CCTV CCTV System Components 4

Question 1

What is the purpose of an 'IR cut filter' (ICR) in a CCTV camera?

Accepted Answer

Automatically switch between blocking and passing infrared light depending on lighting conditions

Answer

An ICR mechanically moves an IR-cut filter in front of the sensor during daylight for accurate color reproduction and removes it at night to allow IR light to enhance low-light sensitivity.

Question 2

A technician installs a video balun on a CCTV system. What problem does this device solve?

Accepted Answer

It allows transmission of video over unshielded twisted pair (UTP) cable instead of coaxial cable

Answer

A video balun converts the impedance of an analog video signal so it can be carried over inexpensive Cat5/Cat6 UTP cable instead of coaxial cable.

Question 3

What is the significance of a camera's 'minimum illumination' specification?

Accepted Answer

The lowest light level at which the camera can still produce a usable image

Answer

Minimum illumination specifies the lowest light level (in lux or lux-equivalent) at which the camera can capture a recognizable image, indicating its low-light capability.

Question 4

In an analog CCTV system, what does a 'video distribution amplifier' (VDA) do?

Accepted Answer

Splits one video signal into multiple identical outputs while maintaining signal strength

Answer

A VDA takes a single analog video input and distributes it to multiple outputs simultaneously, buffering each output to prevent signal degradation from splitting.

Question 5

Which camera form factor is most suitable for discreet indoor surveillance where the camera should be nearly invisible?

Accepted Answer

Pinhole camera

Answer

Pinhole cameras use an extremely small lens opening that can be concealed behind a tiny hole in a wall, ceiling tile, or everyday object, making them nearly undetectable.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV CCTV System Components 4