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CCTV Installation and Maintenance Flashcards

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

Read the first 7 CCTV Installation and Maintenance flashcards as text

  1. What is the primary reason to use shielded twisted pair (STP) cable instead of unshielded (UTP) in a CCTV installation?

    Answer: STP provides greater resistance to electromagnetic interference (EMI)

    STP cable's metallic shield protects signal integrity in environments with high EMI sources such as industrial equipment, fluorescent lighting, or motors.

  2. A technician is replacing a failed HDD in an NVR. What should be done before swapping the drive?

    Answer: Power down the NVR and discharge static electricity before handling the drive

    Powering down and grounding yourself (ESD precaution) before handling storage drives prevents data loss and protects both the drive and NVR electronics.

  3. Which of the following best describes the difference between DVR and NVR recording systems?

    Answer: DVRs process video from analog cameras; NVRs process video from IP cameras over a network

    A DVR encodes and records video from analog cameras locally, while an NVR records pre-encoded video streams from IP cameras transmitted over a network.

  4. What does 'continuous recording' mode mean on a CCTV recorder?

    Answer: The recorder records 24/7 regardless of activity

    Continuous recording mode captures and stores video around the clock without any triggers, ensuring no events are missed but consuming more storage.

  5. A camera installed near a bright window consistently produces silhouetted subjects. Which camera setting adjustment would most directly fix this?

    Answer: Enable Backlight Compensation (BLC) or WDR

    Backlight Compensation (BLC) or WDR adjusts exposure to reveal detail in subjects positioned in front of a bright light source.

  6. What is the typical function of a video balun in CCTV systems?

    Answer: To transmit video signals over twisted pair cable instead of coaxial cable

    A video balun converts the impedance of coaxial video to allow transmission over standard twisted pair (Cat5/Cat6) cable, enabling longer or more flexible cable runs.

  7. When reviewing a site survey for a new CCTV installation, which environmental factor most affects the choice between a fixed and PTZ camera?

    Answer: The size of the area to be monitored and whether active tracking is needed

    Large open areas that require active operator tracking or wide coverage justify a PTZ camera, while fixed cameras suit defined, static fields of view.