Minnesota Boiler License Practice Exam 2026 - Free Boiler License Practice Questions and Study Guide

A first-class engineer's license Grade B allows an operator to have operational responsibility for boilers with specific limitations. The correct choice indicates that the license is applicable to boilers with a total boiler horsepower not exceeding 50 horsepower, whether they are liquid or vapor. This limitation is in place to ensure that operators work within a defined scope of knowledge and experience, which is particularly important for safety and compliance with regulatory standards.

Boilers have distinct operational requirements based on their capacity and pressure, and the Grade B designation reflects the level of training and expertise needed to manage them. By limiting the horsepower to 50, the licensing ensures that individuals are adequately qualified to handle potential hazards associated with those boilers, taking into consideration their design and the operations they are involved in.

The other options do not accurately describe the scope of responsibility associated with a first-class engineer's license Grade B. For instance, low and high-pressure boilers would demand a higher level of authority and expertise. Similarly, granting total operational responsibility without horsepower limitations would not align with the intended safety measures and regulatory compliance established for boiler operation in Minnesota.