A(n) ___ is a component directly attached to a boiler that is required for the operation of the boiler.

A(n) ___ is a device used to test steam trap function by comparing sound waves emitted during different load conditions with a properly operating steam trap.

A package boiler is a self-contained unit that is preassembled at a factory.

___ systems are commonly used to cool large buildings such as hotels and stadiums.

If a flame scanner does not prove a pilot flame during the pilot flame-establishing period, the pilot ___ will be de-energized, preventing fuel flow to the burner.

A faulty safety valve could cause a boiler explosion.

Run period is the period after ignition trials but before the operating set point is reached while the main burner is firing.

Steam allowed to enter the Bourdon tube of a pressure gauge can result in a false reading and/or cause damage from warping.

Hot water heating systems transfer heat by circulating heated water to and from a building space.

During a boiler inspection, the main steam stop valve is ___.