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

The camera's refresh rate in frames per second

Answer

The distance between the camera and the subject

Answer

The sensitivity to infrared light

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

It eliminates the need for IR illuminators

Answer

It provides higher frame rates than fixed lenses

Answer

It reduces the need for video compression

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

Dome housing

Answer

Bullet housing

Answer

Box housing with sunshield

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

The number of supported video streams

Answer

The frame rate relative to bandwidth usage

Answer

The ratio of IR to visible light sensitivity

Question 5

In CCTV, what is 'depth of field'?

Accepted Answer

The range of distances within a scene that appear acceptably sharp

Answer

The maximum recording duration of a storage system

Answer

The vertical tilt range of a PTZ camera

Answer

The latency between capture and display

Question 6

What is a key characteristic of a 'pinhole' camera lens used in CCTV?

Accepted Answer

Very small front aperture allowing discreet concealed installation

Answer

Extremely wide field of view exceeding 180 degrees

Answer

High zoom capability for long-range surveillance

Answer

Built-in audio recording microphone