Question 1

-The circuit in Figure  has values of Cbc = 5 pF and Av = 75. What is the value of CinM) for the circuit?

Accepted Answer

A)  0.07 pF 
B)  5 pF 
C)  375 pF 
D)  380 pF 
A)  0.07 pF 
B)  5 pF 
C)  375 pF 
D)  380 pF D

Question 2

-The circuit in Figure has values of Cbc = 5 pF and Av = 75. What is the value of CoutM) for the circuit?

Accepted Answer

A)  0.07 pF 
B)  5 pF 
C)  375 pF 
D)  380 pF 
A)  0.07 pF 
B)  5 pF 
C)  375 pF 
D)  380 pF B

Question 3

-The graph of dB level vs frequency is called a .

Accepted Answer

A)  Body graph 
B)  Body plot 
C)  Bode plot 
D)  All of the above. 
A)  Body graph 
B)  Body plot 
C)  Bode plot 
D)  All of the above. C

Question 4

- The portion of the graph labeled ʺeʺ represents .

Accepted Answer

A)  the 3dB cutoff band of frequencies 
B)  a 20dB/decade roll-off rate 
C)  a 6 dB/octave response curve 
D)  bandwidth 
A)  the 3dB cutoff band of frequencies 
B)  a 20dB/decade roll-off rate 
C)  a 6 dB/octave response curve 
D)  bandwidth

Question 5

A BJT amplifier has values of f1B = 5 kHz, f1E = 78 Hz, and f1C = 3.3kHz.What is the overall value of fC1 for the circuit?

Accepted Answer

A)  3.3 kHz 
B)  78 Hz 
C)  5 kHz 
D)  None of these is correct. 
A)  3.3 kHz 
B)  78 Hz 
C)  5 kHz 
D)  None of these is correct.

Question 6

The roll-off rate for an RC circuit is

Accepted Answer

A)  20 dB per octave. 
B)  6 dB per decade. 
C)  6 dB per octave. 
D)  None of these is correct. 
A)  20 dB per octave. 
B)  6 dB per decade. 
C)  6 dB per octave. 
D)  None of these is correct.

Question 7

Two identical amplifiers are cascaded. The overall bandwidth of the multistage amplifier is the bandwidth of each individual stage.

Accepted Answer

A)  equal to 
B)  more narrow than 
C)  wider than 
A)  equal to 
B)  more narrow than 
C)  wider than

Question 8

-The transistor amplifier in Figure  has the following values: hie = 2 kΩ, hfe = 120, Cbc = 5 pF, Cbe = 10 pF, RS = 300 Ω, Rth = 1.2 kΩ, rc = 4 kΩ, and Cin = 1200 pF. What is the value of CinM) for the circuit?

Accepted Answer

A)  6.2 pF 
B)  15 pF 
C)  1205 pF 
D)  2410 pF 
A)  6.2 pF 
B)  15 pF 
C)  1205 pF 
D)  2410 pF

Question 9

The bandwidth of an amplifier is

Accepted Answer

A)  the range of frequencies over which gain remains relatively constant. 
B)  the range of frequencies between its lower and upper 3 dB frequencies. 
C)  the difference between fc2 -and fc1. 
D)  All of the above. 
A)  the range of frequencies over which gain remains relatively constant. 
B)  the range of frequencies between its lower and upper 3 dB frequencies. 
C)  the difference between fc2 -and fc1. 
D)  All of the above.

Question 10

An amplifier normally has a power gain of 12,000. If the power gain of the circuit drops by 3 dB, the value of Ap will be approximately

Accepted Answer

A)  6,000. 
B)  4,000. 
C)  9,000. 
D)  zero. 
A)  6,000. 
B)  4,000. 
C)  9,000. 
D)  zero.

Question 11

An amplifier has values of Pin = 20 mW and Pout = 60 W. What is the power gain of the circuit?

Accepted Answer

A)  3000 dB 
B)  69.5 dB 
C)  34.4 dB 
D)  None of the above. 
A)  3000 dB 
B)  69.5 dB 
C)  34.4 dB 
D)  None of the above.

Question 12

-The transistor amplifier in Figure  has the following values: hie = 2 kΩ, hfe = 120, Cbc = 5 pF, Cbe = 10 pF, RS = 300 Ω, Rth = 1.2 kΩ, rc = 4 kΩ, and Cin = 1200 pF. What is the voltage gain of the circuit?

Accepted Answer

A)  0.24 
B)  2 
C)  240 
D)  480,000 
A)  0.24 
B)  2 
C)  240 
D)  480,000

Question 13

-The equivalent circuit in Figure  is used to

Accepted Answer

A)  determine the values of fC1 and fC2. 
B)  determine the value of fC1. 
C)  determine the value of fC2. 
D)  determine none of the values listed here. 
A)  determine the values of fC1 and fC2. 
B)  determine the value of fC1. 
C)  determine the value of fC2. 
D)  determine none of the values listed here.

Question 14

An amplifier has a midband power gain of 24,500. Which of the following expresses this gain in dB?

Accepted Answer

A)  87.78 dB 
B)  43.9 dB 
C)  4.39 dB 
D)  None of the above. 
A)  87.78 dB 
B)  43.9 dB 
C)  4.39 dB 
D)  None of the above.

Question 15

What frequency is two decades above 5 kHz?

Accepted Answer

A)  25 kHz 
B)  105 kHz 
C)  500 kHz 
D)  Cannot be determined from the information given. 
A)  25 kHz 
B)  105 kHz 
C)  500 kHz 
D)  Cannot be determined from the information given.

Question 16

An amplifier has values of fc1 = 100 kHz and f0 = 200 kHz. What is the value of fc2 for the circuit?

Accepted Answer

A)  300 kHz 
B)  141.4 kHz 
C)  400 kHz 
D)  460 kHz 
A)  300 kHz 
B)  141.4 kHz 
C)  400 kHz 
D)  460 kHz

Question 17

An amplifier has values of f0 = 31.6 kHz and fc2 = 1 MHz. What is the approximate value of fc1?

Accepted Answer

A)  31.6 Hz 
B)  1 kHz 
C)  178 kHz 
D)  12 kHz 
A)  31.6 Hz 
B)  1 kHz 
C)  178 kHz 
D)  12 kHz

Question 18

An amplifier has values of fc2 = 500 kHz and fc1 = 40 kHz. The center frequency for the circuit is approximately .

Accepted Answer

A)  141 kHz 
B)  230 kHz 
C)  270 kHz 
D)  460 kHz 
A)  141 kHz 
B)  230 kHz 
C)  270 kHz 
D)  460 kHz

Question 19

-The transistor amplifier in Figure has the following values: hie = 2 kΩ, hfe = 120, Cbc = 5 pF, Cbe = 10 pF, RS = 300 Ω, Rth = 1.2 kΩ, rc = 4 kΩ, and Cin = 1200 pF. What is the value if f2C for the circuit?

Accepted Answer

A)  16.54 kHz 
B)  33.02 kHz 
C)  330 kHz 
D)  7.958 MHz 
A)  16.54 kHz 
B)  33.02 kHz 
C)  330 kHz 
D)  7.958 MHz

Question 20

-The component labeled CoutM) in Figure represents the ouput capacitance.

Accepted Answer

A)  medium. 
B)  MOSFET. 
C)  modulation. 
D)  Miller. 
A)  medium. 
B)  MOSFET. 
C)  modulation. 
D)  Miller.

Exam 14: Amplifier Frequency Response

-The circuit in Figure has values of Cbc = 5 pF and Av = 75. What is the value of CinM) for the circuit?

-The circuit in Figure has values of Cbc = 5 pF and Av = 75. What is the value of CoutM) for the circuit?

-The graph of dB level vs frequency is called a .

- The portion of the graph labeled ʺeʺ represents .

A BJT amplifier has values of f1B = 5 kHz, f1E = 78 Hz, and f1C = 3.3kHz.What is the overall value of fC1 for the circuit?

The roll-off rate for an RC circuit is

Two identical amplifiers are cascaded. The overall bandwidth of the multistage amplifier is the bandwidth of each individual stage.

-The transistor amplifier in Figure has the following values: hie = 2 kΩ, hfe = 120, Cbc = 5 pF, Cbe = 10 pF, RS = 300 Ω, Rth = 1.2 kΩ, rc = 4 kΩ, and Cin = 1200 pF. What is the value of CinM) for the circuit?

The bandwidth of an amplifier is

An amplifier normally has a power gain of 12,000. If the power gain of the circuit drops by 3 dB, the value of Ap will be approximately

An amplifier has values of Pin = 20 mW and Pout = 60 W. What is the power gain of the circuit?

-The transistor amplifier in Figure has the following values: hie = 2 kΩ, hfe = 120, Cbc = 5 pF, Cbe = 10 pF, RS = 300 Ω, Rth = 1.2 kΩ, rc = 4 kΩ, and Cin = 1200 pF. What is the voltage gain of the circuit?

-The equivalent circuit in Figure is used to

An amplifier has a midband power gain of 24,500. Which of the following expresses this gain in dB?

What frequency is two decades above 5 kHz?

An amplifier has values of fc1 = 100 kHz and f0 = 200 kHz. What is the value of fc2 for the circuit?

An amplifier has values of f0 = 31.6 kHz and fc2 = 1 MHz. What is the approximate value of fc1?

An amplifier has values of fc2 = 500 kHz and fc1 = 40 kHz. The center frequency for the circuit is approximately .

-The transistor amplifier in Figure has the following values: hie = 2 kΩ, hfe = 120, Cbc = 5 pF, Cbe = 10 pF, RS = 300 Ω, Rth = 1.2 kΩ, rc = 4 kΩ, and Cin = 1200 pF. What is the value if f2C for the circuit?

-The component labeled CoutM) in Figure represents the ouput capacitance.

Fundamental Solid-State Principles

Diodes

Common Diode Applications: Basic Power Supply Circuits

Common Diode Applications: Clippers, Clampers, Voltage Multipliers, and Displays

Special Applications Diodes

Bipolar Junction Transistors

DC Biasing Circuits

Introduction to Amplifiers

Common-Emitter Amplifiers

Other BJT Amplifiers

Power Amplifiers

Field-Effect Transistors

Mosfets

Operational Amplifiers

Additional Op-Amp Applications

Tuned Amplifiers

Oscillators

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters