Question 1

Butterworth active filters are generally preferred over Chebyshev active filters because

Accepted Answer

A)  Butterworth filters are easier to construct. 
B)  Butterworth filters have higher roll-off rates. 
C)  the midband gain of the Chebyshev filter is inconsistent. 
D)  Chebyshev filters have higher roll-off rates. 
A)  Butterworth filters are easier to construct. 
B)  Butterworth filters have higher roll-off rates. 
C)  the midband gain of the Chebyshev filter is inconsistent. 
D)  Chebyshev filters have higher roll-off rates. C

Question 2

The frequency ranges) outside of the bandwidth of a given tuned amplifier is referred to as the

Accepted Answer

A)  pass band. 
B)  stop band. 
C)  drop band. 
D)  standard band. 
A)  pass band. 
B)  stop band. 
C)  drop band. 
D)  standard band. B

Question 3

The transistor in a Class C amplifier will conduct for .

Accepted Answer

A)  less than 180° 
B)  more than 180° but less than 360° 
C)  360° 
D)  0° since it is biased at cutoff 
A)  less than 180° 
B)  more than 180° but less than 360° 
C)  360° 
D)  0° since it is biased at cutoff A

Question 4

-The cutoff frequency for the circuit in Figure  is approximately

Accepted Answer

A)  66 Hz. 
B)  94 Hz. 
C)  133 Hz. 
D)  188 Hz. 
A)  66 Hz. 
B)  94 Hz. 
C)  133 Hz. 
D)  188 Hz.

Question 5

A bandpass filter has values of f0 = 1.5 MHz and BW = 100 kHz. What is the value of fC2 for the circuit?

Accepted Answer

A)  1.6 MHz 
B)  1.55 MHz 
C)  1.45 MHz 
D)  1.4 MHz 
A)  1.6 MHz 
B)  1.55 MHz 
C)  1.45 MHz 
D)  1.4 MHz

Question 6

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, and RL = 10 kΩ. What is the equivalent parallel resistance for Rw?

Accepted Answer

A)  50Ω 
B)  10 kΩ 
C)  Q = 20 
D)  20 kΩ 
A)  50Ω 
B)  10 kΩ 
C)  Q = 20 
D)  20 kΩ

Question 7

A tuned amplifier has values of f0 = 1.3 MHz and Q = 54. What is the bandwidth of the circuit?

Accepted Answer

A)  24 kHz 
B)  70.2 MHz 
C)  54 kHz 
D)  None of these answers are correct. 
A)  24 kHz 
B)  70.2 MHz 
C)  54 kHz 
D)  None of these answers are correct.

Question 8

-The circuit in Figure  is a

Accepted Answer

A)  multiple feedback bandpass filter. 
B)  multiple feedback notch filter. 
C)  Sallen-Key low-pass filter. 
D)  Sallen-Key high-pass filter. 
A)  multiple feedback bandpass filter. 
B)  multiple feedback notch filter. 
C)  Sallen-Key low-pass filter. 
D)  Sallen-Key high-pass filter.

Question 9

The operation of a class C amplifier is based on the

Accepted Answer

A)  LC effect. 
B)  flywheel effect. 
C)  Miller effect. 
D)  class C effect. 
A)  LC effect. 
B)  flywheel effect. 
C)  Miller effect. 
D)  class C effect.

Question 10

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, and f0 = 1200 Hz. Assuming the load resistance is infinite, what is the circuit bandwidth?

Accepted Answer

A)  20 Hz 
B)  40 Hz 
C)  60 Hz 
D)  200 Hz 
A)  20 Hz 
B)  40 Hz 
C)  60 Hz 
D)  200 Hz

Question 11

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, and RL = 10 kΩ. What is the quality Q) of the circuit?

Accepted Answer

A)  6.66 
B)  20 
C)  50 
D)  100 
A)  6.66 
B)  20 
C)  50 
D)  100

Question 12

-The circuit in Figure  is a

Accepted Answer

A)  Sallen-Key low-pass filter. 
B)  Sallen-Key high-pass filter. 
C)  multiple-feedback bandpass filter. 
D)  multiple-feedback notch filter. 
A)  Sallen-Key low-pass filter. 
B)  Sallen-Key high-pass filter. 
C)  multiple-feedback bandpass filter. 
D)  multiple-feedback notch filter.

Question 13

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, RL = 10 kΩ and f0 = 1200 Hz. What is the circuit bandwidth?

Accepted Answer

A)  60 Hz 
B)  180 Hz 
C)  360 Hz 
D)  500 Hz
Chapter 17 Tuned Amplifiers Answer Key 
A)  60 Hz 
B)  180 Hz 
C)  360 Hz 
D)  500 Hz
Chapter 17 Tuned Amplifiers Answer Key

Question 14

-The closed-loop gain of the circuit in Figure is

Accepted Answer

A)  0 dB. 
B)  6 dB. 
C)  10 dB. 
D)  26 dB. 
A)  0 dB. 
B)  6 dB. 
C)  10 dB. 
D)  26 dB.

Question 15

A class C amplifier is being designed to accept a +5 Vpk input. What biasing voltage should be applied to the base of the transistor?

Accepted Answer

A)  -5 V 
B)  -4 V 
C)  -3 V 
D)  +4 V 
A)  -5 V 
B)  -4 V 
C)  -3 V 
D)  +4 V

Question 16

A discrete tuned amplifier has the following values: L = 10 mH, RW = 3 Ω, and C = 0.1 μF. What is the value of f0 for the amplifier?

Accepted Answer

A)  15.9 MHz 
B)  1.59 kHz 
C)  3.18 kHz 
D)  5.03 kHz 
A)  15.9 MHz 
B)  1.59 kHz 
C)  3.18 kHz 
D)  5.03 kHz

Question 17

-The closed loop gain of the circuit in Figure is

Accepted Answer

A)  12 dB. 
B)  4 dB. 
C)  1.3 dB. 
D)  0 dB. 
A)  12 dB. 
B)  4 dB. 
C)  1.3 dB. 
D)  0 dB.

Question 18

A tuned amplifier has values of f0 = 455 kHz and BW = 5 kHz. What is the value of Q for the circuit?

Accepted Answer

A)  450 
B)  2275 
C)  5 
D)  91 
A)  450 
B)  2275 
C)  5 
D)  91

Question 19

-The filter in Figure has a response curve.

Accepted Answer

A)  Chebyshev 
B)  Butterworth 
C)  Bessel 
D)  band-stop 
A)  Chebyshev 
B)  Butterworth 
C)  Bessel 
D)  band-stop

Question 20

Which type of filter response provides the highest fidelity?

Accepted Answer

A)  Butterworth 
B)  Chebyshev 
C)  Bessel 
A)  Butterworth 
B)  Chebyshev 
C)  Bessel

Exam 17: Tuned Amplifiers

Butterworth active filters are generally preferred over Chebyshev active filters because

The frequency ranges) outside of the bandwidth of a given tuned amplifier is referred to as the

The transistor in a Class C amplifier will conduct for .

-The cutoff frequency for the circuit in Figure is approximately

A bandpass filter has values of f0 = 1.5 MHz and BW = 100 kHz. What is the value of fC2 for the circuit?

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, and RL = 10 kΩ. What is the equivalent parallel resistance for Rw?

A tuned amplifier has values of f0 = 1.3 MHz and Q = 54. What is the bandwidth of the circuit?

-The circuit in Figure is a

The operation of a class C amplifier is based on the

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, and f0 = 1200 Hz. Assuming the load resistance is infinite, what is the circuit bandwidth?

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, and RL = 10 kΩ. What is the quality Q) of the circuit?

-The circuit in Figure is a

A tuned amplifier has the following values: Rw = 50 Ω, XL = 1 kΩ, RL = 10 kΩ and f0 = 1200 Hz. What is the circuit bandwidth?

-The closed-loop gain of the circuit in Figure is

A class C amplifier is being designed to accept a +5 Vpk input. What biasing voltage should be applied to the base of the transistor?

A discrete tuned amplifier has the following values: L = 10 mH, RW = 3 Ω, and C = 0.1 μF. What is the value of f0 for the amplifier?

-The closed loop gain of the circuit in Figure is

A tuned amplifier has values of f0 = 455 kHz and BW = 5 kHz. What is the value of Q for the circuit?

-The filter in Figure has a response curve.

Which type of filter response provides the highest fidelity?

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

Amplifier Frequency Response

Operational Amplifiers

Additional Op-Amp Applications

Oscillators

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters