Exercise: Bjt Amplifiers

Questions for: Bjt Amplifiers

Which of the following is (are) true regarding the output impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?
A:
The output impedance is purely resistive.
B:
It varies from a few ohms to more than 2 M.
C:
An ohmmeter cannot be used to measure the small-signal ac output impedance.
D:
All of the above
Answer: D
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An emitter-follower amplifier has an input impedance of 107 k. The input signal is 12 mV. The approximate output voltage is (common-collector)
A:
8.92 V
B:
112 mV
C:
12 mV
D:
8.9 mV
Answer: C
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Which of the following configurations has a voltage gain of –RC /re?
A:
Fixed-bias common-emitter
B:
Common-emitter voltage-divider with bypass capacitor
C:
Fixed-bias common-emitter and voltage-divider with bypass capacitor
D:
Common-emitter voltage-divider without bypass capacitor
Answer: C
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The loaded voltage gain of an amplifier is always more than the no-load level.
A:
True
B:
False
C:
D:
Answer: B
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For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.
A:
voltage
B:
current
C:
impedance
D:
All of the above
Answer: B
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