Electronic Devices - BJT Amplifiers

Exercise :: BJT Amplifiers - General Questions

46. 

In an unbypassed emitter bias configuration hie replaces ________ in the re model.

A. re
B.
C. re
D. Ib

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

47. 

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: Option D

Explanation:

No answer description available for this question. Let us discuss.

48. 

For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.

A.
B. 45º
C. 90º
D. 180º

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

49. 

A common-collector amplifier has ________ input resistance, ________ current gain, and ________ voltage gain.

A. high, high, low
B. high, low, low
C. high, low, high

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

50. 

The total gain of a multistage amplifier is the ________.

A. sum of individual voltage gains
B. sum of dB voltage gains

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.