Knowledge 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 Knowledge flashcards as text
What is the key difference between a DVR and an NVR in a CCTV system?
Answer: A DVR processes analog signals locally, while an NVR processes digital IP streams from network cameras
A DVR (Digital Video Recorder) encodes analog signals from traditional cameras, whereas an NVR (Network Video Recorder) records digital video streams from IP cameras over a network.
Which lighting condition is IR (infrared) illumination designed to overcome?
Answer: Complete or near-total darkness where visible light is insufficient
IR illuminators emit infrared light invisible to the human eye, allowing CCTV cameras with IR-sensitive sensors to capture images in total darkness.
In CCTV system design, what does 'pixel density' determine?
Answer: How much detail can be resolved in a given area of the image, affecting identification capability
Pixel density (often measured in pixels per meter or PPM) determines image detail and is critical for achieving detection, recognition, or identification levels per surveillance standards.
What is the purpose of PoE (Power over Ethernet) in IP camera installations?
Answer: To deliver both data and electrical power to the camera over a single Ethernet cable
PoE technology allows a single Cat5e/Cat6 cable to carry both the network data stream and the electrical power needed to operate an IP camera, simplifying installation.
What is meant by 'frame rate' in CCTV video recording?
Answer: The number of individual images captured and displayed per second, measured in fps
Frame rate, measured in frames per second (fps), determines how smooth the recorded video appears; higher frame rates capture faster motion more accurately.
Which compression standard offers the most efficient compression for IP cameras while maintaining high image quality?
Answer: H.265 (HEVC)
H.265 (also called HEVC) provides approximately 50% better compression efficiency than H.264, significantly reducing storage and bandwidth requirements without sacrificing image quality.
In the context of CCTV, what is a 'looping output' on a camera or monitor?
Answer: A secondary video output that passes the video signal through to another device without amplification loss
A looping output allows a camera's video signal to pass through to another monitor or device in the chain, enabling the same signal to feed multiple destinations.