In an optical fiber, the inner core is _______ the cladding.

In an optical fiber, the inner core is _______ the cladding. a. darker than b. denser than c. the same density as d. less dense than Answer:...

________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single communication link.

________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single communication link. a. Multiplexing b....

_______ are used for cellular phone, satellite, and wireless LAN communications.

_______ are used for cellular phone, satellite, and wireless LAN communications. a. Ultraviolet Waves b. Radio waves c. Infrared waves d. Microwaves Answer:...

____ is designed to use the high bandwidth capability of fiber-optic cable.

____ is designed to use the high bandwidth capability of fiber-optic cable. a. WDM b. TDM c. FDM d. PDM Answer: ...

If we have a ______ channel, we can send more than one ______ signals simultaneously through the channel using a broadband transmission technique.

If we have a ______ channel, we can send more than one ______ signals simultaneously through the channel using a broadband transmission technique. a....

What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?

What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz? a. 3 MHz b. 1 MHz c. 1 KHz d. 4 MHz Answer: ...

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the data signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the data signal changes, the frequency of the carrier changes correspondingly.

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the data signal. The peak...

If the baud rate is 400 for a 8-QAM (i.e., uses 8 different signal levels) signal, the bit rate is ________ bps.

If the baud rate is 400 for a 8-QAM (i.e., uses 8 different signal levels) signal, the bit rate is ________ bps. a. 800 b. 1200 c. 400 d. 100 Answer:...

Which multiplexing technique modulates each signal to a different carrier frequency?

Which multiplexing technique modulates each signal to a different carrier frequency? a. WDM (Wavelength Division Multiplexing) b. TDM (Time Division...

A parabolic dish antenna is a(n) _______ antenna.

A parabolic dish antenna is a(n) _______ antenna. a. omnidirectional b. horn c. unidirectional d. bidirectional Answer: ...

______ is a digital process that allows several digital signals to share a high bandwidth link.

______ is a digital process that allows several digital signals to share a high bandwidth link.  a. FDM Frequency Division Multiplexing) b....

Microwaves are _________ than low-frequency radio waves.

Microwaves are _________ than low-frequency radio waves. a. more directional b. more propogating c. more periodic d. more radiating Answer:...

Radio and microwave signals with a low-end frequency (below 2MHz) use _______ propagation.

Radio and microwave signals with a low-end frequency (below 2MHz) use _______ propagation. a. Line-of-sight b. Switched c. Ground d. Sky Answer:...

Amplitude shift keying (ASK), Phase shift keying (PSK), frequency shift keying (FSK) and quadrature amplitude modulation (QAM) are examples of ________ conversion.

Amplitude shift keying (ASK), Phase shift keying (PSK), frequency shift keying (FSK) and quadrature amplitude modulation (QAM) are examples of ________...

Which of the following is not a digital-to-analog conversion?

Which of the following is not a digital-to-analog conversion? a. Pulse Amplitude Modulation (PAM) b. Phase Shift Keying (PSK) c. Quadrature Amplitude...

A periodic signal completes one cycle in 0.001 second. What is the frequency?

A periodic signal completes one cycle in 0.001 second. What is the frequency?  a. 100 Hz b. 1 Hz c. 1 MHz d. 1 KHz Answer: ...

_______ signals can have an infinite number of values in a range?

_______ signals can have an infinite number of values in a range? a. Analog b. Binary c. Both analog and digital d. Digital Answer:...

As frequency increases, the period ______?

As frequency increases, the period ______? a. increases b. doubles c. decreases d. remains the same Answer: ...

Radio waves used for conventional TV and AM/FM radios are _______.

Radio waves used for conventional TV and AM/FM radios are _______. a. omnidirectional b. unidirectional c. bidirectional d. synchronous Answer:...

A(n) _____ medium provides a physical conduit from one device to another.

A(n) _____ medium provides a physical conduit from one device to another. a. radiating b. unguided c. wireless d. guided Answer: ...

_______ cable consists of multiple pairs of insulated copper wires twisted together?

_______ cable consists of multiple pairs of insulated copper wires twisted together?  a. USB b. Coaxial c. Twisted pair d. Fiber-Optic Answer:...

Which of the following communication systems primarily uses guided media?

Which of the following communication systems primarily uses guided media? a. Local telephone system b. radio broadcasting c. Cellular telephone...

_______ is an analog multiplexing technique to combine optical signals.

_______ is an analog multiplexing technique to combine optical signals.  a. TDM (Time Division Multiplexing) b. FDM (Frequency Division Multiplexing) c....

Baseband transmission of a digital signal is possible only if we have a ____ channel.

Baseband transmission of a digital signal is possible only if we have a ____ channel. a. band-pass b. narrowband c. low-pass d. broadband Answer:...

Quadrature amplitude modulation (QAM) is a combination of ___________.

Quadrature amplitude modulation (QAM) is a combination of ___________. a. pulse amplitude modualation (PAM) and phase modulation (PM) b. pulse amplitude...

________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.

________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. a. Attenuation b. Noise c. Distortion d....

A sine wave is _______?

A sine wave is _______? a. aperiodic and discrete b. periodic and continuous c. periodic and discrete d. aperiodic and continuous Answer:...

16QAM encodes 4 bits per Symbol. 4000/4 =

16QAM encodes 4 bits per Symbol. 4000/4 =  Answer: 1000 ba...

If the bit rate for a 16-QAM (i.e., uses 16 different signal levels) signal is 4000 bps, what is the baud rate?

If the bit rate for a 16-QAM (i.e., uses 16 different signal levels) signal is 4000 bps, what is the baud rate? a. 400 b. 1200 c. 1000 d. 300 Answer:...