CCTV CCTV Installation and Maintenance 2 — Questions and Answers
Question 1: When mounting a dome camera on a suspended ceiling, which hardware is most appropriate?
- Standard wood screws
- Pendant mount with ceiling adapter (Correct answer)
- Adhesive mounting tape
- Plastic drywall anchors
Correct answer: Pendant mount with ceiling adapter
A pendant mount with ceiling adapter provides the structural support and proper angle adjustment needed for suspended ceiling installations.
Question 2: What does the term 'IP66' rating indicate on a CCTV camera enclosure?
- The camera supports 66 simultaneous IP streams
- The enclosure is dust-tight and protected against powerful water jets (Correct answer)
- The camera operates at 66 frames per second
- The device uses IPv6 networking protocol
Correct answer: The enclosure is dust-tight and protected against powerful water jets
IP66 means the enclosure is completely dust-tight (6) and protected against powerful water jets from any direction (6).
Question 3: A technician notices video signal degradation over a long coaxial cable run. Which device should be installed to correct this?
- Video splitter
- Video distribution amplifier
- Video balun
- In-line video amplifier (Correct answer)
Correct answer: In-line video amplifier
An in-line video amplifier boosts the signal strength to compensate for attenuation over long coaxial cable runs.
Question 4: What is the recommended minimum overlap percentage when planning multiple camera fields of view for complete coverage?
- 5%
- 10%
- 20% (Correct answer)
- 50%
Correct answer: 20%
A 20% overlap between adjacent camera views ensures there are no blind spots and provides redundancy at coverage boundaries.
Question 5: Which cable type is preferred for PTZ camera control signals over long distances?
- RG-59 coaxial
- Cat5e twisted pair
- RS-485 twisted pair (Correct answer)
- Fiber optic
Correct answer: RS-485 twisted pair
RS-485 twisted pair cable is the standard for PTZ control signals because it supports long-distance, noise-resistant differential signaling.
Question 6: During a CCTV system walkthrough, a customer reports that nighttime footage appears very grainy. What is the most likely cause?
- Excessive frame rate setting
- Insufficient IR illumination range (Correct answer)
- Incorrect video codec selection
- Oversized sensor resolution
Correct answer: Insufficient IR illumination range
Grainy nighttime footage typically indicates the camera's built-in IR LEDs do not reach the required distance, leaving the scene underexposed.
Question 7: What is the purpose of using conduit when running CCTV cabling through a commercial building?
- To increase cable bandwidth
- To protect cables from physical damage and provide a clean installation (Correct answer)
- To reduce electromagnetic interference only
- To allow wireless signal transmission
Correct answer: To protect cables from physical damage and provide a clean installation
Conduit protects cables from physical damage, rodents, and moisture while also providing a professional, code-compliant installation.
CCTV CCTV Installation and Maintenance 2
When mounting a dome camera on a suspended ceiling, which hardware is most appropriate?