FREE CCTV CCTV Installation and Maintenance Questions and Answers

Question 1

A technician installs an analog HD-over-Coax camera 150 meters from the DVR using RG59 coaxial cable.
The video feed appears distorted with rolling lines and color loss.
What is the most likely cause of this issue?

Accepted Answer

Voltage drop due to excessive cable length.

Answer

Network bandwidth limitations.

Answer

The camera's resolution is too high for the DVR.

Answer

Incorrect BNC connector termination.

Question 2

During a routine maintenance visit for a large outdoor CCTV system, which of the following tasks is MOST critical for ensuring consistent image clarity, especially for cameras housed in protective domes?

Accepted Answer

Cleaning the exterior and interior of the camera dome/housing.

Answer

Verifying the camera's IP address.

Answer

Reformatting the NVR hard drives.

Answer

Updating the camera's firmware.

Question 3

An installer is setting up 50 IP cameras on a dedicated security VLAN that is separate from the main corporate network. To ensure reliable and predictable communication, what is the best practice for assigning IP addresses to the cameras and the NVR?

Accepted Answer

Assign static IP addresses to all cameras and the NVR.

Answer

Use automatic private IP addressing (APIPA).

Answer

Configure all devices to use the corporate DHCP server.

Answer

Use DHCP with an infinite lease time.

Question 4

Which of the following is an essential safety precaution to protect an outdoor PTZ camera and its associated wiring from damage caused by lightning strikes?

Accepted Answer

Installing a properly grounded surge protection device.

Answer

Encasing the camera in a plastic housing.

Answer

Connecting the camera to a Ground Fault Circuit Interrupter (GFCI) outlet.

Answer

Using Shielded Twisted Pair (STP) cable.

Question 5

A user reports that the video from a specific IP camera is intermittently freezing and showing pixelation, while other cameras on the same network switch are working perfectly. The technician has already verified the camera's power supply. What is the next logical step in troubleshooting this issue?

Accepted Answer

Re-terminate the network cable at both the camera and switch ends.

Answer

Increase the camera's video resolution to 4K.

Answer

Replace the Network Video Recorder (NVR).

Answer

Change the system's time using an NTP server.

Question 6

When installing an adjustable or varifocal lens camera, what is the primary purpose of using a focus chart during the final setup?

Accepted Answer

To ensure the camera's image is as sharp and detailed as possible.

Answer

To set the camera's IP address and network configuration.

Answer

To calibrate the camera's Wide Dynamic Range (WDR) settings.

Answer

To measure the maximum cable distance for the camera.

A technician installs an analog HD-over-Coax camera 150 meters from the DVR using RG59 coaxial cable.The video feed appears distorted with rolling lines and color loss.What is the most likely cause of this issue?

A technician installs an analog HD-over-Coax camera 150 meters from the DVR using RG59 coaxial cable.
The video feed appears distorted with rolling lines and color loss.
What is the most likely cause of this issue?