2021大学慕课答案 通信电路与系统(杭州电子科技大学)1463243443 最新大学MOOC满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-03-01到2021-06-25
本篇答案更新状态:已完结

Chapter1 Introduction to Basic Knowledge of Communication Electronics Circuits 3月10日课前练习

1、 问题:What is the core of the transmitter？
选项：
A:Mixer
B:Modulator
C:Oscillator
D:Amplifier
答案: 【Modulator】

2、 问题:Which of the following circuits is not part of super heterodyne receiver?
选项：
A:Local oscillator
B:Mixer
C:Intermediate frequency amplifier
D:Modulator
答案: 【Modulator】

3、 问题:FM radio signal belongs to which wave type?
选项：
A:VLF
B:VHF
C:UHF
D:HF
答案: 【VHF】

4、 问题:When the resistive load increases, the selectivity of LC parallel resonant circuit will be improved, but（ ）will be decreased.
选项：
A:Quality factor Q
B:Resonant frequency f0
C:Rectangular coefficient K0.1
D:Pass band B0.7
答案: 【Pass band B0.7】

5、 问题:In the wireless communication system , the transmitter and receiver are both have oscillator circuits.
选项：
A:正确
B:错误
答案: 【正确】

6、 问题:The frequency of High frequency signal only from 3- 30MHz？
选项：
A:正确
B:错误
答案: 【错误】

7、 问题:The resonant frequency will be changed by adjusting the value of L and C.
选项：
A:正确
B:错误
答案: 【正确】

8、 问题:Quality factor Q reflects the frequency-selective characteristic of the circuit, which is also related with the bandwidth.
选项：
A:正确
B:错误
答案: 【正确】

9、 问题:When the operating frequency is greater than the resonant frequency, the LC parallel resonant circuit and the LC series resonant circuit are both capacitive.
选项：
A:正确
B:错误
答案: 【错误】

10、 问题:LC series resonant circuit and LC parallel resonant circuit both have frequency-selective function.
选项：
A:正确
B:错误
答案: 【正确】

11、 问题:When the operating frequency of LC parallel reasonant circuit is lower than the reasonance frequency, the whole circuit is inductive
选项：
A:正确
B:错误
答案: 【正确】

12、 问题:The larger the rectangular coefficient, the better the frequency-selective performance.
选项：
A:正确
B:错误
答案: 【错误】

13、 问题:Load and source resistor will affect the frequency-selective characteristic of the circuit.
选项：
A:正确
B:错误
答案: 【正确】

【作业】Chapter1 Introduction to Basic Knowledge of Communication Electronics Circuits 3月10日Q&A

1、 问题:Q&A
评分规则: 【
】

【作业】Chapter1 Introduction to Basic Knowledge of Communication Electronics Circuits 3月17日Q&A

1、 问题:Q&A
评分规则: 【 根据提问与本次学习内容相关度评分
】

Chapter1 Introduction to Basic Knowledge of Communication Electronics Circuits 3月17日课前练习

1、 问题:Can both the signal source and the load be partially access to the LC circuit?
选项：
A:Yes.
B:No.
C:Only the load can.
D:Only the signal source can.
答案: 【Yes.】

2、 问题:Which of the following impedance conversion circuits can both increase and decrease the load?
选项：
A:Auto-transformer
B:Transformer
C:Capacitor divider
D:All of above
答案: 【All of above】

3、 问题:What will happen when the load is connected directly to the LC parallel resonant loop?
选项：
A:Impedance unmatched
B:Lower transmission power
C:Lower transmitting efficiency
D:Lower transmitting sensitivity
答案: 【Impedance unmatched;
Lower transmission power;
Lower transmitting efficiency;
Lower transmitting sensitivity】

4、 问题:Why the LC impedance transformation network will be used in the circuit?
选项：
A:Reduce the influence on quality factor Q
B:Improving the selectivity
C:Increase operation frequency
D:Simplify circuit structure
答案: 【Reduce the influence on quality factor Q;
Improving the selectivity】

5、 问题:Typically, the Q value is negatively associated with the access factor.
选项：
A:正确
B:错误
答案: 【错误】

6、 问题:By using impedance conversion networks, the operation frequency of LC reasonace circuits will not change.
选项：
A:正确
B:错误
答案: 【错误】

Chapter2 Radio Frequency Amplifiers 3月24日课前练习

1、 问题:In the communication circuit system, which one is not a nonlinear circuit ?
选项：
A:high frequency small signal amplifier
B:mixer
C:oscillator
D:detector
答案: 【high frequency small signal amplifier】

2、 问题:What is the power amplifier generally classified according to?
选项：
A:Amplitude of the input signal
B:Conduction angle
C:Magnification
D:Output power
答案: 【Conduction angle】

3、 问题:What status dose Class C amplifier work at?
选项：
A:On-off
B:current source
C:linear
D:Amplification
答案: 【On-off】

4、 问题:What’s the bias point of the C class power amplifiers?
选项：
A:Above the pinch-off
B:On the pinch-off
C:Below the pinch-off
D:Equal to working power
答案: 【Below the pinch-off】

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