β is the ratio of _____（）
A. collector current to emitter current
B. base current to collector current
C. collector current to base current
D. emitter current to collector current
查看答案
Why is the arrow on the BJT schematic symbol important（）
A. It identifies the emitter terminal and the type of BJT
B. It identifies the collector terminal and the type of BJT
C. It identifies the base terminal and the type of BJT
D. None of the above
In a small-signal transistor, the typical range of the parameter α is _____（）
A. greater than 1
B. between 0 and 1
C. almost equal to 1 but always less than 1 （0.9 to 1.0）
D. almost equal to 1 but always greater than 1 （1.0 to 1.1）
Pentavalent atoms are often referred to as _____（）
A. donor atoms
B. minority carriers
C. acceptor atoms
D. majority carriers
Which of the following circuits is used to change the dc reference of a signal without changing the shape of the signal（）
A. a clipper
B. a clamper
C. a voltage multiplier
D. a voltage divider
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