2020 Analog Electronics Technique(Huazhong University of Science and Technology)1458668455 最新满分章节测试答案

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本课程起止时间为:2020-05-11到2020-09-20
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Lecture 1 The Bipolar Junction Transistor Test questions for the bipolar junction transistor

1、 问题:When a BJT transistor is used as an amplifying device, the base-emitter junction is (     ) biased, and the base-collector junction is (    ) biased.
选项：
A:Forward，forward
B:Reverse,  reverse
C:Forward, reverse
D:Reverse, forward
答案: 【Forward, reverse】

2、 问题:For the impurity doping concentrations in the three regions of the BJT, which region is the highest (    )
选项：
A:base
B:emitter
C:collect‍or
D:unidentified
答案: 【emitter】

3、 问题:When a BJT transistor worked in saturation region, the base-emitter junction is (     ) biased, and the base-collector junction is (    ) biased.
选项：
A:Forward，forward
B:Reverse,  reverse
C:Forward, reverse
D:Reverse, forward
答案: 【Forward，forward】

4、 问题:When a BJT transistor worked in cutoff region, the base-emitter junction is (     ) biased, and the base-collector junction is (    ) biased.
选项：
A:Forward，forward
B:Reverse, reverse‍
C:Forward, reverse
D:Reverse, forward
答案: 【Reverse, reverse‍】

5、 问题:For the impurity doping concentrations in the three regions of the BJT, which region is the lowest (    )
选项：
A:base
B:emitter‍
C:collector‍
D:unidentified
答案: 【base】

6、 问题:‍A transistor is biased in the forward-active mode, the current of the three terminals are  I1= –1.2mA, I2= –0.03mA, I3= 1.23mA，which of these is the emitter terminal (    )
选项：
A:1
B:2
C:3
D:unidentified
答案: 【3】

7、 问题:A transistor is biased in the forward-active mode, the current of the three terminals are  I1= –1.2mA, I2= –0.03mA, I3= 1.23mA，which of these is the base terminal (    )
选项：
A:1
B:2
C:3
D:unidentified
答案: 【2】

8、 问题:A transistor is biased in the forward-active mode, the current of the three terminals are  I1= –1.2mA, I2= –0.03mA, I3= 1.23mA，the current gain β is (    )‍
选项：
A:30
B:40
C:41
D:1.23
答案: 【40】

9、 问题:In a BJT circuit, the transistor are made of silicon, and the voltage values for three terminals are given, which BJT operates in forward-active mode (    )
选项：
A:VC=6V ,VB=0.7V, VE=0V
B:VC=6V , VB=6V , VE=5.4V
C:VC=6V ,VB=4V ,VE=3.6V
D:VC=3.6V ,VB=4V ,VE=3.4V
答案: 【VC=6V ,VB=0.7V, VE=0V】

10、 问题:In a BJT circuit, the transistor are made of silicon, and the voltage values for three terminals are given, which BJT operates in cutoff region (    )
选项：
A:VC=6V ,VB=0.7V, VE=0V
B:VC=6V , VB=6V , VE=5.4V
C:VC=6V ,VB=4V ,VE=3.6V
D:VC=3.6V ,VB=4V ,VE=3.4V
答案: 【VC=6V ,VB=4V ,VE=3.6V】

11、 问题:In the amplification circuit, the BJT is worked in forward-active region, and the voltage of each terminals is V1=2V, V2=6V and V3=2.7V, for the three terminals, which is the emitter (      ), the type of this transistor is (     ).
选项：
A:3, NPN
B:2, PNP
C:1,NPN
D:1, PNP‍
答案: 【1,NPN】

12、 问题:For the circuit shown in Figure 13, which region does the transistor work in (    )‍
选项：
A:Forward-active region
B: Saturation region
C:Cutoff region
D:unidentified
答案: 【 Saturation region】

13、 问题:    For the circuit shown in Figure, which region does the transistor work in (    )
选项：
A:Forward-active region
B:Saturation region
C:Cutoff region
D:unidentified
答案: 【Forward-active region】

14、 问题:For the circuit shown in Figure , if the input signal is a good sinusoidal signal, but the output waveform is in the Figure 16, so this is which distortion (   )
选项：
A:Saturation and Cutoff  distortion
B:Saturation distortion‍
C:Cutoff distortion
D:unidentified
答案: 【Saturation distortion‍】

15、 问题:    For the circuit shown in Figure, which region does the transistor work in (    )
选项：
A:Forward-active region
B:Saturation region
C:Cutoff region
D:unidentified
答案: 【Forward-active region】

16、 问题:In a BJT circuit, the transistor are made of silicon, and the voltage values for three terminals are given, which BJT operates in saturation region (    )‍
选项：
A:VC=6V ,VB=0.7V, VE=0V
B:VC=6V , VB=6V , VE=5.4V‍
C:VC=6V ,VB=4V ,VE=3.6V
D:VC=3.6V ,VB=4V ,VE=3.4V
答案: 【VC=6V , VB=6V , VE=5.4V‍;
VC=3.6V ,VB=4V ,VE=3.4V】

17、 问题:For the circuit shown in Figure , if the input signal is a good sinusoidal signal, but the output waveform is in the Figure, so what measures can be taken to eliminate such distortion (   )
选项：
A:increase VCC amplitude
B:reduce the amplitude of signal source
C:reduce the value of load resistance RL
D:open the load
答案: 【increase VCC amplitude;
reduce the amplitude of signal source;
reduce the value of load resistance RL】

Lecture 2 Basic BJT amplifiers (1) Test questions for basic BJT amplifiers (1)

1、 问题:  For the circuit shown in Figure, determine the small signal hybrid-π resistance  rπ  is (    )‍ 
选项：
A:1.3k ohm
B:2.6k ohm
C:1.3 ohm
D:2.6 ohm
答案: 【2.6k ohm】

2、 问题:  For all of the circuits shown in Figure, which circuit can amplify AC small signal (    )
选项：
A:a
B:b
C:c
D:d
答案: 【b】

3、 问题:For the circuit shown in Figure, which position is the switch in A, B, C? the transistor can work in the forward active region (    )
选项：
A:A
B:B
C:C
D:Unable to determine
答案: 【B】

4、 问题:    For the circuit shown in Figure, if the transistor works in the forward active region, which output waveform is correct (   )
选项：
A:
B:
C:
D:
答案: 【】

5、 问题:For the circuit shown in Figure, if the transistor works in the forward active region, which output waveform is correct (    )
选项：
A:
B:
C:
D:
答案: 【】

6、 问题:For the circuit shown in Figure, if the DC voltage  VCE≈VCC, what