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Refrigerants used in mechanical refrigeration systems are derived from fluorine and bromine.

Blowdown of a gauge glass is performed by opening the gauge glass blowdown valve.

In order to reduce the viscosity of fuel oil, it is necessary to ___.

A back-pressure burner is a burner consisting of tubes with drilled holes that allow pressurized gas to escape into the furnace where the gas is burned.

___ is the amount of fuel a burner is capable of burning in a given unit of time.

Flame failure can cause a furnace explosion from the buildup and ignition of fuel.

Flame failure can cause a furnace explosion from the buildup and ignition of fuel.

Class ___ fires are fires that burn combustible metals such as zirconium, titanium, magnesium, sodium, and potassium.

___ combines with oxygen to form sodium sulfate, which accumulates at the bottom of a boiler.

___ combines with oxygen to form sodium sulfate, which accumulates at the bottom of a boiler.