A direct digital control (DDC) system uses multiple inputs and outputs in the form of ____ to operate an HVAC or automated building system.

A control system that relies on a human operator to act as the conditioned space’s sensor is a(n) ____.

Sometimes called error, the deviation between set point and control point is the ____.

Unlike a contactor, a motor starter is equipped with built-in ____.

The temperature or pressure value at which a device ceases operation is its ____.

Which type of bimetal device expands or contracts and tilts a mercury switch that serves as the electrical contact between wires?

Sensing bulbs typically use a bellows or ____ to open and close contact points as their internal pressure changes.

The term for the present condition in a conditioned space is the ____.

Which type of relay prevents a circuit from restarting until the power to its coil is interrupted?

The type of fuse that blows immediately after its maximum rating is exceeded is a ____ fuse.