概冠介胶杜祈鲜够炉腻邓揉奥
Chapter1 Introduction to Basic Knowledge of Communication Electronics Circuits 3月10日课前练习
1、 What is the core of the transmitter？
答案: Modulator
2、 Which of the following circuits is not part of super heterodyne receiver
答案: Modulator
3、 FM radio signal belongs to which wave type
答案: VHF
4、 When the resistive load increases, the selectivity of LC parallel resonant circuit will be improved, but（ ）will be decreased.
答案: Pass band B0.7
5、 In the wireless communication system , the transmitter and receiver are both have oscillator circuits.
答案: 正确
6、 The frequency of High frequency signal only from 3- 30MHz？
答案: 错误
7、 The resonant frequency will be changed by adjusting the value of L and C.
答案: 正确
8、 Quality factor Q reflects the frequency-selective characteristic of the circuit, which is also related with the bandwidth.
答案: 正确
9、 When the operating frequency is greater than the resonant frequency, the LC parallel resonant circuit and the LC series resonant circuit are both capacitive.
答案: 错误
10、 LC series resonant circuit and LC parallel resonant circuit both have frequency-selective function.
答案: 正确
11、 When the operating frequency of LC parallel reasonant circuit is lower than the reasonance frequency, the whole circuit is inductive
答案: 正确
12、 The larger the rectangular coefficient, the better the frequency-selective performance.
答案: 错误
13、 Load and source resistor will affect the frequency-selective characteristic of the circuit.
答案: 正确
Chapter1 Introduction to Basic Knowledge of Communication Electronics Circuits 3月17日课前练习
1、 Can both the signal source and the load be partially access to the LC circuit
答案: Yes.
2、 Which of the following impedance conversion circuits can both increase and decrease the load
答案: All of above
3、 What will happen when the load is connected directly to the LC parallel resonant loop
答案: Impedance unmatched;
Lower transmission power;
Lower transmitting efficiency;
Lower transmitting sensitivity
4、 Why the LC impedance transformation network will be used in the circuit
答案: Reduce the influence on quality factor Q;
Improving the selectivity
5、 Typically, the Q value is negatively associated with the access factor.
答案: 错误
6、 By using impedance conversion networks, the operation frequency of LC reasonace circuits will not change.
答案: 错误
Chapter2 Radio Frequency Amplifiers 3月24日课前练习
1、 In the communication circuit system, which one is not a nonlinear circuit
答案: high frequency small signal amplifier
2、 What is the power amplifier generally classified according to
答案: Conduction angle
3、 What status dose Class C amplifier work at
答案: On-off
4、 What’s the bias point of the C class power amplifiers
答案: Below the pinch-off
5、 If the input signal of the C class power amplifier is a sinusoidal signal, the collector current is :
答案: periodic cosine pulses
6、 The higher the conduction angle, the higher the efficiency.
答案: 错误
Chapter2 Radio Frequency Amplifiers 3月31日课前练习
1、 Class C PA can realize
答案: All the above
2、 The collector current of the class C PA is the periodic cosine pulses, but the output voltage is a sinusoidal (or cosine) signal.
答案: 正确
3、 Pout=PL.
答案: 错误
4、 The load line of class C PA is the same with the low frequency PA.
答案: 错误
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