Refrigeration ESCO EXAM 2024-2025 with
Complete Solutions.
Heat ‘.which ‘.is ‘.added ‘.to ‘.a ‘.vapor ‘.after ‘.the ‘.change ‘.of ‘.state ‘.occurs ‘.is ‘.called ‘.- ‘.(correct ‘.answer)
‘.-superheat
A ‘.refrigerant ‘.gives ‘.up ‘.heat ‘.when; ‘.- ‘.(correct ‘.answer) ‘.-it ‘.condenses
it ‘.is ‘.desirable ‘.for ‘.refrigerant ‘.in ‘.the ‘.suction ‘.line ‘.to ‘.be ‘.slightly ‘.superheated ‘.in ‘.order ‘.to... ‘.- ‘.
(correct ‘.answer) ‘.-ensure ‘.liquid ‘.refrigerant ‘.does ‘.not ‘.enter ‘.the ‘.compressor
state ‘.of ‘.refrigerant ‘.in ‘.the ‘.suction ‘.line ‘.should ‘.be... ‘.- ‘.(correct ‘.answer) ‘.-low ‘.pressure/ ‘.low
‘.temperature ‘.vapor
state ‘.of ‘.refrigerant ‘.entering ‘.the ‘.condenser ‘.is... ‘.- ‘.(correct ‘.answer) ‘.-high ‘.pressure/ ‘.highly
‘.superheated ‘.vapor
the ‘.evaporator... ‘.- ‘.(correct ‘.answer) ‘.-Transfers ‘.heat ‘.from ‘.the ‘.refrigerated ‘.space ‘.to ‘.the
‘.refrigerant
which ‘.is ‘.not ‘.a ‘.thermodynamic ‘.property ‘.of ‘.refrigerants ‘.- ‘.(correct ‘.answer) ‘.-flammability
Zero ‘.psia ‘.(pounds ‘.per ‘.square ‘.inch ‘.absolute) ‘.is; ‘.- ‘.(correct ‘.answer) ‘.-a ‘.pressure ‘.which ‘.cannot
‘.be ‘.further ‘.reduced
zero ‘.psig ‘.is ‘.the ‘.same ‘.as ‘.- ‘.(correct ‘.answer) ‘.-atmospheric ‘.pressure
the ‘.temperature ‘.at ‘.which ‘.moisture ‘.will ‘.start ‘.to ‘.condense ‘.from ‘.the ‘.air ‘.is ‘.called... ‘.- ‘.(correct
‘.answer) ‘.-dew ‘.point ‘.temperature
a ‘.compound ‘.pressure ‘.gauge ‘.measures... ‘.- ‘.(correct ‘.answer) ‘.-pressure ‘.and ‘.vacuum
the ‘.main ‘.function ‘.of ‘.the ‘.condenser ‘.is ‘.to... ‘.- ‘.(correct ‘.answer) ‘.-To ‘.remove ‘.heat ‘.from ‘.the
‘.refrigerant
The ‘.heat ‘.removed ‘.from ‘.the ‘.refrigerant ‘.by ‘.the ‘.condenser ‘.is; ‘.- ‘.(correct ‘.answer) ‘.-Both ‘.sensible
‘.and ‘.latent ‘.heat.
in ‘.the ‘.evaporator... ‘.- ‘.(correct ‘.answer) ‘.-latent ‘.heat ‘.is ‘.transferred ‘.from ‘.the ‘.refrigerated ‘.space
‘.to ‘.the ‘.refrigerant
, an ‘.overcharge ‘.of ‘.refrigerant ‘.will ‘.cause... ‘.- ‘.(correct ‘.answer) ‘.-increased ‘.head ‘.pressure
the ‘.clearance ‘.space ‘.in ‘.a ‘.reciprocating ‘.compressor... ‘.- ‘.(correct ‘.answer) ‘.-has ‘.no ‘.effect ‘.on
‘.compressor ‘.capacity
which ‘.of ‘.the ‘.following ‘.types ‘.of ‘.air ‘.conditioning ‘.compressors ‘.is ‘.most ‘.energy ‘.efficient ‘.- ‘.
(correct ‘.answer) ‘.-centrifugal
the ‘.main ‘.function ‘.of ‘.the ‘.condenser ‘.is ‘.to... ‘.- ‘.(correct ‘.answer) ‘.-To ‘.remove ‘.heat ‘.from ‘.the
‘.refrigerant
Refrigerant ‘.R-134a ‘.vapor ‘.enters ‘.the ‘.condenser ‘.at ‘.124psig, ‘.100°F. ‘.it ‘.leaves ‘.the ‘.condenser ‘.at
‘.80°F. ‘.its ‘.pressure ‘.will ‘.be ‘.approximately... ‘.- ‘.(correct ‘.answer) ‘.-124psig
three ‘.basic ‘.types ‘.of ‘.condensers ‘.are ‘.water ‘.cooled, ‘.air ‘.cooled, ‘.and ‘.___ ‘.cooled. ‘.- ‘.(correct
‘.answer) ‘.-evaporative
10 ‘.lbs. ‘.of ‘.refrigerant ‘.passing ‘.through ‘.a ‘.water ‘.cooled ‘.condenser ‘.will ‘.lose ‘.20 ‘.btu's ‘.of ‘.heat
‘.per ‘.lb. ‘.if ‘.10lbs ‘.of ‘.water ‘.passes ‘.through ‘.the ‘.condenser ‘.with ‘.an ‘.entering ‘.air ‘.temperature ‘.of
‘.80°F. ‘.the ‘.temperature ‘.of ‘.the ‘.water ‘.leaving ‘.the ‘.condenser ‘.is... ‘.- ‘.(correct ‘.answer) ‘.-100°F
which ‘.of ‘.the ‘.following ‘.can ‘.not ‘.be ‘.used ‘.as ‘.a ‘.low ‘.ambient ‘.temperature ‘.control ‘.- ‘.(correct
‘.answer) ‘.-crankcase ‘.regulating ‘.valve
when ‘.testing ‘.the ‘.efficiency ‘.of ‘.an ‘.AIR ‘.COOLED ‘.condenser, ‘.the ‘.refrigerant ‘.condensing
‘.temperature ‘.should ‘.be ‘.no ‘.more ‘.than ‘.___ ‘.higher ‘.than ‘.the ‘.leaving ‘.air ‘.temperature ‘.- ‘.(correct
‘.answer) ‘.-approximately ‘.30°F
when ‘.testing ‘.the ‘.efficiency ‘.of ‘.a ‘.WATER ‘.COOLED ‘.condenser, ‘.the ‘.refrigerant ‘.condensing
‘.temperature ‘.should ‘.be ‘.no ‘.more ‘.than ‘.___ ‘.higher ‘.than ‘.the ‘.leaving ‘.water ‘.temperature ‘.- ‘.
(correct ‘.answer) ‘.-approximately ‘.10°F
the ‘.first ‘.function ‘.the ‘.condenser ‘.must ‘.perform ‘.is ‘.to ‘.___ ‘.the ‘.refrigerant ‘.before ‘.condensing
‘.can ‘.occur ‘.- ‘.(correct ‘.answer) ‘.-de-superheat
A ‘.TXV ‘.is ‘.designed ‘.to ‘.maintain... ‘.- ‘.(correct ‘.answer) ‘.-constant ‘.evaporator ‘.superheat
the ‘.AXV ‘.is ‘.designed ‘.to ‘.maintain... ‘.- ‘.(correct ‘.answer) ‘.-constant ‘.evaporator ‘.pressure
A ‘.TXV ‘.has ‘.three ‘.operating ‘.pressures... ‘.- ‘.(correct ‘.answer) ‘.-evaporator ‘.pressure, ‘.spring
‘.pressure, ‘.and ‘.suction ‘.bulb ‘.pressure
when ‘.mounting ‘.a ‘.TXV ‘.sensor ‘.bulb, ‘.which ‘.of ‘.the ‘.following ‘.is ‘.NOT ‘.true ‘.- ‘.(correct ‘.answer) ‘.-it
‘.must ‘.be ‘.installed ‘.lower ‘.than ‘.the ‘.valve ‘.body
in ‘.an ‘.air ‘.conditioning ‘.system ‘.that ‘.uses ‘.a ‘.thermostatic ‘.expansion ‘.valve, ‘.the ‘.temperature ‘.of
‘.the ‘.evaporator ‘.outlet ‘.will ‘.usually ‘.be... ‘.- ‘.(correct ‘.answer) ‘.-warmer ‘.than ‘.the ‘.evaporator ‘.inlet
Complete Solutions.
Heat ‘.which ‘.is ‘.added ‘.to ‘.a ‘.vapor ‘.after ‘.the ‘.change ‘.of ‘.state ‘.occurs ‘.is ‘.called ‘.- ‘.(correct ‘.answer)
‘.-superheat
A ‘.refrigerant ‘.gives ‘.up ‘.heat ‘.when; ‘.- ‘.(correct ‘.answer) ‘.-it ‘.condenses
it ‘.is ‘.desirable ‘.for ‘.refrigerant ‘.in ‘.the ‘.suction ‘.line ‘.to ‘.be ‘.slightly ‘.superheated ‘.in ‘.order ‘.to... ‘.- ‘.
(correct ‘.answer) ‘.-ensure ‘.liquid ‘.refrigerant ‘.does ‘.not ‘.enter ‘.the ‘.compressor
state ‘.of ‘.refrigerant ‘.in ‘.the ‘.suction ‘.line ‘.should ‘.be... ‘.- ‘.(correct ‘.answer) ‘.-low ‘.pressure/ ‘.low
‘.temperature ‘.vapor
state ‘.of ‘.refrigerant ‘.entering ‘.the ‘.condenser ‘.is... ‘.- ‘.(correct ‘.answer) ‘.-high ‘.pressure/ ‘.highly
‘.superheated ‘.vapor
the ‘.evaporator... ‘.- ‘.(correct ‘.answer) ‘.-Transfers ‘.heat ‘.from ‘.the ‘.refrigerated ‘.space ‘.to ‘.the
‘.refrigerant
which ‘.is ‘.not ‘.a ‘.thermodynamic ‘.property ‘.of ‘.refrigerants ‘.- ‘.(correct ‘.answer) ‘.-flammability
Zero ‘.psia ‘.(pounds ‘.per ‘.square ‘.inch ‘.absolute) ‘.is; ‘.- ‘.(correct ‘.answer) ‘.-a ‘.pressure ‘.which ‘.cannot
‘.be ‘.further ‘.reduced
zero ‘.psig ‘.is ‘.the ‘.same ‘.as ‘.- ‘.(correct ‘.answer) ‘.-atmospheric ‘.pressure
the ‘.temperature ‘.at ‘.which ‘.moisture ‘.will ‘.start ‘.to ‘.condense ‘.from ‘.the ‘.air ‘.is ‘.called... ‘.- ‘.(correct
‘.answer) ‘.-dew ‘.point ‘.temperature
a ‘.compound ‘.pressure ‘.gauge ‘.measures... ‘.- ‘.(correct ‘.answer) ‘.-pressure ‘.and ‘.vacuum
the ‘.main ‘.function ‘.of ‘.the ‘.condenser ‘.is ‘.to... ‘.- ‘.(correct ‘.answer) ‘.-To ‘.remove ‘.heat ‘.from ‘.the
‘.refrigerant
The ‘.heat ‘.removed ‘.from ‘.the ‘.refrigerant ‘.by ‘.the ‘.condenser ‘.is; ‘.- ‘.(correct ‘.answer) ‘.-Both ‘.sensible
‘.and ‘.latent ‘.heat.
in ‘.the ‘.evaporator... ‘.- ‘.(correct ‘.answer) ‘.-latent ‘.heat ‘.is ‘.transferred ‘.from ‘.the ‘.refrigerated ‘.space
‘.to ‘.the ‘.refrigerant
, an ‘.overcharge ‘.of ‘.refrigerant ‘.will ‘.cause... ‘.- ‘.(correct ‘.answer) ‘.-increased ‘.head ‘.pressure
the ‘.clearance ‘.space ‘.in ‘.a ‘.reciprocating ‘.compressor... ‘.- ‘.(correct ‘.answer) ‘.-has ‘.no ‘.effect ‘.on
‘.compressor ‘.capacity
which ‘.of ‘.the ‘.following ‘.types ‘.of ‘.air ‘.conditioning ‘.compressors ‘.is ‘.most ‘.energy ‘.efficient ‘.- ‘.
(correct ‘.answer) ‘.-centrifugal
the ‘.main ‘.function ‘.of ‘.the ‘.condenser ‘.is ‘.to... ‘.- ‘.(correct ‘.answer) ‘.-To ‘.remove ‘.heat ‘.from ‘.the
‘.refrigerant
Refrigerant ‘.R-134a ‘.vapor ‘.enters ‘.the ‘.condenser ‘.at ‘.124psig, ‘.100°F. ‘.it ‘.leaves ‘.the ‘.condenser ‘.at
‘.80°F. ‘.its ‘.pressure ‘.will ‘.be ‘.approximately... ‘.- ‘.(correct ‘.answer) ‘.-124psig
three ‘.basic ‘.types ‘.of ‘.condensers ‘.are ‘.water ‘.cooled, ‘.air ‘.cooled, ‘.and ‘.___ ‘.cooled. ‘.- ‘.(correct
‘.answer) ‘.-evaporative
10 ‘.lbs. ‘.of ‘.refrigerant ‘.passing ‘.through ‘.a ‘.water ‘.cooled ‘.condenser ‘.will ‘.lose ‘.20 ‘.btu's ‘.of ‘.heat
‘.per ‘.lb. ‘.if ‘.10lbs ‘.of ‘.water ‘.passes ‘.through ‘.the ‘.condenser ‘.with ‘.an ‘.entering ‘.air ‘.temperature ‘.of
‘.80°F. ‘.the ‘.temperature ‘.of ‘.the ‘.water ‘.leaving ‘.the ‘.condenser ‘.is... ‘.- ‘.(correct ‘.answer) ‘.-100°F
which ‘.of ‘.the ‘.following ‘.can ‘.not ‘.be ‘.used ‘.as ‘.a ‘.low ‘.ambient ‘.temperature ‘.control ‘.- ‘.(correct
‘.answer) ‘.-crankcase ‘.regulating ‘.valve
when ‘.testing ‘.the ‘.efficiency ‘.of ‘.an ‘.AIR ‘.COOLED ‘.condenser, ‘.the ‘.refrigerant ‘.condensing
‘.temperature ‘.should ‘.be ‘.no ‘.more ‘.than ‘.___ ‘.higher ‘.than ‘.the ‘.leaving ‘.air ‘.temperature ‘.- ‘.(correct
‘.answer) ‘.-approximately ‘.30°F
when ‘.testing ‘.the ‘.efficiency ‘.of ‘.a ‘.WATER ‘.COOLED ‘.condenser, ‘.the ‘.refrigerant ‘.condensing
‘.temperature ‘.should ‘.be ‘.no ‘.more ‘.than ‘.___ ‘.higher ‘.than ‘.the ‘.leaving ‘.water ‘.temperature ‘.- ‘.
(correct ‘.answer) ‘.-approximately ‘.10°F
the ‘.first ‘.function ‘.the ‘.condenser ‘.must ‘.perform ‘.is ‘.to ‘.___ ‘.the ‘.refrigerant ‘.before ‘.condensing
‘.can ‘.occur ‘.- ‘.(correct ‘.answer) ‘.-de-superheat
A ‘.TXV ‘.is ‘.designed ‘.to ‘.maintain... ‘.- ‘.(correct ‘.answer) ‘.-constant ‘.evaporator ‘.superheat
the ‘.AXV ‘.is ‘.designed ‘.to ‘.maintain... ‘.- ‘.(correct ‘.answer) ‘.-constant ‘.evaporator ‘.pressure
A ‘.TXV ‘.has ‘.three ‘.operating ‘.pressures... ‘.- ‘.(correct ‘.answer) ‘.-evaporator ‘.pressure, ‘.spring
‘.pressure, ‘.and ‘.suction ‘.bulb ‘.pressure
when ‘.mounting ‘.a ‘.TXV ‘.sensor ‘.bulb, ‘.which ‘.of ‘.the ‘.following ‘.is ‘.NOT ‘.true ‘.- ‘.(correct ‘.answer) ‘.-it
‘.must ‘.be ‘.installed ‘.lower ‘.than ‘.the ‘.valve ‘.body
in ‘.an ‘.air ‘.conditioning ‘.system ‘.that ‘.uses ‘.a ‘.thermostatic ‘.expansion ‘.valve, ‘.the ‘.temperature ‘.of
‘.the ‘.evaporator ‘.outlet ‘.will ‘.usually ‘.be... ‘.- ‘.(correct ‘.answer) ‘.-warmer ‘.than ‘.the ‘.evaporator ‘.inlet
