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 (    ).image.png
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
B:Damper
C:Voltage multiplier
D:Voltage divider
答案: 【Clipper

4、单选题:
The circuit shown here is a (    ). image.png
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:image.png
B:image.png is less than the specified image.png
C:the applied voltage is greater than image.png
D:All of these
答案: 【All of these

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