西安邮电大学
第一章单元测试
Which of the following is not a commonly used semiconductor material'? （ ）
The characteristic of an ideal diode are those of a switch that can conduct current（ ） .
When a diode is doped with either a pentavalent or a trivalent impurity its resistance will （ ） .
The piecewise linear model, equivalent circuit of the diode consists of （ ）.
When a p-n junction is reverse-biased, its junction resistance is （ ）.
A:carbon B:lead C:germanium D:silicon
答案:lead
A:in both directions but in only one direction at a time B:depends on the circuit it is used in C:in both directions D:in one direction only
答案:in one direction only
A:increase B:make the resistance stable against variation due to temperature C:decrease
答案:decrease
A:a battery, a small resistor, and the ideal diode B:a battery and the ideal diode C:a junction capacitor, a battery, a small resistor, and the ideal diode D:the ideal diode
答案:a battery, a small resistor, and the ideal diode
A:determined by the components that are external to the device B:constantly changing C:low D:high
答案:high
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