FPE Final Exam
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Refrigerants have a large _____ _____ and low _____ ______. | latent heat, boiling point
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| Define latent heat. | A quantity of heat added or removed during a phase change.
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| The boiling point for a refrigerant can be adjusted by changing ______. | pressure
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| The freezing temperature of a refrigerant should be below the _____ temperature. | evaporator
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| T or F: The critical temperature for a refrigerant should be sufficiently low. | False
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| ____ as a refrigerant has a very high latent heat of vaporization. | Ammonia
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| What happens in the evaporator of a refrigeration system? | Liquid refrigerant vaporizes to a gaseous state.
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| T or F: Refrigerator space decreases the temperature of the surroundings. | True
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| What are the two types of evaporators for a refrigeration system? | Direct-expansion, indirect-expansion
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| T or F: Direct-expansion evaporators are used when cooling is desired in several locations in a system. | False
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| Refrigerant enters the compressor in a ____ state at ____ pressure and temperature. | vapor, low
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| The compressor raise the _____ and _____ of the refrigerant. | pressure, temperature
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| What are the three types of compressors? | Reciprocating, centrifugal, rotary
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| What is the purpose of a condenser in a refrigeration system? | Transfers heat from the refrigerator to another medium.
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| What is the purpose of an expansion valve in a refrigeration system? | Controls the flow of liquid refrigerant to the evaporator.
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| Define flashing. | When the heat given up by refrigerant is used to convert some liquid into vapor.
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| Define cooling load. | The rate of heat energy removed from a given space in order to lower the temperature of that space to a desired level.
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| Multi-stage refrigeration systems involve more than one _____. | compressor
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| T or F: Multi-stage refrigeration systems cause an decrease in total power requirement. | True
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