西安邮电大学
第一章测试
1.Which of the following is not a commonly used semiconductor material'? （ ）
答案:
lead
2.The characteristic of an ideal diode are those of a switch that can conduct current（ ） .
答案:
in one direction only
in one direction only
3.When a diode is doped with either a pentavalent or a trivalent impurity its resistance will （ ） .
答案:
decrease
4.The piecewise linear model, equivalent circuit of the diode consists of （ ）.
答案:
a battery, a small resistor, and the ideal diode
西安邮电大学5.When a p-n junction is reverse-biased, its junction resistance is （ ）.
答案:
high
第二章测试
6.What is the value of the voltage dropped across forward-biased silicon diodes that are connected in parallel with each other? （ ）.
答案:
0.7 V
7.The resistor voltage and resistor current in this circuit are （ ）.
答案:
11 V, 11 mA
11 V, 11 mA
8.Which of the following circuits is used to eliminate a portion of a signal? （ ）.
答案:
Clipper
9.The circuit shown here is a （ ）.
答案:
parallel clipper
10.The Zener diode must be operated such that （ ）.
答案:
All of these
第三章测试
11.In the active region, the base-emitter junction （ ）.
答案:
is forward-biased while the base-collector junction is reversed-biased
12.A BJT has measured dc current values of = 0.1 mA and = 8.0 mA. When IB is varied by 100 μA, IC changes by 10 mA. What is the value of the βac for this device?（ ）.
答案:
100
13.When a BJT is operating in the active region, the voltage drop from the base to the emitter is approximately equal to the （ ）。
答案:
diode drop (about 0.7 V)
14.BJTs are commonly used as （ ）.
答案:
the primary components in amplifiers
15.The condition where increase in bias current will not cause further increases in collector current is called （ ）.
发布评论