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-The circuit in Figure is a amplifier. A) Common emitter B) Common collector C) Common base D) Class C -The circuit in Figure is a amplifier.


A) Common emitter
B) Common collector
C) Common base
D) Class C

E) C) and D)
F) All of the above

Correct Answer

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-An amplifier has two transistors, one npn and one pnp. The transistor emitters are connected to each other and to the load. The amplifier is most likely a A) Common Emitter amplifier. B) Class A amplifier. C) Class B amplifier. D) Class C amplifier. -An amplifier has two transistors, one npn and one pnp. The transistor emitters are connected to each other and to the load. The amplifier is most likely a


A) Common Emitter amplifier.
B) Class A amplifier.
C) Class B amplifier.
D) Class C amplifier.

E) A) and B)
F) None of the above

Correct Answer

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-Assuming the source voltage is constant, vL if Zin decreases. A) increases B) decreases C) remains unchanged -Assuming the source voltage is constant, vL if Zin decreases.


A) increases
B) decreases
C) remains unchanged

D) A) and B)
E) A) and C)

Correct Answer

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An amplifier draws 1.8 W from its dc power supply and delivers 250 mW to its load. What is the efficiency of the amplifier?


A) 45%
B) 13.9%
C) 87.8%
D) 12.2%

E) A) and B)
F) A) and D)

Correct Answer

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- Which of the following circuit values is greater than the other two? A) Voltage gain Av) B) Current gain Ai) C) Power gain Ap) - Which of the following circuit values is greater than the other two?


A) Voltage gain Av)
B) Current gain Ai)
C) Power gain Ap)

D) B) and C)
E) A) and C)

Correct Answer

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-An amplifier contains a single transistor with an LC tank in its collector circuit. The amplifier is most likely a/an A) Tuned amplifier. B) Voltage-divider amplifier. C) Emitter follower. D) Reactance amplifier. -An amplifier contains a single transistor with an LC tank in its collector circuit. The amplifier is most likely a/an


A) Tuned amplifier.
B) Voltage-divider amplifier.
C) Emitter follower.
D) Reactance amplifier.

E) C) and D)
F) B) and C)

Correct Answer

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Which class of amplifier has the highest efficiency?


A) Class A
B) Class B
C) Class C

D) B) and C)
E) A) and C)

Correct Answer

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-An ideal amplifier has Zin. A) infinite B) low C) zero D) high -An ideal amplifier has Zin.


A) infinite
B) low
C) zero
D) high

E) B) and D)
F) B) and C)

Correct Answer

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An amplifier with a value of Av = 20 dB. What input voltage is required for the amplifier to provide an 8.5 V output?


A) 850 mV
B) 85 mV
C) 425 mV
D) 186 mV

E) A) and D)
F) None of the above

Correct Answer

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-Assuming the circuit voltage gain is constant, what happens to vL when Zout decreases? A) It increases B) It decreases C) It remains unchanged -Assuming the circuit voltage gain is constant, what happens to vL when Zout decreases?


A) It increases
B) It decreases
C) It remains unchanged

D) B) and C)
E) A) and C)

Correct Answer

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