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An outside-stem-and-yoke valve is a ___ valve that indicates whether it is open or closed by the position of the stem.

A photocell sensor senses ___ light.

The level of the water in a ___ indicates the water level in the boiler.

___ regulations place restrictions on the design and installation of fuel oil tanks.

Specific heat has no unit of measurement since it is a ratio, but it is almost identical numerically to the heat capacity because of the way the Btu is defined.

___ regulations place restrictions on the design and installation of fuel oil tanks.

A flame establishing period regulates burner firing rate by controlling a modulating motor connected to a combustion equipment control linkage.

The internal resistance of fuel oil to flow is the ___.

Specific heat has no unit of measurement since it is a ratio, but it is almost identical numerically to the heat capacity because of the way the Btu is defined.

In a float thermostatic trap, the ball float opens and closes a discharge valve depending on the amount of ___ in the chamber.