Question 1

The inherent resonant frequency of a crystal is determined by .

Accepted Answer

A)  the L and C values in the circuit 
B)  the ʺcut of the crystalʺ frequency 
C)  the physical dimensions of the crystal 
D)  All of the above. 
A)  the L and C values in the circuit 
B)  the ʺcut of the crystalʺ frequency 
C)  the physical dimensions of the crystal 
D)  All of the above.

Question 2

A Hartley oscillator has in its feedback network.

Accepted Answer

A)  a pair of tapped capacitors in parallel with an inductor 
B)  a pair of tapped inductors in parallel with a capacitor 
C)  a transformer with a capacitor in parallel with its primary winding 
D)  a pair of tapped capacitors in parallel with an inductor and a third small-value capacitor 
A)  a pair of tapped capacitors in parallel with an inductor 
B)  a pair of tapped inductors in parallel with a capacitor 
C)  a transformer with a capacitor in parallel with its primary winding 
D)  a pair of tapped capacitors in parallel with an inductor and a third small-value capacitor

Question 3

-The circuit in Figure  has the following values: RFC = 100 μH, C1 = 1 μF, and C2 = 33 μF. What is the feedback factor αv) of the circuit?

Accepted Answer

A)  0.03 
B)  33 
C)  0.01 
D)  100 
A)  0.03 
B)  33 
C)  0.01 
D)  100

Question 4

An oscillator has the following values: Av = 188 and α = 0.0048. Which of the following statements is true?

Accepted Answer

A)  The circuit has a constant amplitude output. 
B)  The output from the circuit fades out after several cycles. 
C)  The output from the circuit clips after several cycles. 
D)  None of the above statements are true. 
A)  The circuit has a constant amplitude output. 
B)  The output from the circuit fades out after several cycles. 
C)  The output from the circuit clips after several cycles. 
D)  None of the above statements are true.

Question 5

A 20 MHz crystal is used to produce a 200 MHz oscillator output frequency. This is called operation.

Accepted Answer

A)  resonant mode 
B)  overtone mode 
C)  harmonic mode 
D)  Pierce
Chapter 18 Oscillators Answer Key 
A)  resonant mode 
B)  overtone mode 
C)  harmonic mode 
D)  Pierce
Chapter 18 Oscillators Answer Key

Question 6

-The circuit in Figure  has the following values: RFC = 1 mH, L1 = 100 μH, L2 = 22 μH, and C1 = 0.001 μF. Assuming that the mutual inductance in the circuit is too low to be considered, what is the approximate output frequency of the oscillator?

Accepted Answer

A)  456 kHz 
B)  152 kHz 
C)  503 kHz 
D)  2.2 MhZ 
A)  456 kHz 
B)  152 kHz 
C)  503 kHz 
D)  2.2 MhZ

Question 7

When crystals are exposed to an electric field, they vibrate at a constant rate. This is called .

Accepted Answer

A)  the over tone mode 
B)  the CCO effect 
C)  the piezoelectric effect 
D)  None of the above. 
A)  the over tone mode 
B)  the CCO effect 
C)  the piezoelectric effect 
D)  None of the above.

Question 8

-The circuit in Figure has the following values: RFC = 100 μH, L = 10 μH, C1 = 1 μF, and C2 = 33 μF. What is the output frequency of the circuit?

Accepted Answer

A)  74.5 kHz 
B)  25.6 kHz 
C)  12.8 kHz 
D)  51.1 kHz 
A)  74.5 kHz 
B)  25.6 kHz 
C)  12.8 kHz 
D)  51.1 kHz

Question 9

Which of the following is considered the most durable when manufacturing CCOs?

Accepted Answer

A)  Lead crystal 
B)  Rochell salt 
C)  Quartz 
D)  Tourmaline 
A)  Lead crystal 
B)  Rochell salt 
C)  Quartz 
D)  Tourmaline

Question 10

What type of crystal has the best frequency properties?

Accepted Answer

A)  Lead crystal 
B)  Rochell salt 
C)  Quartz 
D)  Tourmaline 
A)  Lead crystal 
B)  Rochell salt 
C)  Quartz 
D)  Tourmaline

Question 11

-The circuit in Figure  has the following values: RFC = 1mH, L1 = 91 μH, L2 = 20 μH. What is the feedback factor?

Accepted Answer

A)  45.45 
B)  4.55 
C)  0.22 
D)  111 
A)  45.45 
B)  4.55 
C)  0.22 
D)  111

The inherent resonant frequency of a crystal is determined by .

A Hartley oscillator has in its feedback network.

-The circuit in Figure has the following values: RFC = 100 μH, C1 = 1 μF, and C2 = 33 μF. What is the feedback factor αv) of the circuit?

An oscillator has the following values: Av = 188 and α = 0.0048. Which of the following statements is true?

A 20 MHz crystal is used to produce a 200 MHz oscillator output frequency. This is called operation.

-The circuit in Figure has the following values: RFC = 1 mH, L1 = 100 μH, L2 = 22 μH, and C1 = 0.001 μF. Assuming that the mutual inductance in the circuit is too low to be considered, what is the approximate output frequency of the oscillator?

When crystals are exposed to an electric field, they vibrate at a constant rate. This is called .

-The circuit in Figure has the following values: RFC = 100 μH, L = 10 μH, C1 = 1 μF, and C2 = 33 μF. What is the output frequency of the circuit?

Which of the following is considered the most durable when manufacturing CCOs?

What type of crystal has the best frequency properties?

-The circuit in Figure has the following values: RFC = 1mH, L1 = 91 μH, L2 = 20 μH. What is the feedback factor?

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

Tuned Amplifiers

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters

Exam 18: Oscillators

The inherent resonant frequency of a crystal is determined by .

A Hartley oscillator has in its feedback network.

-The circuit in Figure has the following values: RFC = 100 μH, C1 = 1 μF, and C2 = 33 μF. What is the feedback factor αv) of the circuit?

An oscillator has the following values: Av = 188 and α = 0.0048. Which of the following statements is true?

A 20 MHz crystal is used to produce a 200 MHz oscillator output frequency. This is called operation.

-The circuit in Figure has the following values: RFC = 1 mH, L1 = 100 μH, L2 = 22 μH, and C1 = 0.001 μF. Assuming that the mutual inductance in the circuit is too low to be considered, what is the approximate output frequency of the oscillator?

When crystals are exposed to an electric field, they vibrate at a constant rate. This is called .

-The circuit in Figure has the following values: RFC = 100 μH, L = 10 μH, C1 = 1 μF, and C2 = 33 μF. What is the output frequency of the circuit?

Which of the following is considered the most durable when manufacturing CCOs?

What type of crystal has the best frequency properties?

-The circuit in Figure has the following values: RFC = 1mH, L1 = 91 μH, L2 = 20 μH. What is the feedback factor?

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

Tuned Amplifiers

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters