Systems & Equipment Flashcards
9 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 9 Systems & Equipment flashcards as text
What is the primary function of a CCTV camera?
Answer: To monitor and record for security purposes
The primary function of a CCTV (Closed-Circuit Television) camera is to provide surveillance by monitoring specific areas and recording video footage. These cameras are widely used in security systems to deter crime, identify intruders, and gather evidence for investigations. Their purpose is to enhance safety and security by providing continuous visual oversight of premises.
Why is it important to choose the correct lens for a CCTV camera?
Answer: To ensure the camera captures the correct area of interest
Choosing the correct lens for a CCTV camera is critical because the lens determines the camera's field of view, focal length, and depth of field. A suitable lens ensures that the camera captures the specific area of interest with the desired level of detail and coverage. An incorrect lens might result in a too narrow or too wide view, missing crucial details or failing to cover the necessary surveillance zone effectively.
What is the purpose of a DVR (Digital Video Recorder) in a CCTV system?
Answer: To record, store, and retrieve video footage
A DVR (Digital Video Recorder) is a core component of an analog CCTV system. Its primary function is to receive video feeds from cameras, digitally record them onto a hard drive, and provide tools for storing, searching, and playing back the footage. This allows for post-incident review, evidence collection, and continuous monitoring over time.
Why is it necessary to adjust the camera angle in a CCTV system?
Answer: To ensure the correct area is monitored
Adjusting the camera angle is crucial for effective surveillance. It ensures that the camera's field of view precisely covers the intended area of interest, maximizing coverage and eliminating blind spots. Proper angling is essential to capture relevant events and maintain the security system's integrity.
What does PTZ stand for in CCTV systems?
Answer: Pan-Tilt-Zoom
PTZ is an acronym that stands for Pan-Tilt-Zoom. These terms describe the three primary movements or functions of a specific type of surveillance camera. 'Pan' refers to horizontal rotation, 'Tilt' refers to vertical movement, and 'Zoom' refers to the ability to adjust the lens for magnification, allowing operators dynamic control over the camera's view.
Why is remote access to CCTV systems beneficial?
Answer: It allows monitoring and control from anywhere
Remote access to CCTV systems offers significant benefits by allowing authorized users to monitor live or recorded video footage and sometimes control cameras from any location with an internet connection. This capability enhances flexibility, enables quick response to incidents, and provides continuous oversight even when personnel are not physically on-site.
What is the role of a motion detector in a CCTV system?
Answer: To detect movement and trigger recording
The role of a motion detector in a CCTV system is to sense movement within the camera's field of view. Upon detecting motion, it triggers the system to begin recording, send alerts, or activate other security protocols. This feature helps conserve storage space by only recording relevant events and draws attention to potential security incidents.
What is the difference between analog and digital CCTV systems?
Answer: Analog systems are less expensive but offer lower quality than digital systems
Analog CCTV systems transmit video over coaxial cables, typically offering lower resolution and being less expensive to install. In contrast, digital (IP) systems transmit data over networks, providing significantly higher video quality, greater scalability, and more advanced features. This makes analog systems a more budget-friendly option but with a trade-off in image fidelity compared to digital systems.
What is the purpose of using infrared technology in CCTV cameras?
Answer: To capture video in low or no-light conditions
Infrared (IR) technology is integrated into CCTV cameras to provide night vision capabilities. IR illuminators emit infrared light, which is invisible to the human eye but detectable by the camera's sensor. This enables the camera to capture clear images and video in low-light or complete darkness, ensuring 24/7 surveillance.