Red Seal Gasfitter — Class B Practice Exam

The purpose of a pressure test for gas lines is primarily to ensure there are no leaks in the system. Conducting a pressure test involves filling the gas line with air or an inert gas and monitoring it for any drop in pressure over a specific period. A pressure drop indicates a potential leak, which is critical to identify before the system is put into operation, as leaks can pose significant safety hazards, including fire and explosion risks.

The other options address different aspects of gas line operation or maintenance but do not reflect the primary intent of a pressure test. For example, measuring gas pressure in appliances pertains to ensuring correct operation and settings after installation, while regulating gas flow is an operational function managed by control systems rather than a test process. Likewise, determining energy efficiency involves evaluating the performance and efficiency of the entire system but is unrelated to the leak detection purpose of pressure testing.