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1、智慧树知到模拟电子技术基础（西安邮电大学版） 章节测试答案 第一章 1、 Which of the following is not a commonly used semiconductor material ? （ ） A:carbon B:lead C:silicon D:germanium 答案: lead 2、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
2、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、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 tempera
3、ture 答案: decrease 4、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 resist
4、or, and the ideal diode 5、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 1、What is the value of the voltage dropped across forward-biased silicon diodes that are con
5、nected in parallel with each other? （ ）. A:11.3 V B:35 V C:7 V D:4 V 答案: 7 V 2、The resistor voltage and resistor current in this circuit are （ ）.image.png 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、Which of the following circuits is used to eliminate a portion of a signal
6、? （ ）. A:Clipper B:Damper C:Voltage multiplier D:Voltage divider 答案: Clipper 4、The circuit shown here is a （ ）. image.png A:series clipper B:parallel clipper C:series clamper D:shunt clamper 答案: parallel clipper 5、The Zener diode must be operated such that （ ）. A:image.png B:image.png is less than t
7、he specified image.png C:the applied voltage is greater than image.png D:All of these 答案: All of these 第三章 1、In the active region, the base-emitter junction （ ）. A:and the base-collector junctions are both forward-biased B:and the base-collector junctions are both reverse-biased C:is forward-biased
8、while the base-collector junction is reversed- biased D:is reverse-biased while the base-collector junction is forward- biased 答案:C 2、A BJT has measured dc current values of image.png = 0.1 mA and image.png= 8.0 mA. When IB is varied by 100 A, IC changes by 10 mA. What is the value of the ac for thi
9、s device?（ ）. A:80 B:10 C:100 D:800 答案: C 3、When a BJT is operating in the active region, the voltage drop from the base to the emitter image.png is approximately equal to the （ ） 。 A:base bias voltage B:base current times the base resistor C:diode drop (about 0.7 V) D:emitter voltage 答案: C 4、BJTs a
10、re commonly used as （ ）. A:the primary components in amplifiers B:series damper circuits C:the primary components in rectifiers 答案: A 5、The condition where increase in bias current will not cause further increases in collector current is called （ ）. A:cutoff B:saturation C:active operation 答案: B 第四章
11、 1、When a BJT is biased in the cutoff region the collector-to-emitter voltage is typically equal to （ ）. A:the emitter voltage B:03 V C:the collector current times the collector resistor D:the collector supply voltage 答案: D 2、Calculate the collector-emitter voltage for this emitter-stabilized circui
12、t.（ ） image.png A:32 V B:10.68 V C:1335 V D:14.24 V 答案: 4.32 V 3、The difference between the resulting equations for a network in which an npn transistor has been replaced by a pnp transistor is （ ）. A:the values of the resistors B:the value of C:the sign associates with the particular quantities 答案:
13、 C 4、The term quiescent means （ ）. A:midpoint-biased B:at rest C:active D:inactive 答案: D 5、Voltage-divider bias stability is （ ）. A:dependent on alpha B:dependent of beta C:dependent on the collector resistor D:independent of beta 答案: D 第五章 1、Given this configuration, determine the input impedance i
14、f VS = 40 mV, Rsense = 0.5 k, and the input current is 20 A.（ ）image.png A:5 M B:822 M C:1,500 D:582 k 答案: C 2、The image.png transistor model replaces the （ ） with the junction diodes ac resistance. A:collector-base junction B:collector-emitter junction C:emitterbase junction 答案: C 3、Calculate the v
15、oltage gain for this circuit. （ ）image.png A:-137.25 B:-8.4 C: -7.91 D:-16.34 答案: A 4、A transistor amplifier has an input signal applied to its emitter terminal and an output signal taken from its collector terminal. The amplifier is a(n) （ ）. A:common-emitter amplifier B:common-base amplifier C:com
16、mon-collector amplifier D:emitter follower 答案: B 5、The voltage gain of a very well-designed common collector amplifier configuration, using a pnp transistor, is （ ）. A:about -0.9 B:about 0.9 C:in the range 0.95 to 0.99 D:in the range -0.95 to -0.99 答案: C 第六章 1、Shockleys equation defines the （ ） of the FET and are unaffected by
