Final answer:
The question concerns valve supervisory switches in fire protection systems, requiring them to activate an alert within one fifth of the travel distance or an unspecified number of hand wheel revolutions.
Step-by-step explanation:
The subject of the question is related to fire protection systems, more specifically about the valve supervisory (tamper) switches that are a critical component of such systems. These switches are designed to monitor the state of the system's valves and provide an early warning if they are tampered with or moved from their normal position. According to standards, valve supervisory switches must activate an alert if there is any off-normal position within one fifth of the total travel distance of the valve, or a specific number of hand wheel revolutions, which is not provided in the question. This type of question involves knowledge of safety standards and mechanical operation of fire suppression systems, and it is typically encountered in the field of engineering or a specialized college-level course on fire protection systems.