （ ）.選項(xiàng)：A:voltage series feedbackB:voltage shunt feedbackC:current series feedbackD:current shunt feedback答案: 【voltage series feedback】2、選擇題:Calculate the voltage gain for voltage series f

8、eedback when the amplifier gain is A = -2000 and F = -1/50. （ ）選項(xiàng)：A:-2000B:-1/50C:50D:-48.78答案: 【-48.78】3、選擇題:Calculate the input impedance for voltage series feedback when the amplifier has = 10 k, amplifier gain is A = -2000, and F= . （ ）選項(xiàng)：A:input impedance with feedback 10 kB:input impedance wit

9、h feedback 410 kC:input impedance with feedback 244 D:input impedance with feedback 50 答案: 【input impedance with feedback 410 k】4、選擇題:The output impedance of current-shunt feedback amplifier （ ）the output impedance of its op-amp.選項(xiàng)：A:is increased when compared toB:is decreased when compared toC:is reduced by half when compared toD:has no effect on答案: 【is increased when compared to】5、選擇題:An amplifier has a gain-bandwidth product of 200 MHz. A feedback network is added that has a feedback factor