2020 模拟电子技术基础(西安邮电大学)1451670462 最新满分章节测试答案

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本课程起止时间为:2020-02-25到2020-08-31
本篇答案更新状态:已完结

【作业】Chapter 1 SEMICONDUCTOR DIODES 第一章 作业

1、 问题:1. Which of the following is not a commonly used semiconductor material’? A) carbon B) lead C) silicon D) germanium 2.The characteristic of an ideal diode are those of a switch that can conduct current . A) in both directions B) in one direction only C) in both directions but in only one direction at a time D) depends on the circuit it is used in 3.When a diode is doped with either a pentavalent or a trivalent impurity its resistance will . A) increase B) decrease C) make the resistance stable against variation due to temperature D) None of the above 4.The piecewise linear model, equivalent circuit of the diode consists of . A) a junction capacitor, a battery, a small resistor, and the ideal diode B) a battery, a small resistor, and the ideal diode C) a battery and the ideal diode D) the ideal diode 5.When a p-n junction is reverse-biased, its junction resistance is _. A) high B) low C) determined by the components that are external to the device D) constantly changing
评分规则: 【 每题4分共20分
】

2、 问题:1. Describe the difference between n-type and p-type semiconductor materials.描述n型材料和批p 型材料的区别。2.Describe in your own words the conditions established by forward-and reverse-bias conditions on a p-n junction diode and how the resulting current is affected?用自己的语言描述p-n结二极管建立的正偏与反偏情况，以及产生电流是如何受影响的？3.What is the one important difference between the characteristics of simple switches and those of an ideal diode?简单开关的特性与理想二极管的特性之间的一个重要区别是什么？
评分规则: 【 每题10分共30分
】

Chapter 1 SEMICONDUCTOR DIODES 第一章测验

1、 问题:A p-n junction is forward biased when ____.
选项：
A: the applied potential causes the n-type material to be more positive than the p-type material
B: the applied potential causes the n-type material to be more negative than the p-type material
C: both materials are at the same potential
D: None of these
答案: 【 the applied potential causes the n-type material to be more negative than the p-type material 】

2、 问题:A p-n junction is reverse biased when _.
选项：
A: the applied potential causes the n-type material to be more positive than the p-type material
B: the applied potential causes the n-type material to be more negative than the p-type material
C: the current flow across the junction is based on minority carrier transfer
D: All of the above
答案: 【 the applied potential causes the n-type material to be more positive than the p-type material 】

3、 问题:The diffusion capacitance of a diode is a shunt capacitance effect that occurs when the diode ___.
选项：
A: is large
B: is small
C: is forward biased
D: is reverse biased
答案: 【 is forward biased】

4、 问题:The transition capacitance of a diode is a shunt capacitive effect that occurs when the diode _____.
选项：
A: is large
B: is small
C: is forward-biased
D: is reverse-biased
答案: 【 is reverse-biased】

5、 问题:The reverse saturation current of a diode will just about ___ for every 10°C rise in the diode temperature.
选项：
A: double
B: half
C: increase proportionately with temperature
D: decrease proportionately with temperature
答案: 【 double】

6、 问题:Increasing the temperature of a forward-biased diode ______.
选项：
A: causes forward current to increase
B: causes forward current to decrease
C: has no significant effect on the forward current
D: None of these
答案: 【 causes forward current to increase】

7、 问题:Some of the modern ohmmeters have a diode test setting. If you do not have one of these ohmmeters then to test the diode you need to check its resistance in the forward and the reverse direction. These resistances should be ____.
选项：
A: relatively high in the forward direction and relatively low in the reverse direction
B: relatively low in the forward direction and relatively low in the reverse direction
C: relatively low in the forward direction and relatively high in the reverse direction
D: relatively high in the forward direction and relatively high in the reverse direction
答案: 【 relatively low in the forward direction and relatively high in the reverse direction 】

8、 问题:In the Zener region the current __ and the voltage across the diode ____
选项：
A: is almost constant; can increase a lot
B: is almost constant; is almost constant
C: can increase a lot; is almost constant
D: can increase a lot; can increase a lot
答案: 【 can increase a lot; is almost constant】

9、 问题:The ___ diode is a short circuit for the region of conduction and it is an open circuit in the region of nonconduction.
选项：
A: ideal
B: typical
C: power
D: small-signal
答案: 【 ideal】

10、 问题:The ideal diode symbol has an arrow that points in the direction of _____.
选项：
A: the leakage current flow
B: the forward current flow
C: positive terminal under forward bias
D: All of the above
答案: 【 the forward current flow】

11、 问题:As the device temperature increases, semiconductor materials tend to have ______
选项：
A: an increasing number of free electrons
B: a decreasing number of free electrons
C: lower conduction levels
D: relatively unchanged conduction conduction levels
答案: 【 an increasing number of free electrons】

12、 问题: Doping is used to ____
选项：
A: decrease the conductivity of an intrinsic semiconductor
B: increase the conductivity of an intrinsic semiconductor
C: stabilize the conductivity of an intrinsic semiconductor
D: increase the insulative quality of an intrinsic semiconductor
答案: 【 increase the conductivity of an intrinsic semiconductor】

13、 问题:When a p-n junction’s depletion layer is narrowed and the device acts as a nearly perfect conductor, it is ______.
选项：
A: forward-biased
B: reverse-biased
C: unbiased
D: None of the above
答案: 【 forward-biased】

14、 问题:When a p-n junction is reverse-biased, the depletion layer is __ and the device acts as a near-perfect ______.
选项：
A: narrowed; conductor
B: narrowed; insulator
C: widened; conductor
D: widened; insulator
答案: 【 widened; insulator】

15、 问题:The electrode with n-type material of a diode is called the _____
选项：
A: anode
B: cathode
C: depletion region
D: Zener region
答案: 【 cathode】

16、 问题:Silicon diodes have been more significantly developed than germanium because ___
选项：
A: it is cheaper
B: it is easier to produce
C: it is more tolerant of heat
D: it has a lower forward voltage drop
答案: 【 it is cheaper】

17、 问题:Pentavalent atoms are often referred to as _____
选项：
A: donor atoms
B: minority carriers
C: acceptor atoms
D: majority carriers
答案: 【 donor atoms】

18、 问题:The electrode with p-type material of a diode is called the ____
选项：
A: anode
B: cathode
C: depletion region
D: Zener region
答案: 【 anode】

19、 问题:When tested with an ohmmeter, a diode should have a relatively high resistance for _____ condition.
选项：
A: the reverse-biased
B: the forward-biased
C: both reverse and forward-biased
D: zero-biased
答案: 【 the reverse-biased】

20、 问题:When tested with an ohmmeter, a diode should have a relatively small resistance for ____ condition
选项：
A: the reverse-biased
B: the forward-biased
C: both reverse- and forward-biased
D: zero-biased
答案: 【 the forward-biased 】

21、 问题:The act of giving off light by applying an electrical source of energy is called _____
选项：
A: light power
B: laser
C: photons
D: electroluminescence
答案: 【 electroluminescence】

22、 问题:Electrons are the minority carriers in an n-type material.
选项：
A:正确
B:错误

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