第一章 单元测试

1、单选题：
Which of the following is not a commonly used semiconductor material'? （ ）
选项：
A:carbon
B:lead
C:silicon
D:germanium
答案: 【lead】

2、单选题：
The characteristic of an ideal diode are those of a switch that can conduct current（ ）.
选项：
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
答案: 【in one direction only】

3、单选题：
When a diode is doped with either a pentavalent or a trivalent impurity its resistance will （ ）.

选项：
A:increase
B:decrease
C:make the resistance stable against variation due to temperature
答案: 【decrease】

4、单选题：
The piecewise linear model, equivalent circuit of the diode consists of （ ）.
选项：
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
答案: 【a battery, a small resistor, and the ideal diode】

5、单选题：
When a p-n junction is reverse-biased, its junction resistance is（ ）.
选项：
A:high
B:low
C:determined by the components that are external to the device
D:constantly changing
答案: 【high】

第二章 单元测试
1、单选题：
What is the value of the voltage dropped across forward-biased silicon diodes that are connected in parallel with each other? （ ）.
选项：
A:11.3 V
B:0.35 V
C:0.7 V
D:1.4 V
答案: 【0.7 V】

2、单选题：
The resistor voltage and resistor current in this circuit are （ ）.
选项：
A:10 V, 5 mA
B:11 V, 2 mA
C:11 V, 11 mA
D:2 V, 11 mA
答案: 【11 V, 11 mA】

3、单选题：
Which of the following circuits is used to eliminate a portion of a signal? （ ）.
选项：
A:Clipper
Bamper
C:Voltage multiplier
D:Voltage divider
答案: 【Clipper】

4、单选题：
The circuit shown here is a （ ）.
选项：
A:series clipper
B:parallel clipper
C:series clamper
D:shunt clamper
答案: 【parallel clipper】

5、单选题：
The Zener diode must be operated such that （ ）.
选项：
A:
B:is less than the specified
C:the applied voltage is greater than
D:All of these
答案: 【All of these】