Unit 36 Review Questions
What advantage does a capillary tube have over a TXV
Capillary tubes the refrigerant pressures are equalized during the off-cycle unlike the TXV
True or False: Evaporative air-conditioning will work in any climate
False, evaporative air conditioning will not work in any climate
What are the advantages of using refrigerated air conditioning rather than evaporative cooling
Refrigerated air conditioning uses 4 components that are assembled in several ways to accomplish the same goal, refrigerated air to cool a space
Most compressors are cooled using the _____________
Rotary and scroll compressors are cooled by the discharge gas leaving the compressor. Serviceable hermetic compressors are air-cooled
What advantage do TXV's have over capillary tubes
TXV's are more efficient than capillary tubes
The ___ expansion device ordinarly must use a compressor with a high starting torque
The TXV expansion device ordinarily must use a compressor with a high starting torque
The design boiling point for most evaporator coils in residential air conditioning is___
The design boiling point for most evaporator coils in residential air conditioning is 75 degrees Fahrenheit
The dew point temperature tells you how much ____ is in the air
The dew point temperature tells you how much humidity is in the air
List the four major components of an air conditioning system
The four major components of an air-conditioning system are the evaporator, compressor, condensor, and the metering device
The large interconnecting line between the indoor and outdoor coil is the ___line
The large interconnecting line between the indoor and outdoor coil is the cool gas line
The most popular refrigerant used in the past for residential air conditioning is R-___
The most popular refrigerant used in the past in residential air conditioning is R-134a
The outside design temperatures in the summer in Tuscon, Arizona, for 2.5% of the time are ____ degrees Fahrenheit dry bulb and ____degrees Fahrenheit wet bulb
The outside design temperatures for summer in Tuscon, Arizona, for 2.5% of the time are dry bulb and 71 degrees Fahrenheit wet bulb
What refrigerant blend can be used in retrofit applications as a long term replacement in residential and light commercial applications
The refrigerant blend that can be used in retrofit applications as a long term replacement in residential and light commercial applications is R-134a
The small interconnecting line between the indoor and outdoor coil is the ____ line
The small interconnecting line between the indoor and outdoor coil is the liquid line
What are the three most common types of compressors used in air conditioning
The three most comon types of compressors used in air conditioning are centrifugal, screw, and reciprocating compressors
What two types of heat removed by the evaporator coil in the air conditioning process
The two types of heat are removed by the evaporator coil in the air-conditioning process are sensible and latent heat
What are two higher efficiency refrigerant blends that can be used as long term replacement for R-22 in residential and light commercial air conditioning applications
Two higher-efficiency refrigerant blends that can be used as long term replacements for R-22 in residential and light commercial air-conditioning applications are R-410a and R-134a
