ESCO AIR CONDITIONING
EXAM
• Heat which causes a change in temperature of a
substance is calledANSWER Sensi- ble heat
• Heat added to a substance without a rise in
temperatureANSWER Latent heat
• Heat added to the refrigerant in a vapor state after the
evaporation process is calledANSWER Superheat
,• Scroll compressor move refrigerant byANSWER Involute
Spirals
• The movement of heat by way of fluid is calledANSWER
Convection
• The movement of heat by direct contact isANSWER
Conduction
• The standard unit for measuring the quantity of heat in a
substance isANSWER BTUs
• Refrigerant gives up heat whenANSWER It condenses
• Why must refrigerant in the suction line be slightly
warmer than the satura- tion temperature?ANSWER
Prevent liquid slugging of the compressor
• The state of the refrigerant in the suction line should
beANSWER Low pressure / Low temperature vapor
• The state of the refrigerant entering the condenser
isANSWER High pressure / Highly superheated vapor
, • The evaporatorANSWER Transfers heat from the
refrigerated space to the refrigerant
• Which of the following is not a thermodynamic property
of refrigerantsANSWER -
Flammability
• The sequential order of steps in the vapor
compressions process areANSWER -
Compression, Condensation, Expansion, Vaporization
• If a 30 pound cylinder of reclaimed R 410 a refrigerant
has been stored overnight at 70° the pressure in the
cylinder should be approximatelyANSWER 201 psig
• Fan airflow pressures are usually measured inANSWER
Inches of water column
• 0 pounds per square inch absolute isANSWER A
pressure which cannot be further reduced
EXAM
• Heat which causes a change in temperature of a
substance is calledANSWER Sensi- ble heat
• Heat added to a substance without a rise in
temperatureANSWER Latent heat
• Heat added to the refrigerant in a vapor state after the
evaporation process is calledANSWER Superheat
,• Scroll compressor move refrigerant byANSWER Involute
Spirals
• The movement of heat by way of fluid is calledANSWER
Convection
• The movement of heat by direct contact isANSWER
Conduction
• The standard unit for measuring the quantity of heat in a
substance isANSWER BTUs
• Refrigerant gives up heat whenANSWER It condenses
• Why must refrigerant in the suction line be slightly
warmer than the satura- tion temperature?ANSWER
Prevent liquid slugging of the compressor
• The state of the refrigerant in the suction line should
beANSWER Low pressure / Low temperature vapor
• The state of the refrigerant entering the condenser
isANSWER High pressure / Highly superheated vapor
, • The evaporatorANSWER Transfers heat from the
refrigerated space to the refrigerant
• Which of the following is not a thermodynamic property
of refrigerantsANSWER -
Flammability
• The sequential order of steps in the vapor
compressions process areANSWER -
Compression, Condensation, Expansion, Vaporization
• If a 30 pound cylinder of reclaimed R 410 a refrigerant
has been stored overnight at 70° the pressure in the
cylinder should be approximatelyANSWER 201 psig
• Fan airflow pressures are usually measured inANSWER
Inches of water column
• 0 pounds per square inch absolute isANSWER A
pressure which cannot be further reduced
