VDV Video Distribution 2

Question 1

What is the primary purpose of a distribution amplifier (DA) in a video system?

Accepted Answer

Split and amplify one signal to multiple outputs without degradation

Answer

A distribution amplifier splits one input signal into multiple isolated outputs while restoring signal strength to compensate for split losses.

Question 2

Which impedance is standard for coaxial video cable used in CCTV and broadcast distribution?

Accepted Answer

75 ohms

Answer

75-ohm coaxial cable is the industry standard for video distribution because it minimizes signal loss at video frequencies.

Question 3

A video signal loses approximately how much level for each 100 feet of RG-59 cable at 3.58 MHz?

Accepted Answer

4 dB

Answer

RG-59 coaxial cable has approximately 4 dB of loss per 100 feet at the color subcarrier frequency of 3.58 MHz.

Question 4

In a star topology video distribution system, what is the main component at the center?

Accepted Answer

Distribution amplifier or matrix switcher

Answer

Star topologies use a central distribution amplifier or matrix switcher to feed each endpoint individually, ensuring equal signal levels.

Question 5

What is the correct termination for an unused output port on a passive video splitter?

Accepted Answer

Install a 75-ohm terminator

Answer

Unterminated ports cause reflections and standing waves; a 75-ohm terminator absorbs the signal and prevents impedance mismatches.

(VDV) Voice Data Video Technician Certified Practice Test