1012243
| Questão | Responda |
| A(n) ___ is a chemical substance that vaporizes (boils) at a low temperature. | Refrigerant |
| ___ heat is heat energy that can be measured by a change in temperature. | Sensible |
| 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. | State |
| A(n) ___ is a heat ex-changer through which heat is transferred to the low-pressure refrigerant liquid. | Evaporator |
| 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. | Thermostat |
| T or F Refrigeration systems are designed to maintain a specific temperature rather than a range of temperatures. | False |
| T or F Heat flows only from a warmer temperature to a cooler temperature. | True |
| A(n) ___ pump is a mechanical compression refrigerant system that can reverse the flow if refrigerant, switching between heating and cooling modes. | Heat |
| ___ is the cooling of a substance to a temperature that is lower then its saturation temperature at a particular pressure. | Subcooling |
| ___ condensers are the most common condensers used in refrigerant systems. | Air-cooled |
| An automatic ___ valve is a valve that is opened and closed by the pressure in the line ahead of the valve. | Expansion |
| ___ is the temperature below which moisture in the air begins to condenses. | Due-point |
| The ___ is the difference between the cut-out pressure and cut-in pressure of a compressor. | Differential |
| T or F Heat pumps are classified as air-to-air, water-to-water, or air-to-water. | False NOT: Water-to-water |
| T or F Charging is adding refrigerant to a system. | True |
| A(n) ___ device is a component that controls the flow rate of refrigerant into a evaporator. | Metering device |
| ___ temperature is the temperature at which a refrigerant changes state by vaporizing or condensing. | Saturation |
| T or F All substances exist in either a solid, liquid, or gaseous state. | True |
| ___ is capable of moving such more heat per pound if liquid vaporized than other refrigerants. | Ammonia |
| T or F High-pressure refrigerant can freeze the eyes and skin. | True |
| ___ is a measurement of the intensity of heat. | Temperature |
| ___ Heat is the heat energy that causes a change of state but no temperature change. | Latent |
| A(n) ___ is a heat ex-changer that removes heat from high-pressure refrigerant vapor. | Condenser |
| A ___ compressor is a compressor that is completely sealed inside a welded case. | Hermetic |
| Compressor ___ occurs when the compressor motor over heats, melting the motor insulation. | Burnout |
| ___is a sensible heat added to a substance after it has turned to vapor. | Super heat |
| ___ humidity is the amount of moisture in the air compared to the amount of moisture the air would hold if it were saturated. | Relative |
| A(n) ___ valve is a valve that removes unwanted gases from the system. | Purge |
| Refrigerant ___ is the process of removing refrigerant from a system and capturing it in a recovery cylinder, with no cleaning of refrigerant. | Recovery |
| A deep vacuum for refrigerant evacuation is a vacuum between ___. | 400-700 |
| A(n) ___ point is a point in a refrigeration system where there is a significant pressure change. | Division |
| Tor F Refrigerant used in modern refrigeration systems are derived from methane or ethane. | True |
| ___ is the process of varying the amount of refrigeration system where there is a significant pressure change. | Unloading |
| T or F A micron is a unit of measure equal to one-millionth of an inch. | False |
| T or F An electronic leak detector may give an audible tone or a visual signal when the detector senses refrigerant. | True |
| ___ is a form of energy identified by a temperature difference between objects or a change of state. | Heat |
| Saturated liquid is liquid at a certain pressure and temperature that vaporizes if the temperature ___. | Increase |
| T or F Adding heat increases the energy content of a substance. | True |
| A(n) ___ comb is a device used to straighten the edges of the thin metal that extend from condensers or evaporator coil. | Fin |
| T or F Liquids cannot be compressed. | True |
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