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Hvac 1000-01
quiz
| Question | Answer |
|---|---|
| Heat | energy that causes molecules to be in motion and to raise the temperature |
| British Thermal Unit(BTU) | The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit |
| Saturation | a term used to describe a substance when contains all of another substance it can hold |
| Vapor | the gaseous state of a substance |
| Specific Heat | the amount required to raise the temperature of one pound of substance one degree. |
| Condensation | liquid formed when a vapor condenses |
| Refrigerant | the fluid in a refrigeration system that changes from liquid to a vapor and back to a liquid at practical temperatures. |
| Mass | matter held together to the extend that it is considered one body |
| Compound Gage | A gauge used to measure the pressure above and below the atmosphere's standard pressure. It can be found on all gauge manifolds used in refrigeration service work. |
| Condensing Pressure | the pressure that corresponds to the condensing temperature in a refrigeration system |
| Fahrenheit Scale | the temperature scale that places the boiling point of water 212 degree(F) and the freeing point at 32 degree(F) |
| Change of State | the condition that occurs when a substance changes from one physical state to another, such as ice to water and water to steam |
| Dew point | the exact temperature at which moisture begins to form. |
| Sensible Heat | Heat that causes a change in temperature |
| Atmospheric Pressure | the weight of the atmospheres gases pressing down on the earth.=14.696 psi at sea level and 70 degree(F) |
| Laten Heat | Heat energy absorbed or rejected when a substance is changing state and there is no change in temperature. |
| Temperature | A word used to described level of heat or molecular activity, expressed in Fahrenheit, Rankine,Celsius, or Kelvin units |
| Ambient Temperature | the surrounding air temperature |
| Cold | heat at lower levels in intensity |
| Radiant Heat | Heat that passes through air, heating solid objects that in turn heating the surrounding area |
| Therm | Quantity of heat 100,000 BTU |
| Convection | Heat transfer from one place to another using a fluid |
| Evaporation | the condition that occurs when heat is absorbed by liquid and it changes to vapor |
| Ton of Refrigeration | the amount of heat required to melt a ton(2000 lb) of ice at 32 degree(F) in 24 hours, 288,000 BTU/24h, or 200 BTU/min |
Created by:
toolegit
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