Question 1

What is the purpose of a balanced modulator?

Accepted Answer

A) To produce an output frequency that varies in response to changes in a control voltage. 
B) To change frequency in response to a DC control voltage applied to it. 
C) To allow a range of frequencies to be generated from a stable, single-frequency reference. 
D) To suppress the carrier, leaving only the two sidebands. 
A) To produce an output frequency that varies in response to changes in a control voltage. 
B) To change frequency in response to a DC control voltage applied to it. 
C) To allow a range of frequencies to be generated from a stable, single-frequency reference. 
D) To suppress the carrier, leaving only the two sidebands.

Question 2

A(n)_________ generates a waveform by converting direct-current energy to an alternating current.

Accepted Answer

A) amplifier 
B) synthesizer 
C) oscillator 
D) feedback loop 
A) amplifier 
B) synthesizer 
C) oscillator 
D) feedback loop

Question 3

A crystal oscillator is one that uses a piezoelectric crystal as what type of element of an LC circuit?

Accepted Answer

A) External 
B) Stable 
C) Inductive 
D) Inherent 
A) External 
B) Stable 
C) Inductive 
D) Inherent

Question 4

Which of the following configurations of an LC or RC filter is defined as a sharper transition from passband to stopband than other configurations,but with ripple on both?

Accepted Answer

A) Chebyshev 
B) Cauer 
C) Bessel 
D) Butterworth 
A) Chebyshev 
B) Cauer 
C) Bessel 
D) Butterworth

Question 5

What does the application of two different input frequencies produce?

Accepted Answer

A) Cross products 
B) Power series 
C) Mechanical vibrations 
D) Frequency sensitivity 
A) Cross products 
B) Power series 
C) Mechanical vibrations 
D) Frequency sensitivity

What is the purpose of a balanced modulator?

A(n)_________ generates a waveform by converting direct-current energy to an alternating current.

A crystal oscillator is one that uses a piezoelectric crystal as what type of element of an LC circuit?

Which of the following configurations of an LC or RC filter is defined as a sharper transition from passband to stopband than other configurations,but with ripple on both?

What does the application of two different input frequencies produce?

Fundamental Communications Concept

Amplitude Modulation

Angle Modulation

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters

Exam 4: Communications Circuits

What is the purpose of a balanced modulator?

A(n)_________ generates a waveform by converting direct-current energy to an alternating current.

A crystal oscillator is one that uses a piezoelectric crystal as what type of element of an LC circuit?

Which of the following configurations of an LC or RC filter is defined as a sharper transition from passband to stopband than other configurations,but with ripple on both?

What does the application of two different input frequencies produce?

Fundamental Communications Concept

Amplitude Modulation

Angle Modulation

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters