My Term to Learn
Electrical, mechanical, electromechanical, digital, and pneumatic are all types of
controls
A column of temperature-sensitive fluid rising and falling within a hollow stem in response to a sensed temperature or level of heat intensity best describes the function of a ________.
thermometer
It varies its resistance to current flow based on its temperature.
thermistor
Metals most often used in a bimetal temperature control.
brass and steel
It straightens out with an increase vapor pressure.
bourbon tube
It is the most common device used to detect thermal change.
bimetal device
An accordion-like device that expands and contracts when internal pressure (usually vapor) changes is a ________.
bellows
Modulating controls are used to ____.
Vary the speed of a motor
This is an example of a bimetal device.
snap-disc
It converts heat to an electrical energy.
thermocouple
It is required to control space or product temperature.
thermostat
The main purpose of the HVAC/R industry is to control space or product conditions by controlling
temperature, humidity, air quality, and air cleanliness
Devices such as thermostats, that open and close their contacts during normal operation of the system are referred to as
operational controls
It is a way to sense temperature change.
fluid expansion
It's normally used with a vapor instead of a liquid inside
bellows
To make bi-metal devices practical overall wider temperature range, the Bi-Metal strip is
lengthened
This may occur if a specific electrical or mechanical component is not cooled properly, resulting in
overheating
The protective device on a compressor that keeps it from overloading and damaging itself.
overload
What a properly operating thermocouple connected to a solenoid in a gas valve should put out
20 to 30 millivolts
They're used in adding length to a bimetal element
coiled, helix, hairpin, and worm
A thin, flexible, movable membrane that is used to convert pressure changes to movement or motion in a control.
diaphragm
It is intended to maintain stable or constant conditions without excessive human interference.
Automatic Control
They are typically normally closed devices that open their contacts only when the device senses system conditions that are outside the designed operating range
Safety devices
The resistance increases as the temperature increases.
PTC
It's purpose is to reduce the temperature swing of a conditioned space.
heat anticipator