Question 1

A parallel LC circuit has the following values: fr = 424 Hz, L = 5 mH, and Rw = 4 Ω. What is the Q of the circuit?

Accepted Answer

A)  3.33 
B)  3.33 × 10-3 
C)  0.333 
D)  33.3 
A)  3.33 
B)  3.33 × 10-3 
C)  0.333 
D)  33.3

Question 2

A class C amplifier can be used to produce

Accepted Answer

A)  a dc output. 
B)  a triangular waveform. 
C)  harmonics of the input frequency. 
D)  All of the above. 
A)  a dc output. 
B)  a triangular waveform. 
C)  harmonics of the input frequency. 
D)  All of the above.

Question 3

The cutoff frequencies for the filter in Figure are approximately

Accepted Answer

A)  27.4 kHz and 48.6 kHz. 
B)  85.9 kHz and 152.1 kHz. 
C)  32.7 kHz and 43.3 kHz. 
D)  38 kHz and 119 kHz. 
A)  27.4 kHz and 48.6 kHz. 
B)  85.9 kHz and 152.1 kHz. 
C)  32.7 kHz and 43.3 kHz. 
D)  38 kHz and 119 kHz.

Question 4

The voltage gain of an ideal tuned amplifier is reduced to when operated at either cutoff frequency.

Accepted Answer

A)  0 dB 
B)  3 dB 
C)  - ∞ dB zero) 
D)  Avmid) - 3 dB 
A)  0 dB 
B)  3 dB 
C)  - ∞ dB zero) 
D)  Avmid) - 3 dB

Question 5

-The circuit in Figure  is a

Accepted Answer

A)  one-pole low-pass filter. 
B)  two-pole low-pass filter. 
C)  one-pole high-pass filter. 
D)  two-pole high-pass filter. 
A)  one-pole low-pass filter. 
B)  two-pole low-pass filter. 
C)  one-pole high-pass filter. 
D)  two-pole high-pass filter.

Question 6

A tuned amplifier has the following values: f0 = 800 kHz and Q = 1.5. What is the value of fC1 for the circuit?

Accepted Answer

A)  310 kHz 
B)  534 kHz 
C)  577 kHz 
D)  Cannot be determined from the information given. 
A)  310 kHz 
B)  534 kHz 
C)  577 kHz 
D)  Cannot be determined from the information given.

Question 7

In most applications, tuned amplifiers are designed to have

Accepted Answer

A)  the smallest possible bandwidth. 
B)  the largest possible bandwidth. 
C)  a specific bandwidth. 
D)  an unspecified bandwidth. 
A)  the smallest possible bandwidth. 
B)  the largest possible bandwidth. 
C)  a specific bandwidth. 
D)  an unspecified bandwidth.

Question 8

The voltage gain of a practical tuned amplifier is reduced to when operated at either cutoff frequency.

Accepted Answer

A)  0 dB 
B)  3 dB 
C)  - ∞ dB zero) 
D)  Av mid) - 3 dB 
A)  0 dB 
B)  3 dB 
C)  - ∞ dB zero) 
D)  Av mid) - 3 dB

Question 9

The Q of the filter in Figure is approximately

Accepted Answer

A)  11.2. 
B)  3.6. 
C)  0.72. 
D)  5. 
A)  11.2. 
B)  3.6. 
C)  0.72. 
D)  5.

Question 10

-The cutoff frequency for the circuit in Figure is approximately

Accepted Answer

A)  3 Hz. 
B)  72 Hz. 
C)  455 Hz. 
D)  723 Hz. 
A)  3 Hz. 
B)  72 Hz. 
C)  455 Hz. 
D)  723 Hz.

Question 11

A low-pass Sallen-Key two-pole) filter has an upper cutoff frequency of 2 kHz and a Butterworth response curve. The voltage gain of the circuit decreases by approximately if its input frequency increases to 200 kHz.

Accepted Answer

A)  20 dB 
B)  40 dB 
C)  60 dB 
D)  80 dB 
A)  20 dB 
B)  40 dB 
C)  60 dB 
D)  80 dB

Question 12

A class C amplifier is biased

Accepted Answer

A)  at cutoff. 
B)  at saturation. 
C)  deeply into cutoff. 
D)  deeply into saturation. 
A)  at cutoff. 
B)  at saturation. 
C)  deeply into cutoff. 
D)  deeply into saturation.

Question 13

-The center frequency of the circuit in Figure is approximately

Accepted Answer

A)  38 kHz. 
B)  78 kHz. 
C)  119 kHz. 
D)  241 kHz. 
A)  38 kHz. 
B)  78 kHz. 
C)  119 kHz. 
D)  241 kHz.

Question 14

Two amplifiers are operated at the same center frequency f0). Which of the following statements is true?

Accepted Answer

A)  The amplifier with the higher roll-off rate has the wider bandwidth. 
B)  The amplifier with the lower roll-off rate has the wider bandwidth. 
C)  The bandwidth of each circuit is not related of its roll-off rate. 
D)  The bandwidth of each circuit equals the product of its voltage gain and roll -off rate. 
A)  The amplifier with the higher roll-off rate has the wider bandwidth. 
B)  The amplifier with the lower roll-off rate has the wider bandwidth. 
C)  The bandwidth of each circuit is not related of its roll-off rate. 
D)  The bandwidth of each circuit equals the product of its voltage gain and roll -off rate.

A parallel LC circuit has the following values: fr = 424 Hz, L = 5 mH, and Rw = 4 Ω. What is the Q of the circuit?

A class C amplifier can be used to produce

The cutoff frequencies for the filter in Figure are approximately

The voltage gain of an ideal tuned amplifier is reduced to when operated at either cutoff frequency.

-The circuit in Figure is a

A tuned amplifier has the following values: f0 = 800 kHz and Q = 1.5. What is the value of fC1 for the circuit?

In most applications, tuned amplifiers are designed to have

The voltage gain of a practical tuned amplifier is reduced to when operated at either cutoff frequency.

The Q of the filter in Figure is approximately

-The cutoff frequency for the circuit in Figure is approximately

A low-pass Sallen-Key two-pole) filter has an upper cutoff frequency of 2 kHz and a Butterworth response curve. The voltage gain of the circuit decreases by approximately if its input frequency increases to 200 kHz.

A class C amplifier is biased

-The center frequency of the circuit in Figure is approximately

Two amplifiers are operated at the same center frequency f0). Which of the following statements is true?

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

Exam 17: Tuned Amplifiers

A parallel LC circuit has the following values: fr = 424 Hz, L = 5 mH, and Rw = 4 Ω. What is the Q of the circuit?

A class C amplifier can be used to produce

The cutoff frequencies for the filter in Figure are approximately

The voltage gain of an ideal tuned amplifier is reduced to when operated at either cutoff frequency.

-The circuit in Figure is a

A tuned amplifier has the following values: f0 = 800 kHz and Q = 1.5. What is the value of fC1 for the circuit?

In most applications, tuned amplifiers are designed to have

The voltage gain of a practical tuned amplifier is reduced to when operated at either cutoff frequency.

The Q of the filter in Figure is approximately

-The cutoff frequency for the circuit in Figure is approximately

A low-pass Sallen-Key two-pole) filter has an upper cutoff frequency of 2 kHz and a Butterworth response curve. The voltage gain of the circuit decreases by approximately if its input frequency increases to 200 kHz.

A class C amplifier is biased

-The center frequency of the circuit in Figure is approximately

Two amplifiers are operated at the same center frequency f0). Which of the following statements is true?

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