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第一章 单元测试
1、单选题：
Which of the following is not a commonly used semiconductor material’? （ ）
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（ ） .
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 （ ） .
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 （ ）.
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 （ ）.
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? （ ）.
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 （ ）.
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? （ ）.
A:Clipper
B
amper
C:Voltage multiplier
D:Voltage divider
答案: Clipper
4、单选题：
The circuit shown here is a （ ）. 
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 （ ）.
A:
B:
is less than the specified 
C:the applied voltage is greater than 
D:All of these
答案: All of these
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