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 primary function of a Digital Video Recorder (DVR) in a CCTV system?
Answer: Convert and store analog camera footage as digital video
A DVR converts analog video signals from cameras into digital format and stores them on a hard drive for later retrieval.
Which connector type is most commonly used to connect coaxial cables to analog CCTV cameras?
Answer: BNC
BNC (Bayonet Neill-Concelman) connectors are the industry standard for connecting coaxial cables to analog CCTV cameras and DVRs.
A Network Video Recorder (NVR) differs from a DVR primarily because it:
Answer: Receives pre-encoded digital video streams over a network
An NVR receives already-encoded digital video from IP cameras over an Ethernet network, whereas a DVR encodes incoming analog signals itself.
What does the term 'varifocal lens' mean in the context of CCTV cameras?
Answer: The focal length can be manually adjusted while maintaining focus
A varifocal lens allows the operator to manually adjust the focal length (zoom level) and then refocus, providing flexibility for different fields of view.
Which type of CCTV housing is rated for outdoor use and protects against weather, dust, and moisture?
Answer: IP66-rated enclosure
An IP66-rated enclosure is dust-tight and protected against powerful water jets, making it suitable for outdoor CCTV installations.
In a CCTV system, what is the purpose of a video multiplexer?
Answer: Display and record multiple camera feeds on a single recording device simultaneously
A video multiplexer combines multiple camera inputs so they can all be displayed and recorded simultaneously on a single monitor or recording device.
What is the function of a PoE (Power over Ethernet) switch in an IP camera CCTV system?
Answer: Supply both data connectivity and electrical power through a single Ethernet cable to IP cameras
A PoE switch delivers both network data and DC power to IP cameras over a single Cat5e/Cat6 Ethernet cable, eliminating the need for separate power supplies.