Free Journeyman Plumber Exam Questions That Helps Candidates Pass

According to storm drainage sizing tables, a 4-inch leader is required for a 1,500 sq. ft. roof at 3 inches/hour rainfall intensity. Journeyman exams include such problems to test ability to use code tables. Improper sizing leads to flooding or roof collapse during heavy rain events.

Mechanical compression fittings (such as slip-on compression unions) are not permitted in concealed spaces because they can loosen or leak over time. Codes require joints in concealed areas to be of types that ensure permanent, secure connections such as brazed, soldered, welded, or shielded couplings. Shielded hubless couplings with stainless-steel bands are widely approved for no-hub cast iron. The journeyman exam tests recognition of approved joint methods for various materials (PVC solvent-weld, copper solder/braze, cast iron hub and spigot, PEX crimp). Knowing where fittings are permissible—exposed vs. concealed—is essential for compliance and preventing undetectable failures.

A 3-inch building drain is sufficient for a single water closet and one lavatory. Codes allow 3-inch drains for single-family residences with limited fixture load. Journeyman exams test these sizing rules since undersized drains cause backups while oversizing increases cost unnecessarily.

Air testing is not permitted for water piping because of the danger of pipe bursts and severe injury. Water supply systems must be hydrostatically tested at 150 psi or 50 psi above working pressure. Journeyman exams stress this rule for safety and compliance.

Supply systems are hydrostatically tested with water at 150 psi or 50 psi above working pressure. Air testing of water piping is not permitted due to safety risks. Journeyman exams stress this because inspectors enforce this standard during inspections.