NCIDQ IDFX Practice Exam

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The purpose of a photoelectric beam in area protection is to warn against what?

Sound disturbances
Intrusions through a broken beam
Water damage
Temperature fluctuations

The correct answer is: Intrusions through a broken beam

A photoelectric beam is designed to provide a method of detecting intrusions by using a light beam that, when interrupted, triggers an alert. This interruption can occur when someone or something crosses the path of the beam, which is effective for monitoring perimeters or sensitive areas. When the beam is broken, it signals that there is a potential breach, thus serving as an early warning system against unauthorized access or intrusions. This functionality is paramount in security systems, where quick detection of unauthorized entry is crucial. The other options, while they may highlight various safety concerns, do not relate directly to the primary function of a photoelectric beam in area protection. Sound disturbances, water damage, and temperature fluctuations involve different types of monitoring and reporting mechanisms and do not utilize the beam interruption method that is characteristic of photoelectric systems.