CCTV CCTV Camera Technology and Optics 3

Question 1

What does 'resolution' measure in the context of CCTV cameras?

Accepted Answer

The number of pixels used to form an image

Answer

Resolution refers to the number of pixels (horizontal × vertical) that make up a captured image, directly affecting image clarity and detail.

Question 2

What is the main benefit of using a motorized zoom lens in a CCTV system?

Accepted Answer

It allows remote focal length adjustment without physical access to the camera

Answer

Motorized zoom lenses can be adjusted remotely via the VMS or control system, eliminating the need for physical access to the camera after installation.

Question 3

Which camera housing type is specifically designed to protect cameras from vandalism in public areas?

Accepted Answer

Vandal-resistant dome housing (IK10-rated)

Answer

Vandal-resistant dome cameras with IK10 rating are built to withstand physical attacks, making them suitable for high-risk public environments.

Question 4

What does SNR (Signal-to-Noise Ratio) measure in CCTV cameras?

Accepted Answer

The ratio of useful video signal to background electronic noise

Answer

SNR measures the ratio of the desired video signal to unwanted electronic noise; a higher SNR (measured in dB) produces cleaner, clearer images.

Question 5

In CCTV, what is 'depth of field'?

Accepted Answer

The range of distances within a scene that appear acceptably sharp

Answer

Depth of field is the range of distances from the camera within which objects in the scene appear in acceptable focus.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV CCTV Camera Technology and Optics 3