第三章 BIPOLAR JUNCTION TRANSISTORS：介绍双极型晶体管的放大原理和电路组态分析。3.1晶体管结构及工作原理:本节讲解Bipolar Junction Transistors，双极型晶体管的结构及其工作原理。[单选题]BJTs are commonly used as （ ）.选项:[the primary components in rectifiers, series damper circuits, the primary components in amplifiers]
3.2晶体管的组态和特性曲线:本节介绍晶体三极管的特性曲线和放大原理，我们要结合晶体管的电路来分析晶体管的特性曲线，晶体管在电路中的连接方式晶体管的输入端，输出端和公共端的连接关系，有这样三种情况，当输入端结发射极，输出端接集电极，公共端接基极，我们称为共基极接法，简称CB电路。
3.3晶体管的电流关系和放大原理:本节介绍讲晶体管的电流关系及其放大原理。
[单选题]The condition where increase in bias current will not cause further increases in collector current is called （ ）.选项:[cutoff, saturation, active operation]
[单选题]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?（ ）.选项:[100, 10, 800 , 80][单选题]In the active region, the base-emitter junction （ ）.选项:[and the base-collector junctions are both reverse-biased, is forward-biased while the base-collector junction is reversed-biased, and the base-collector junctions are both forward-biased, is reverse-biased while the base-collector junction is forward-biased]
[单选题]When a BJT is operating in the active region, the voltage drop from the base to the emitter
is approximately equal to the （ ）。 选项:[base bias voltage, emitter voltage, base current times the base resistor, diode drop (about 0.7 V) ]
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