第三章测试1.
In the active region, the base-emitter junction （ ）.
A:and the base-collector junctions are both reverse-biased B:is reverse-biased while the base-collector junction is forward-biased C:and the base-collector junctions are both forward-biased D:is forward-biased while the base-collector junction is reversed-biased
答案:D
2.
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?（ ）.
A:800 B:10 C:80 D:100 3.
When a BJT is operating in the active region, the voltage drop from the base to the emitter 
is approximately equal to the （ ）。
A:base bias voltage B:diode drop (about 0.7 V) C:base current times the base resistor D:emitter voltage 4.
BJTs are commonly used as （ ）.
A:series damper circuits B:the primary components in amplifiers C:the primary components in rectifiers 5.
The condition where increase in bias current will not cause further increases in collector current is called （ ）.
A:saturation B:active operation C:cutoff
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