Exercise: Bjt Amplifiers

Questions for: Bjt Amplifiers

For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.
A:
0º
B:
45º
C:
90º
D:
180º
Answer: D
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Which of the following is (are) true regarding the input impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?
A:
The input impedance is purely resistive.
B:
It varies from a few ohms to megohms.
C:
An ohmmeter cannot be used to measure the small-signal ac input impedance.
D:
All of the above
Answer: D
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In an unbypassed emitter bias configuration hie replaces ________ in the re model.
A:
re
B:
C:
re
D:
Ib
Answer: C
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Which of the following should be done to obtain the ac equivalent of a network?
A:
Set all dc sources to zero
B:
Replace all capacitors by a short-circuit equivalent.
C:
Remove all elements bypassed by the short-circuit equivalent.
D:
All of the above
Answer: D
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The dc emitter current of a transistor is 8 mA. What is the value of re?
A:
320
B:
13.3 k
C:
3.125
D:
5.75
Answer: C
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