CCTV System Components 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 System Components flashcards as text
What is the purpose of a 'sync generator' in a legacy analog CCTV system?
Answer: Provide a common timing reference signal so multiple cameras stay synchronized for multiplexed recording
A sync generator produces a master reference signal that locks multiple analog cameras to the same timing, preventing frame tearing or rolling when cameras are switched or multiplexed.
A technician needs to run CCTV cable through a high-EMI industrial environment. Which cable type is most appropriate?
Answer: Single-mode fiber optic cable
Single-mode fiber optic cable transmits light signals, making it completely immune to electromagnetic interference — the best choice for high-EMI environments like factories with large motors.
What does the term 'back focus adjustment' refer to in a CCTV camera?
Answer: Setting the correct distance between the lens and the image sensor to achieve sharp focus
Back focus adjustment positions the image sensor (or CCD/CMOS chip) at the correct focal distance from the lens so the image remains sharp across the full zoom range.
In a CCTV installation, what is the purpose of a 'termination resistor' (75-ohm) at the end of a coaxial video run?
Answer: Prevent signal reflections by matching the cable's characteristic impedance
A 75-ohm termination resistor at the end of a coaxial cable absorbs the signal and prevents it from reflecting back, which would cause ghost images or signal distortion.
What is the function of an OSD (On-Screen Display) menu in a CCTV camera?
Answer: Allow configuration of camera settings such as exposure, white balance, and motion detection via an on-screen interface
The OSD menu is accessed through the camera's joystick or software interface and lets technicians configure internal camera parameters without needing a separate software application.
Which CCTV camera technology uses a coaxial cable to transmit HD video without converting to IP, maintaining analog infrastructure?
Answer: HD-TVI, HD-CVI, or AHD (analog HD over coax)
HD-TVI, HD-CVI, and AHD are analog HD-over-coax technologies that transmit 1080p or higher resolution video over existing RG-59/RG-6 coaxial cable without requiring IP network infrastructure.
What is the primary purpose of a CCTV 'video wall controller' in a large security control room?
Answer: Manage and distribute multiple video sources across an array of monitors in flexible display layouts
A video wall controller receives multiple video inputs and outputs them across an array of monitors, allowing operators to create custom layouts, zoom in on specific feeds, and manage large-scale surveillance displays.