Best way to compare audible alarms

1. Where would an audible alarm be most effective?
2. Which type of alerts will generate an audible alarm?
3. What is audio visual alarm?
4. How does an audible alarm work?

Where would an audible alarm be most effective?

In an enclosed space some of the sound will be reflected and increase the sound level. All-mounted sounder is positioned near a ceiling, more sound will be reflected. The same is true for a ceiling mounted sounder near a wall. A sounder mounted on a wall is more effective than one mounted on a pillar.

Which type of alerts will generate an audible alarm?

Mostly, audible alarms serve to warn of imminent dangers in areas where visual indications cannot be used sufficiently to alert people. Those dangers could be trucks backing up or gates closing.

What is audio visual alarm?

Audio Visual Alarm is used for the purpose of reversing with the guidance of audible and visual indication. In open cast mines while reversing equipment especially; dumpers and tippers, the audio-visual alarm plays a significant role in warning pedestrians.

How does an audible alarm work?

Audible alarms are available in several possible types. Air horns (or airhorns) are operated by compressed air. Sirens, often electrically operated, produce a penetrating warning sound. Bells are hollow metal devices that give off a reverberating sound when struck.