Red Seal Gasfitter — Class A Practice Exam

Describe the primary function of an automatic air vent in a gas system.

1. To remove trapped air from the system to ensure better gas flow

2. To regulate the pressure within the gas system

3. To monitor the temperature of the gas

4. To purify the gas before it enters the system

The correct answer is: To remove trapped air from the system to ensure better gas flow

The primary function of an automatic air vent in a gas system is to remove trapped air, which ensures better gas flow. When air becomes trapped in gas lines or related systems, it can create blockages or reduce the efficiency of gas delivery. An automatic air vent works by detecting the presence of air and allowing it to escape without manual intervention. This helps maintain the integrity of the gas flow, preventing issues such as reduced pressure, blockage, or inconsistent gas delivery. Other choices, while relevant to gas systems, do not accurately represent the role of the air vent. The regulation of pressure is typically managed by pressure regulators, while temperature monitoring is performed by temperature sensors, neither of which aligns with the automatic air vent's function. Similarly, gas purification involves filtration systems designed to remove impurities and contaminants from the gas before it enters the system, which is distinct from the role of managing trapped air.