Question 1

A fast and simple method to test the frequency response of an amplifier is

Accepted Answer

A)  by using sine-wave testing. 
B)  by using square-wave testing. 
C)  by measuring dc voltages. 
D)  by measuring resistance values. 
A)  by using sine-wave testing. 
B)  by using square-wave testing. 
C)  by measuring dc voltages. 
D)  by measuring resistance values. B

Question 2

What is one method used to reduce high frequency loss in amplifiers?

Accepted Answer

A)  use large coupling capacitors 
B)  increase lengths of wires used between stages 
C)  use transformer coupling 
D)  keep wires as short as possible 
A)  use large coupling capacitors 
B)  increase lengths of wires used between stages 
C)  use transformer coupling 
D)  keep wires as short as possible D

Question 3

Most amplifiers are now being built using

Accepted Answer

A)  BJTs. 
B)  MOSFETs. 
C)  power amps. 
D)  op amps. 
A)  BJTs. 
B)  MOSFETs. 
C)  power amps. 
D)  op amps. D

Question 4

In a dc amplifier,all the frequencies from zero up to the cutoff frequency is referred to as the

Accepted Answer

A)  roll off. 
B)  maximum band. 
C)  notch frequencies. 
D)  bandwidth. 
A)  roll off. 
B)  maximum band. 
C)  notch frequencies. 
D)  bandwidth.

Question 5

A common-emitter amplifier that uses coupling and bypass capacitors is an example of a dc amplifier.

Accepted Answer

A) True 
 B)False

Question 6

Stray capacitance and inductance become serious considerations for discrete and IC devices that are operating

Accepted Answer

A)  below 100 kHz. 
B)  above 100 kHz. 
C)  above 100 Hz. 
D)  below 100 Hz. 
A)  below 100 kHz. 
B)  above 100 kHz. 
C)  above 100 Hz. 
D)  below 100 Hz.

Question 7

Ac amplifier voltage gain decreases at low frequencies because

Accepted Answer

A)  coupling and bypass capacitive reactances increase. 
B)  coupling and bypass capacitive reactances decrease. 
C)  coupling and bypass capacitors act like short circuits. 
D)  direct coupling is used. 
A)  coupling and bypass capacitive reactances increase. 
B)  coupling and bypass capacitive reactances decrease. 
C)  coupling and bypass capacitors act like short circuits. 
D)  direct coupling is used.

Question 8

The frequencies at which the voltage gain equals 0.707 of its maximum value are called the

Accepted Answer

A)  tuned RF frequencies. 
B)  full-power frequencies. 
C)  cutoff frequencies. 
D)  midband frequencies. 
A)  tuned RF frequencies. 
B)  full-power frequencies. 
C)  cutoff frequencies. 
D)  midband frequencies.

Question 9

What type of scale compresses very large values and allows many decades to be seen?

Accepted Answer

A)  linear 
B)  logarithmic 
C)  nonlinear 
D)  algebraic 
A)  linear 
B)  logarithmic 
C)  nonlinear 
D)  algebraic

Question 10

When decibels are used to indicate the power level above 1 mW,what is the accepted label used?

Accepted Answer

A)  dBV 
B)  dBm 
C)  VdB 
D)  mWdB 
A)  dBV 
B)  dBm 
C)  VdB 
D)  mWdB

Question 11

What is a dc amplifier that has high voltage gain,high input impedance,and low output impedance?

Accepted Answer

A)  BJT 
B)  MOSFET 
C)  op amp 
D)  JFET 
A)  BJT 
B)  MOSFET 
C)  op amp 
D)  JFET

Question 12

What is the fastest and most accurate way to analyze the frequency response of a discrete BJT or FET amplifier?

Accepted Answer

A)  use Multisim or other circuit simulation software 
B)  use square wave testing 
C)  use sine wave injection and oscilloscope signal tracing 
D)  use frequency generator injection and frequency counter testing 
A)  use Multisim or other circuit simulation software 
B)  use square wave testing 
C)  use sine wave injection and oscilloscope signal tracing 
D)  use frequency generator injection and frequency counter testing

Question 13

If an amplifier has a voltage gain of 100,000,it has a decibel voltage gain of ________.

Accepted Answer

A)  1 dB 
B)  10 dB 
C)  20 dB 
D)  100 dB 
A)  1 dB 
B)  10 dB 
C)  20 dB 
D)  100 dB

Question 14

The total decibel voltage gain of two cascaded stages equals the sum of the individual decibel voltage gains.

Accepted Answer

A) True 
 B)False

Question 15

A reason for using decibel power gain is

Accepted Answer

A)  that logarithms compress numbers. 
B)  that logarithms expand numbers. 
C)  that a decibel equals a watt. 
D)  that a decibel is 10 times larger than a logarithm. 
A)  that logarithms compress numbers. 
B)  that logarithms expand numbers. 
C)  that a decibel equals a watt. 
D)  that a decibel is 10 times larger than a logarithm.

Question 16

A Bode plot is a graph that uses decibels and provides more information about the amplifier's response outside the midband.

Accepted Answer

A) True 
 B)False

Question 17

If stage one of a cascaded amplifier system has a decibel voltage gain of 30 and stage two has a decibel voltage gain of 40,what is the total decibel voltage gain?

Accepted Answer

A)  30 
B)  40 
C)  70 
D)  1200 
A)  30 
B)  40 
C)  70 
D)  1200

Question 18

What produces a lag in the output voltage of an RC bypass circuit?

Accepted Answer

A)  charging of a capacitor 
B)  discharging of a capacitor 
C)  charging and discharging of a capacitor 
D)  value of the supply voltage 
A)  charging of a capacitor 
B)  discharging of a capacitor 
C)  charging and discharging of a capacitor 
D)  value of the supply voltage

Question 19

The total voltage gain of a two-stage cascaded amplifier is the

Accepted Answer

A)  voltage gain of the individual stage. 
B)  sum of the individual voltage gains. 
C)  product of the individual voltage gains. 
D)  difference of the voltage gains. 
A)  voltage gain of the individual stage. 
B)  sum of the individual voltage gains. 
C)  product of the individual voltage gains. 
D)  difference of the voltage gains.

Question 20

A type of graph that uses decibels and provides more information about the amplifier's response outside the midband is the

Accepted Answer

A)  response curve. 
B)  decibel curve. 
C)  frequency plot. 
D)  Bode plot. 
A)  response curve. 
B)  decibel curve. 
C)  frequency plot. 
D)  Bode plot.

Exam 14: Frequency Effects

A fast and simple method to test the frequency response of an amplifier is

What is one method used to reduce high frequency loss in amplifiers?

Most amplifiers are now being built using

In a dc amplifier,all the frequencies from zero up to the cutoff frequency is referred to as the

A common-emitter amplifier that uses coupling and bypass capacitors is an example of a dc amplifier.

Stray capacitance and inductance become serious considerations for discrete and IC devices that are operating

Ac amplifier voltage gain decreases at low frequencies because

The frequencies at which the voltage gain equals 0.707 of its maximum value are called the

What type of scale compresses very large values and allows many decades to be seen?

When decibels are used to indicate the power level above 1 mW,what is the accepted label used?

What is a dc amplifier that has high voltage gain,high input impedance,and low output impedance?

What is the fastest and most accurate way to analyze the frequency response of a discrete BJT or FET amplifier?

If an amplifier has a voltage gain of 100,000,it has a decibel voltage gain of ________.

The total decibel voltage gain of two cascaded stages equals the sum of the individual decibel voltage gains.

A reason for using decibel power gain is

A Bode plot is a graph that uses decibels and provides more information about the amplifier's response outside the midband.

If stage one of a cascaded amplifier system has a decibel voltage gain of 30 and stage two has a decibel voltage gain of 40,what is the total decibel voltage gain?

What produces a lag in the output voltage of an RC bypass circuit?

The total voltage gain of a two-stage cascaded amplifier is the

A type of graph that uses decibels and provides more information about the amplifier's response outside the midband is the

Introduction

Semoconductors

Diode Theory Key

Diode Circuits

Special-Purpose Diodes Key

BJT Fumdamentals

BJT Biasing

Basic BJT Amplifiers

Multistage,CC,and CB Amplifiers

Power Amplifiers

JFETS

Mosfets

Thyristors

Differential Amplifiers

Operational Amplifiers

Negative Feedback

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