Question 1

The process of putting information on a carrier wave is called rectification.

Accepted Answer

The process of putting information on a carrier wave is called modulation, not rectification. Rectification is the process of converting an alternating current (AC) to a direct current (DC).

Question 2

A total of three modulated carriers make up the total composite signal.

Accepted Answer

In a composite signal, multiple modulated carriers are combined to form a single signal. Therefore, it is true that a total of three modulated carriers can make up the total composite signal.

Question 3

In television broadcasting, the video image was transmitted by frequency modulation of the carrier.

Accepted Answer

In television broadcasting, the video image is typically transmitted using amplitude modulation of the carrier, while the accompanying sound is transmitted using frequency modulation.

Question 4

When the television system was originally created, it was decided that 4 MHz of bandwidth or spectrum space would be made available for the transmission of television signals on the carrier for each particular station.

Accepted Answer

The original television system allocated 6 MHz of bandwidth for each television channel, not 4 MHz. This bandwidth was chosen to accommodate the video and audio signals necessary for broadcast television.

Question 5

Portions of both the VHF and UHF spectrum space have traditionally been used in analog television broadcasting.

Accepted Answer

Portions of both the VHF and UHF spectrum space have traditionally been used in analog television broadcasting.

Question 6

A virtual channel is a channel designation that differs from the actual assigned channel frequency.

Accepted Answer

A virtual channel is created to make it easier for viewers to find and select channels, even if the actual frequency of the channel changes due to factors such as signal interference.

Question 7

Because digital signals take less spectrum space than analog, multiple signals can be carried simultaneously, even on a virtual channel, through what are called sub-channels.

Accepted Answer

Digital signals are able to carry multiple signals simultaneously through sub-channels due to their efficient use of spectrum space. This is not possible with analog signals, which require more spectrum space to transmit a single signal.

Question 8

Geosynchronous orbit means that a satellite orbits 22 miles above the earth and will appear to stay in a fixed or stationary position.

Accepted Answer

Geosynchronous orbit means that a satellite orbits at an altitude of approximately 22,236 miles above the earth and appears to stay in a fixed or stationary position relative to the earth's surface.

Question 9

Alexander Graham Bell was one of the early modern developers who used light to transmit human speech.

Accepted Answer

Alexander Graham Bell is known for inventing the telephone, which used electrical signals to transmit human speech. However, he also worked on the development of photophones, which used light to transmit speech.

Question 10

Single-mode fiber optic cable uses multiple modes of light simultaneously to carry data.

Accepted Answer

Single-mode fiber optic cable only uses a single mode of light to carry data.

Deck 5: The Transmitted Signal