CST CCTV Camera Selection & Placement 3

Question 1

What is the primary purpose of a camera's IR cut filter (ICR)?

Accepted Answer

To physically switch between day and night modes for accurate color rendering

Answer

The ICR mechanically moves a filter in front of the sensor, blocking infrared in daylight for true color and removing it at night for better low-light sensitivity.

Question 2

For perimeter detection along a fence line, which camera configuration provides the most effective coverage?

Accepted Answer

Multiple narrow field-of-view cameras spaced along the fence

Answer

Spacing multiple narrow FOV cameras along the fence creates overlapping coverage zones with enough detail to detect intruders at every point.

Question 3

Which specification indicates a camera's ability to produce usable images in extremely low ambient light without supplemental illumination?

Accepted Answer

Low lux rating

Answer

A low lux rating indicates the minimum light level at which the camera can still produce a usable image, with lower values meaning better low-light performance.

Question 4

What placement consideration is critical when installing cameras to monitor ATM machines?

Accepted Answer

Camera must be mounted above and behind the user to capture the face

Answer

Mounting the camera above and behind the user captures the face during the transaction while avoiding obstruction of the keypad view by the user's body.

Question 5

A camera's horizontal field of view is 90°. If placed in a corridor 10 feet wide, approximately how far from the camera will the image cover the full corridor width?

Accepted Answer

5 feet

Answer

With a 90° horizontal FOV, the half-angle is 45°, so the image width equals the distance from the camera; a 10-foot-wide corridor is fully covered at 5 feet.

(CST) Certified Surveillance Technician Practice Test

(CST) Certified Surveillance Technician Practice Test

CST CCTV Camera Selection & Placement 3