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20 Cards in this Set

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12-1. What formula is used to change a Fahrenheit heat reading to a Celsius reading? 1. C = (F -32) ÷ 1.8 2. C = (F +10) x 1.3 3. C = (F -25) ÷ 1.4 4. C = (F +16) x 1.7
1. C = (F -32) ÷ 1.8
12-2. What type of heat changes the temperature of a substance, but not its physical state?
2. Sensible
12-3. What is the process called, that changes a vapor into a liquid?
4. Condensation
12-4. (True or False) The components of a refrigeration system consist of a compressor, liquid receiver, evaporator, and control devices.
1. True
12-5. What type of refrigeration system compressor is bolted together, has a crankshaft that extends through the crankcase, and is driven by a flywheel and belt?
3. External drive
12-6. Which expansion valve is used to maintain a constant pressure in direct drive and dry type evaporators?
2. Automatic
12-7. Which refrigerant is an azeotropic that can only be used with reciprocating compressors?
4. R-502
12-8. Which refrigerant has a boiling point of -55.3°F at atmospheric pressure, and is used to replace R-502 refrigerant?
2. R-125
12-9. (True or False) When storing refrigerants in a cylinder, it is acceptable to use the same regulator for different types of refrigerants.
2. False
12-10.(True or False) Refrigerant cylinders should never be exposed to continuous dampness or salt water.
1. True
12-13.(True or False) A common practice is the parallel operation of two or more reciprocating compressors for refrigeration system.
2. False
12-14.(True or False) Using two equalizer lines between the crankcase, on above the normal oil level and one below, is a method of piping that maintains proper oil level in two or more compressors.
1. True
12-15.What size refrigerant shutoff valve, in inches, should be used when transferring refrigerant from the storage cylinder to the service cylinder?
3) 1/4
12-16.What is the most sensitive type of leak detector?
1. Electronic
12-17.(True or False) The first step to follow when disassembling a compressor because of knocking is to expose the top of the piston by removing the cylinder head and valve plate.
1. True
12-18.(True or False) Fan troubles are very hard to locate and correct during compressor inspections.
2. False
12-19.What type of chemical is used in a unit dehydrator to absorb moisture from the refrigerant as it passes through the dehydrator?
3. Desiccant
12-20.Which action should be taken to any loose hinge pins that are found on a unit’s door hinge?
2. Braiding
12-21.(True or False) Operation and maintenance logs should not be used for spotting troubles in refrigeration equipment.
2. False
12-22.(True or False) Maintenance logs can be used to figure future maintenance cost requirements.
1. True