C7 C7 Audio Visual & Communication Systems 4

Question 1

When terminating a Cat6 cable for a VoIP phone system, which wiring standard is most commonly specified in commercial California installations?

Accepted Answer

Either A or B as long as both ends match

Answer

Both TIA-568-A and TIA-568-B are acceptable; the critical requirement is that both ends of the cable use the same standard to maintain continuity.

Question 2

A conference room AV system requires 4K video distribution over HDBaseT. What is the maximum recommended cable run length for HDBaseT at 4K/60Hz with 4:4:4 color?

Accepted Answer

70 meters

Answer

HDBaseT at 4K/60Hz with 4:4:4 chroma sampling is limited to approximately 70 meters over Cat6A cable.

Question 3

Under California's Title 24 energy code, an automatically controlled commercial audio system must include which feature?

Accepted Answer

An auto-off timer when the space is unoccupied

Answer

Title 24 requires commercial AV systems to have automatic shutoff controls that turn off equipment when the space is unoccupied.

Question 4

Which impedance is standard for a distributed 70-volt speaker system used in commercial paging applications?

Accepted Answer

70.7 volts nominal, transformer-matched

Answer

70-volt systems use step-up/step-down transformers at each speaker to match impedance, allowing many speakers on a single amplifier output without complex parallel calculations.

Question 5

A C7 contractor is installing a video surveillance system that stores footage locally. Under California law, what is the minimum retention period typically required for recorded footage in a licensed cannabis retail facility?

Accepted Answer

45 days

Answer

California DCC regulations require cannabis licensees to retain surveillance video footage for a minimum of 45 calendar days.

(C7) California C7 Low Voltage Systems Contractor Certification Practice Test

(C7) California C7 Low Voltage Systems Contractor Certification Practice Test

C7 C7 Audio Visual & Communication Systems 4