A hydrostatic test is a steam test used to check for boiler leaks.

A(n) ___ is a person who locks out or tags out machines or equipment in order to perform servicing or maintenance on that machine or equipment.

Fuel oil can be classified as distillate fuel oil or heavy fuel oil.

Scale and sediment cause pitting of boiler metal surfaces.

Latent heat is heat identified by a change of state and no temperature change of the substance.

A surge tank generally includes an automatic water makeup system with a float chamber that is located at the minimum water level.

A ___ is a device that sends a signal to a controller, such as a programmable logic controller or other digital controller.

Heat always flows from a material having a lower temperature to a material having a higher temperature.

Condensate may be directed to a condensate return tank or wasted to prevent boiler water contamination.

The three classifications of refrigerants most technicians work with today are chlorofluorocarbons (CFCs), hydrochloroflurorocarbons (HCFCs), and hydrofluorocarbons (HFCs).