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单选题
To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
A
suction service valve as a vapor
B
suction service valve as a liquid
C
discharge service valve as a vapor
D
charging valve as a liquid
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sudden evaporation of wax crystals in the lubricantB
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单选题In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）A
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high line voltageD
air in the system
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单选题In an air conditioning system, moisture is removed from the air by（）A
filersB
separatorsC
ducted trapsD
dehumidifiers
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单选题A re-heater in an air conditioning system functions to （）.A
control inlet air temperatureB
control inlet air volumeC
maintain relative humidity at 15%D
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单选题A re-heater, as used in an air conditioning system, is designed to control the （）A
chilled water temperatureB
dew point temperatureC
primary air temperatureD
dry bulb temperature
考题
单选题When the relief valve opens it discharges high pressure refrigerant vapor to the （）.A
liquid strainerB
refrigerant inlet of the condenserC
inlet side of the evaporatorD
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单选题Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.A
maintain adequate coil back pressureB
prohibit flashing in the liquid lineC
reduce refrigerant volume in the systemD
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
passing it through the expansion valveB
condensing refrigerant in the system condenserC
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD
maintaining a high pressure on the systems receiver
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单选题Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?（）A
Air or NitrogenB
Seawater or Fresh waterC
Sodium Nitrate brineD
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单选题Air conditioning is the process of treating air to control （） its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.A
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instantaneouslyC
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单选题In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.A
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单选题With ducted air conditioning systems, the modern tendency is to use（）A
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high velocity systemC
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考题
单选题To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）A
suction service valve as a vaporB
suction service valve as a liquidC
discharge service valve as a vaporD
charging valve as a liquid
考题
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.A
discharge service valve as a vaporB
suction service valve as a liquidC
charging valve as a liquidD
condenser purge valve as a vapor
考题
单选题To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）A
admit only enough fresh outside air to provide proper ventilationB
reduce the air reheating system loadC
lower the compressor head pressureD
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考题
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
purge air from the condenserD
clean the waterside of the condenser
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单选题A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）A
purge lube oil from the liquid refrigerantB
recover water purged from the systemC
separate foul gases from the receiverD
purge non-condensable gases without losing refrigerant
考题
单选题The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.A
balanceB
not balanceC
be more thanD
be less than
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