CCTV CCTV Installation and Maintenance 4

Question 1

What is the primary reason to use shielded twisted pair (STP) cable instead of unshielded (UTP) in a CCTV installation?

Accepted Answer

STP provides greater resistance to electromagnetic interference (EMI)

Answer

STP cable's metallic shield protects signal integrity in environments with high EMI sources such as industrial equipment, fluorescent lighting, or motors.

Question 2

A technician is replacing a failed HDD in an NVR. What should be done before swapping the drive?

Accepted Answer

Power down the NVR and discharge static electricity before handling the drive

Answer

Powering down and grounding yourself (ESD precaution) before handling storage drives prevents data loss and protects both the drive and NVR electronics.

Question 3

Which of the following best describes the difference between DVR and NVR recording systems?

Accepted Answer

DVRs process video from analog cameras; NVRs process video from IP cameras over a network

Answer

A DVR encodes and records video from analog cameras locally, while an NVR records pre-encoded video streams from IP cameras transmitted over a network.

Question 4

What does 'continuous recording' mode mean on a CCTV recorder?

Accepted Answer

The recorder records 24/7 regardless of activity

Answer

Continuous recording mode captures and stores video around the clock without any triggers, ensuring no events are missed but consuming more storage.

Question 5

A camera installed near a bright window consistently produces silhouetted subjects. Which camera setting adjustment would most directly fix this?

Accepted Answer

Enable Backlight Compensation (BLC) or WDR

Answer

Backlight Compensation (BLC) or WDR adjusts exposure to reveal detail in subjects positioned in front of a bright light source.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV CCTV Installation and Maintenance 4