Which of the following is NOT one of the Quarterdeck Alarms?

The correct choice is that "Emergency" is not one of the Quarterdeck Alarms. The Quarterdeck Alarms are specific signals used to alert crew members on a ship to various operational situations. These alarms are crucial for ensuring the safety and readiness of the vessel and its personnel during different emergencies.

The General alarm typically signifies a readiness for immediate action, often involving drills or a significant situation that requires all hands to be prepared. The Chemical alarm is used in situations where chemical hazards may be present, alerting the crew to potential dangers that require protective measures. The Collision alarm warns the crew of an impending collision, prompting immediate actions to reduce risk and prepare for impact.

By understanding the context and functions of the recognized alarms, it becomes clear that "Emergency" does not specifically pertain to a distinctive alarm category in this context. It may refer more generally to any urgent situation rather than identifying a specific action or response.