CCTV Camera Selection & Placement Flashcards
7 cards from real CST 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 Camera Selection & Placement flashcards as text
Which camera technology is best suited for detecting human presence through complete darkness and smoke in an industrial environment?
Answer: Thermal imaging camera
Thermal cameras detect heat signatures rather than visible or near-IR light, making them effective through complete darkness, smoke, and dust.
When selecting a varifocal camera for a new installation where exact zoom requirements are uncertain, what is the primary benefit over a fixed focal length camera?
Answer: Ability to mechanically adjust the field of view after installation
Varifocal lenses allow the installer to adjust focal length during or after installation, accommodating uncertainties in the required field of view without replacing the camera.
A camera positioned to monitor a server room door must capture both the keypad area and the person using it. What is the ideal mounting position?
Answer: On the opposite wall at face height, angled toward the door
Mounting on the opposite wall at face height provides a clear frontal view of the person's face as they approach and use the keypad.
What does the pixel per foot (PPF) metric measure in surveillance system design?
Answer: The image detail available at a specific distance from the camera
PPF quantifies how many pixels are available to represent one foot of the scene at a specific distance, directly determining the level of detail captured.
In a high-security environment, overlapping camera fields of view are required. What is the primary security benefit of this design?
Answer: Eliminates blind spots and provides multiple vantage points for any incident
Overlapping fields of view ensure no location exists where someone can act without being captured by at least one camera, and provide multiple angles for investigation.
What is the effect of increasing a camera's iris aperture (lower f-number) in a low-light environment?
Answer: Brightens the image but reduces depth of field
A wider aperture (lower f-number) admits more light, improving low-light performance, but it also reduces the depth of field, narrowing the zone of acceptable focus.
Which mounting configuration is recommended to minimize camera vandalism in a high-risk public space?
Answer: Recessed ceiling dome with IK10 rating mounted above 10 feet
A recessed IK10-rated dome mounted above 10 feet combines impact resistance with placement out of easy reach, significantly reducing successful vandalism attempts.