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Electronic Devices - BJT Amplifiers

Exercise : BJT Amplifiers - General Questions
56.
Which of the following configurations has a voltage gain of –RC /re?
Fixed-bias common-emitter
Common-emitter voltage-divider with bypass capacitor
Fixed-bias common-emitter and voltage-divider with bypass capacitor
Common-emitter voltage-divider without bypass capacitor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
57.
An emitter-follower amplifier has an input impedance of 107 k. The input signal is 12 mV. The approximate output voltage is (common-collector)
8.92 V
112 mV
12 mV
8.9 mV
Answer: Option
Explanation:
No answer description is available. Let's discuss.
58.
Which of the following is (are) true regarding the output impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?
The output impedance is purely resistive.
It varies from a few ohms to more than 2 M.
An ohmmeter cannot be used to measure the small-signal ac output impedance.
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
59.
Refer to this figure. The output signal from the first stage of this amplifier is 0 V. The trouble could be caused by

an open C4.
an open C2.
an open base-emitter of Q1.
a shorted C4.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
60.
What is the limit of the efficiency defined by = Po / Pi?
Greater than 1
Less than 1
Always 1
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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