Electronic Devices - BJT Amplifiers

Exercise :: BJT Amplifiers - General Questions

41. 

Under which of the following conditions is the output impedance of the network approximately equal to RC for a common-emitter fixed-bias configuration?

A. ro 10RC
B. ro < 10RC
C. ro < ro
D. ro > ro

Answer: Option A

Explanation:

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42. 

Which of the following gains is less than 1 for a common-base configuration?

A. Ai
B. Av
C. Ap
D. None of the above

Answer: Option A

Explanation:

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43. 

Which of the following define(s) the conversion efficiency?

A. Ac power to the load/ac input power
B. Ac power to the load/dc power supplied
C. Dc output power/ac input power
D. All of the above

Answer: Option B

Explanation:

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44. 

The dc emitter current of a transistor is 8 mA. What is the value of re?

A. 320
B. 13.3 k
C. 3.125
D. 5.75

Answer: Option C

Explanation:

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45. 

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:

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