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10 Cards in this Set
- Front
- Back
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What function does a chemical dot serve when it is placed under the glass lens of a sight glass and is exposed to the refrigerant liquid? a) monitor liquid flow b) monitor refrigerant levels c) monitor the presence of moisture d) monitor the presence of foreign particles e) monitor the pressure levels |
c) monitor the presence of moisture |
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Which of the followings is not correct? a) the pressure shown on an evaporator and condenser indicate the corresponding evaporator and condenser temperatures b) liquid refrigerant may occasionally leave the evaporator and cause damage to the compressor if not removed c) accumulation of oil in the condenser only results in high compressor discharge pressure and increased d) a strainer is installed in the suction line of the compressor to remove any particle from the vapor before it enters the compressor e) a filter-drier is placed in the liquid refrigerant line ahead of the expansion valve |
c) accumulation of oil in the condenser only results in high compressor discharge pressure and increased |
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A simple trap is located in the suction line before the compressor that collects liquid, where it evaporates and returns to the compressor as a gas is called a/an a) oil separator b) strainer-drier c) distributor d) accumulator e) stop valve |
d) accumulator |
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Which of the following pipe joints should be used for high pressure 31.75mm or smaller piping? a) welded b) screwed c) soldered d) flared e) bolted flange |
b) screwed |
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Which of the following statements about strainers is false? a) the strainer is installed in the suction line b) piping must be disconnected to clean the strainer c) hermetic type compressors are equipped with a built in suction strainer d) strainers typically consist of a fine mesh screen basket e) strainers prevent foreign particles from damaging compressor valves |
b) piping must be disconnected to clean the strainer |
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Which of the following statements about pressure gauges is true? a) they indicate pressures and under normal conditions show corresponding evaporator and condenser temperatures b) dials on refrigeration pressure gauges do not indicate saturation temperature c) only one pressure gauge is required for each system d) the pressure gauge will not work if the system is equipped with pulsation dampeners e) indicate pressure only under normal conditions |
a) they indicate pressures and under normal conditions show corresponding evaporator and condenser temperatures |
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Pressure relief devices are used to counter which of the following problems? a) dangerously low system pressures b) toxic refrigerant leaks c) combustion of flammable refrigerants d) dangerously high system pressures e) high temperatures |
d) dangerously high system pressures |
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A direct expansion type evaporator that has no more than one refrigerant circuit in it requires what to have even refrigerant flow in each circuit? a) stop valve b) purge valve c) distributor d) purge valve e) thermal regulator |
c) distributor |
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The emergency discharge line in a refrigeration system a) is located only on the condenser b) shall have a shut off valve outside the building c) is required on all sized on refrigerating units d) is located on the evaporator e) is a vented sewer line |
b) shall have a shut off valve outside the building |
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According to CSA B52, refrigerant discharge to atmosphere shall not be less than _______ above the adjoining ground level a) 4m b) 4.6m c) 5m d) 10m e) 15m |
b) 4.6m |
