BJT Amplifiers - General Questions (2)

Directions to Solve

BJT Amplifiers - General Questions

What is the limit of the efficiency defined by = P_o / P_i?

A.	Greater than 1
B.	Less than 1
C.	Always 1
D.	None of the above

Answer: Option B

Explanation:

No answer description available for this question.

10.

Refer to this figure. The output signal from the first stage of this amplifier is 0 V. The trouble could be caused by

mcq6_1019_1 (1)

A.	an open C4.
B.	an open C2.
C.	an open base-emitter of Q1.
D.	a shorted C4.

Answer: Option C

Explanation:

No answer description available for this question.

11.

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: Option D

Explanation:

No answer description available for this question.

12.

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: Option C

Explanation:

No answer description available for this question.

13.

Which of the following configurations has a voltage gain of –R_C /r_e?

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: Option C

Explanation:

No answer description available for this question.

14.

The loaded voltage gain of an amplifier is always more than the no-load level.

A.	True
B.	False

Answer: Option B

Explanation:

No answer description available for this question.

15.

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: Option B

Explanation:

No answer description available for this question.

16.

For a common-emitter amplifier, the purpose of the emitter bypass capacitor is

A.	no purpose, since it is shorted out by RE.
B.	to reduce noise.
C.	to despike the supply voltage.
D.	to maximize amplifier gain.

Answer: Option D

Explanation:

No answer description available for this question.

BJT Amplifiers - General Questions (2)

BJT Amplifiers - General Questions

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