CST CCTV Camera Selection & Placement 2 — Questions and Answers
Question 1: Which camera type is best suited for monitoring a large open parking lot with varying light conditions throughout the day?
- Fixed focal length dome camera
- Wide dynamic range (WDR) PTZ camera (Correct answer)
- Standard analog bullet camera
- Pinhole covert camera
Correct answer: Wide dynamic range (WDR) PTZ camera
A WDR PTZ camera handles high-contrast lighting and can pan to cover a large parking lot area effectively.
Question 2: What is the minimum recommended camera resolution for capturing license plate numbers at a distance of 50 feet?
- D1 (720x480)
- 720p HD
- 1080p Full HD (Correct answer)
- 4K Ultra HD
Correct answer: 1080p Full HD
1080p Full HD provides sufficient pixel density to resolve license plate characters at distances up to approximately 50 feet.
Question 3: A camera mounted at a corner of a building needs to cover two adjacent sides. Which lens type is most appropriate?
- Telephoto lens
- Wide-angle lens (Correct answer)
- Narrow field-of-view lens
- Pinhole lens
Correct answer: Wide-angle lens
A wide-angle lens provides a broader field of view, allowing a single corner-mounted camera to cover two adjacent building sides.
Question 4: When selecting cameras for an indoor retail environment, which feature is most important to prevent blind spots near shelving units?
- Infrared illumination
- Varifocal lens with wide minimum angle (Correct answer)
- High frame rate capability
- PoE compatibility
Correct answer: Varifocal lens with wide minimum angle
A varifocal lens with a wide minimum angle lets the installer adjust the field of view to eliminate blind spots around shelving.
Question 5: What camera placement height is generally recommended for facial recognition applications in a standard-height interior corridor?
- 6–7 feet (Correct answer)
- 9–10 feet
- 12–14 feet
- 15+ feet
Correct answer: 6–7 feet
Mounting cameras at 6–7 feet places the lens near face level, producing the optimal downward angle for facial recognition without excessive distortion.
Question 6: Which type of camera housing is required when installing surveillance cameras in a food processing facility?
- Standard plastic dome
- IP66-rated metal housing
- NEMA 4X stainless steel housing (Correct answer)
- Indoor surface-mount box
Correct answer: NEMA 4X stainless steel housing
NEMA 4X stainless steel housings resist corrosion and can withstand high-pressure washdowns common in food processing environments.
Question 7: A site survey reveals strong backlight from windows in a lobby. Which camera feature directly addresses this challenge?
- Digital noise reduction (DNR)
- Wide dynamic range (WDR) (Correct answer)
- Optical zoom
- Mechanical IR cut filter
Correct answer: Wide dynamic range (WDR)
WDR technology simultaneously captures bright and dark areas of a scene, compensating for the intense backlight from lobby windows.
CST CCTV Camera Selection & Placement 2
Which camera type is best suited for monitoring a large open parking lot with varying light conditions throughout the day?