Question 1

Which class of amplifier conducts throughout 360° of its input signal?

Accepted Answer

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

Question 2

- Which of the following circuit values is greater than the other two?

Accepted Answer

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

Question 3

An amplifier is driven by a 200 mV source with an internal resistance RS) of 50 Ω. If Zin is 150 Ω, what is the value of vin?

Accepted Answer

A)   600 mV
B)   66.7 mV
C)   50 mV
D)   150 mV D

Question 4

An amplifier with an efficiency rating of 18% draws 3.25 W from its dc power supply. What is the maximum power it can deliver to its load?

Accepted Answer

A)   585 mW
B)   55 mW
C)   18 W
D)   58.5 mW

Question 5

An amplifier with a 100 mW input provides a 3.25 W output . What is the power gain of the amplifier?

Accepted Answer

A)   30.2 dB
B)   -4.9 dB
C)   4.9 dB
D)   15.1 dB

Question 6

Which BJT amplifier configuration typically provides the lowest input impedance?

Accepted Answer

A)   The common emitter amplifier
B)   The common base amplifier
C)   The common collector amplifier

Question 7

-The circuit in Figure is a amplifier.

Accepted Answer

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

Question 8

What is the dB power gain of an amplifier if Av = 20dB and Rin and Rout are equal?

Accepted Answer

A)   20dB
B)   10dB
C)   -3dB
D)   40dB

Question 9

An amplifier has signal values of vin = 30 mV and vout = 1.8 V. What is the voltage gain of the amplifier?

Accepted Answer

A)   30
B)   0.06
C)   60
D)   54

Question 10

-This circuit would have relatively Zin and Zout.

Accepted Answer

A)   low; low
B)   low; high
C)   high; low
D)   high; high

Question 11

-Effective voltage gain is always Av.

Accepted Answer

A)   greater than or equal to
B)   less than or equal to
C)   equal to

Question 12

A amplifier is normally a tuned amplifier.

Accepted Answer

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

Question 13

-This circuit is a

Accepted Answer

A)   Class A amplifier
B)   Class B amplifier
C)   Class C amplifier
D)   Common base amplifier

Question 14

An amplifier has values of Av = 300 and vout = 2.63 V. What is the magnitude of the amplifier input voltage?

Accepted Answer

A)   786 mV
B)   8.77 mV
C)   8.77 μV
D)   114 mV

Question 15

-The amplifier in Figure  has the following values: Zout = 1.2 kΩ, RL = 3.3 kΩ, vout = 18.6 V. What is the value of the load voltage?

Accepted Answer

A)   13.6 V
B)   6.78 V
C)   51.3 V
D)   4.07 V

Question 16

-An ideal amplifier has Zout.

Accepted Answer

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

Question 17

A class B amplifier is subject to:

Accepted Answer

A)   non-linear distortion.
B)   crossover distortion.
C)   class C interference.
D)   Answer A and BChapter 8 Introduction to Amplifiers Answer Key

Question 18

- This circuit would have relatively Zin and Zout.

Accepted Answer

A)   low; low
B)   midrange; midrange
C)   high; high
D)   low; high
E)   high; low

Question 19

Which BJT amplifier configuration typically provides the highest power gain?

Accepted Answer