Surface impurities increase the surface tension in a blowdown line by creating a film which prevents ___ bubbles from breaking through the surface of the water.

Feedwater chemicals are mixed in the ___.

Low water fuel cutoffs must be ___ for proper performance.

Spontaneous combustion is combustion caused by self-ignition through chemical action.

The ___ of fuel oil is the lowest temperature at which it will flow as a liquid.

Water becomes less dense as it is heated.

A ___ is a vessel that prevents damage to a sewer system from steam and hot water by holding blowdown water until it is cool enough for safe discharge.

Personal protective equipment (PPE) is a device or clothing worn by a boiler operator to prevent injury.

A temperature-pressure gauge has two scales.

A steam header is a distribution pipe that supplies steam to branch lines.