Examples of exam questions for master plumber

The plumber master exam is a group of tests that test a plumber’s knowledge of state and federal regulations and plumbing codes. Passing the exam gives the plumber the title of “Master Plumber”, which is a requirement in some companies. The master plumbers also generally earn more than those with only a certification officer plumber. In order to successfully pass the plumber master exam, it is important to know the types of questions that can be expected.

Tube size tables

One section of the test tests the plumber’s ability to correctly measure different pipe sizes in accordance with established size tables. The size tables are provided in the test as a reference and the questions determine whether or not the applicant understands how to read the tables rather than memorize them. The test section of pipe sizes tables is divided into four subsections: pipes fuel of gas, piped water, ventilation pipes fed fuel gas and drainage tubes devices. In each subsection, the plumber is given a drawing or diagram and asked to determine the appropriate pipe sizes based on the information contained in the tables.

Mathematical questions

The math section of the exam tests the plumber’s ability to make correct calculations during the installation and design of plumbing systems. The applicant is provided conversion tables and measures, size, formulas, a calculator and any other information necessary to obtain the correct answers.

Two examples of questions are: “If a drainage ditch should be 148 feet (45 m) long and the pipe installed at a 2 percent grade, what is the total amount of fall?” And “There is a copper water elevator that is 6 inches (15 cm) in diameter and 50 feet (15 m) high that is filled with water. How many gallons (liters) of water are in the tube? The questions in the math section of the exam are presented in a multiple choice format with four possible answers for each question.


A section of the exam assesses the plumber’s knowledge of the Occupational Safety and Health Administration (OSHA) federal code regulations. The applicant must be aware of the safety standards with respect to hand and power tools, welding and cutting, excavation, scaffolding and personal protection and life support equipment. An example of a question from this part of the test is: “How many times should the scaffolding and its surrounding components be able to withstand the maximum expected load?” Each question in the OSHA code section of the exam is presented in a multiple choice format with four answer options given per question.

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