Which of the following is a correct alarm modality combination for the detector?

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Multiple Choice

Which of the following is a correct alarm modality combination for the detector?

Explanation:
Alarms should be detectable through multiple channels to guarantee workers notice them in a noisy, dark, or PPE-blocked environment. Using audible, visual, and vibration together provides redundancy: you’ll hear the alert, see it, and feel it, which is crucial underground where conditions can mask a single signal. The combination that includes all three modalities is therefore the most reliable choice, since relying on just one or two (like flashing light alone or audible plus visual) can miss someone under noise, dust, or protective gear.

Alarms should be detectable through multiple channels to guarantee workers notice them in a noisy, dark, or PPE-blocked environment. Using audible, visual, and vibration together provides redundancy: you’ll hear the alert, see it, and feel it, which is crucial underground where conditions can mask a single signal. The combination that includes all three modalities is therefore the most reliable choice, since relying on just one or two (like flashing light alone or audible plus visual) can miss someone under noise, dust, or protective gear.

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