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. A C7 low-voltage contractor must pull a communication cable through the same conduit as a 120V branch circuit. Which NEC section generally prohibits this practice?

    Answer: NEC Article 800.133

    NEC Article 800.133 prohibits communications cables from being installed in the same raceway or conduit as electrical light and power conductors.

  2. What is the primary purpose of a DSP (Digital Signal Processor) in a commercial AV system?

    Answer: To route, mix, equalize, and apply dynamics processing to audio signals

    A DSP performs routing, mixing, EQ, compression, delay, and other real-time processing on audio signals within a single digital domain.

  3. In a structured cabling installation, the maximum total channel length for a permanent link plus patch cords in a Class D (Cat5e) channel is:

    Answer: 100 meters

    TIA-568 specifies a maximum channel length of 100 meters (328 ft) for Class D/Cat5e, including up to 10 meters of patch cords.

  4. A retail store needs background music distributed to 20 ceiling speakers. To maintain consistent volume levels at different distances from the amplifier, the installer should use:

    Answer: A 70-volt distributed audio system with tap transformers

    A 70-volt system with tap transformers allows each speaker to be set to a specific wattage tap, maintaining consistent volume regardless of distance or total speaker count.

  5. Under the California C7 license, which of the following work requires a separate C-10 Electrical Contractor license and CANNOT be performed by a C7 licensee alone?

    Answer: Installing a 120V dedicated outlet for an AV rack

    Line-voltage electrical work such as installing 120V outlets requires a C-10 Electrical Contractor license; C7 licensees are restricted to low-voltage systems.

  6. Which video signal format provides the highest bandwidth and is required for uncompressed 8K video transmission over short distances in professional AV installations?

    Answer: HDMI 2.1 or DisplayPort 2.0

    HDMI 2.1 supports up to 48 Gbps and DisplayPort 2.0 up to 80 Gbps, both capable of carrying uncompressed 8K video signals.

  7. A C7 contractor installing a fire alarm notification speaker system must coordinate with which licensed trade for the initiating devices and control panel connections?

    Answer: C-16 Fire Protection Contractor

    Fire alarm systems in California require a C-16 Fire Protection Contractor license for the overall system; C7 contractors may install speaker wiring but must coordinate panel and device work with a C-16 licensee.