BJT Amplifiers - General Questions (3)

Directions to Solve

BJT Amplifiers - General Questions

17.

Refer to this figure. Find the value of R_in(base).

mcq6_1009_1 (2)1

A.	420
B.	50 k
C.	940
D.	100.8

Answer: Option B

Explanation:

No answer description available for this question.

18.

Which of the following configurations has an output impedance Z_o equal to R_C?

A.	Fixed-bias common-emitter
B.	Common-emitter voltage-divider with bypass capacitor
C.	Common-emitter voltage-divider without bypass capacitor
D.	All of the above

Answer: Option D

Explanation:

No answer description available for this question.

19.

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.

20.

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.

21.

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

A.	0Âº
B.	45Âº
C.	90Âº
D.	180Âº

Answer: Option D

Explanation:

No answer description available for this question.

22.

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.

23.

In an unbypassed emitter bias configuration h_ie replaces ________ in the r_e model.

A.	re
B.
C.	re
D.	Ib

Answer: Option C

Explanation:

No answer description available for this question.

24.

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: Option D

Explanation:

No answer description available for this question.

BJT Amplifiers - General Questions (3)

BJT Amplifiers - General Questions

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