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A(n) ___ is a chemical substance that vaporizes (boils) at a low temperature.
___ heat is heat energy that can be measured by a change in temperature.
Change of ___ is the process that occurs when enough heat is added to or removed from a substance to change it from one physical state to another.
A(n) ___ is a heat ex-changer through which heat is transferred to the low-pressure refrigerant liquid.
A(n) ___ is a temperature sensor inside a temperature-controlled space that sends signals to a control system in order to maintain a set temperature.
T or F
Refrigeration systems are designed to maintain a specific temperature rather than a range of temperatures.
T or F
Heat flows only from a warmer temperature to a cooler temperature.
A(n) ___ pump is a mechanical compression refrigerant system that can reverse the flow if refrigerant, switching between heating and cooling modes.
___ is the cooling of a substance to a temperature that is lower then its saturation temperature at a particular pressure.
___ condensers are the most common condensers used in refrigerant systems.
An automatic ___ valve is a valve that is opened and closed by the pressure in the line ahead of the valve.
___ is the temperature below which moisture in the air begins to condenses.
The ___ is the difference between the cut-out pressure and cut-in pressure of a compressor.
T or F
Heat pumps are classified as air-to-air, water-to-water, or air-to-water.
T or F
Charging is adding refrigerant to a system.
A(n) ___ device is a component that controls the flow rate of refrigerant into a evaporator.
___ temperature is the temperature at which a refrigerant changes state by vaporizing or condensing.
T or F
All substances exist in either a solid, liquid, or gaseous state.
___ is capable of moving such more heat per pound if liquid vaporized than other refrigerants.
T or F
High-pressure refrigerant can freeze the eyes and skin.
___ is a measurement of the intensity of heat.
___ Heat is the heat energy that causes a change of state but no temperature change.
A(n) ___ is a heat ex-changer that removes heat from high-pressure refrigerant vapor.
A ___ compressor is a compressor that is completely sealed inside a welded case.
Compressor ___ occurs when the compressor motor over heats, melting the motor insulation.
___is a sensible heat added to a substance after it has turned to vapor.
___ humidity is the amount of moisture in the air compared to the amount of moisture the air would hold if it were saturated.
A(n) ___ valve is a valve that removes unwanted gases from the system.
Refrigerant ___ is the process of removing refrigerant from a system and capturing it in a recovery cylinder, with no cleaning of refrigerant.
A deep vacuum for refrigerant evacuation is a vacuum between ___.
A(n) ___ point is a point in a refrigeration system where there is a significant pressure change.
Tor F
Refrigerant used in modern refrigeration systems are derived from methane or ethane.
___ is the process of varying the amount of refrigeration system where there is a significant pressure change.
T or F
A micron is a unit of measure equal to one-millionth of an inch.
T or F
An electronic leak detector may give an audible tone or a visual signal when the detector senses refrigerant.
___ is a form of energy identified by a temperature difference between objects or a change of state.
Saturated liquid is liquid at a certain pressure and temperature that vaporizes if the temperature ___.
T or F
Adding heat increases the energy content of a substance.
A(n) ___ comb is a device used to straighten the edges of the thin metal that extend from condensers or evaporator coil.
T or F
Liquids cannot be compressed.
