Practice Test Geeks(C7) California C7 Low Voltage Systems Contractor Certification Practice Test
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C7 Audio Visual & Communication Systems Flashcards

7 cards from real C7 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 C7 Audio Visual & Communication Systems flashcards as text

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

    Answer: Either A or B as long as both ends match

    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.

  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?

    Answer: 70 meters

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

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

    Answer: An auto-off timer when the space is unoccupied

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

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

    Answer: 70.7 volts nominal, transformer-matched

    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.

  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?

    Answer: 45 days

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

  6. When installing ceiling speakers in a plenum space without conduit, the audio cable must be rated as:

    Answer: CMP (plenum-rated)

    Cables run in air-handling plenums must be CMP-rated (plenum) to meet NEC Article 800 fire and smoke propagation requirements.

  7. An AV technician is troubleshooting a ground loop hum in a balanced XLR audio system. The most effective first corrective step is to:

    Answer: Insert a 1:1 isolation transformer on the affected run

    An audio isolation transformer breaks the DC ground path while passing the audio signal, eliminating ground loop–induced hum without degrading signal quality.