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25 Cards in this Set
- Front
- Back
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The Fahrenheit scale is based on boiling water having a sea level temperature of...
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212
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Five points of water heated to raise the temperature 2 degrees requires...
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10 Btus
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Sensible heat is heat that..
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can be sensed by a thermometer
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Superheat is added...
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after all liquid has been changed to vapor
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The transfer of heat from one object to another by direct contact is called...
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conduction
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A ton of refrigeration is equal to..
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12k Btus per hour
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Zero gauge pressure corresponds on the absolute scale to...
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14.7 psi
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The boiling temperature of a liquid will be lower as...
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the pressure is decreased
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A gas or liquid always flows...
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from a higher pressure to a lower pressure
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In a refrigeration system, the high-pressure, high-temperature vapor is converted into a high-pressure, high-temperature liquid by the...
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condenser
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In a refrigeration system, the low-pressure, low-temperature liquid is converted into a low-pressure, low-temperature vapor by the...
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evaporator
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In a refrigeration system, the low-pressure, low-temperature vapor is converted into a high-pressure, high-temperature vapor by the...
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compressor
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The low side of the refrigeration system includes the...
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suction side (input) of the compressor
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Head pressure refers to the pressure in the...
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high side of the system
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If a gas is superheated 15 degrees to a temperature of 87 degrees, we can determine that its...
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boiling point is 72 F
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The difference between a halocarbon and a fluorocarbon refrigerant is that...
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the fluorocarbon always has fluorine in it, but not all halocarbons do
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The fluorocarbon refrigerants considered least harmful to the environment are the...
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HFC's
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What is the color code for refrigerant recovery cylinders?
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Gray with a yellow top
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A compressor with a piston that travels back and forth in a cylinder is a _____ compressor
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reciprocating
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The main purpose of a condenser is to...
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remove heat from the refrigerant
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The main purpose of an evaporator is to...
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add heat to the refrigerant
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A TXV regulates the flow of refrigerant to the evaporator in order to maintain a constant...
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superheat
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Components (accessories) most often found in the refrigeration system liquid line are...
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receiver, sight glass/ moisture indicator, filter-drier
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A secondary control is used to...
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regulate and or protect the cycle
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Horizontal piping runs used in refrigeration system should...
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pitch in the direction of flow
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