The mercury tube in a pressure control must be inspected at least ___ for mercury vaporization.

A variable-speed drive (VSD) is a motor controller used to vary the frequency of the electrical signal supplied to an AC motor in order to control its rotational speed.

Surge tanks are vented to the atmosphere and commonly lined with an epoxy coating to prevent corrosion.

___ states, “The training requirements contained in this section apply to employees who face a risk of electric shock that is not reduced to a safe level by the electrical installation.”

The mercury tube in a pressure control must be inspected at least ___ for mercury vaporization.

A thermodynamic steam trap opens and closes by a single ___ that rises to allow the discharge of air and cool condensate.

The two types of draft produced in a boiler are mechanical and forced.

A steam trap that fails to open causes a heating unit to become ___.

The range of pressure on a vacuum switch is usually ___.

Air or gases flow from a location of low pressure to a location of high pressure.