ESCO Light Commercial Refrigeration EXAM
with Complete Solutions
In ta tdry ttype t(direct texpansion) tevaporator, tliquid trefrigerant tmust tboil taway tas tclose tto tthe tend
tof tthe tcoil tas tpossible tin torder tto:
A. toperate tat thigh tefficiency.
B. tensure tthat tfrost tdoes tnot taccumulate.
C. tsub-cool tthe tcompressor.
D. tensure tproper toil treturn. t- tAnswer t- t t tA. toperate tat thigh tefficiency.
The tdifference tbetween tthe ttemperature tof tthe trefrigerant tboiling tin tthe tevaporator tand tthe
ttemperature tat tthe tevaporator toutlet tis tknown tas:
A. tevaporator tsuperheat.
B. tlatent theat.
C. tevaporator tsub-cooling.
D. tsublimation. t- tAnswer t- t t tA. tevaporator tsuperheat.
An texpansion tdevice tthat tis tstuck topen twill tcause:
A. tlow tsuction tpressure
B. ta tstarved tevaporator.
C. texcessive tsuperheat
D. ta tflooded tevaporator t- tAnswer t- t t tD. ta tflooded tevaporator
When tmeasuring tevaporator tsuperheat ton ta tcommercial tsystem tthat thas ta tlong tsuction tline, tthe
tpressure treading tshould tbe ttaken tat tthe:
A. tcompressor tinlet.
,B. tevaporator toutlet.
C. tcondenser toutlet.
D. treceiver tInlet. t- tAnswer t- t t tA. tcompressor tinlet. t(Suction tLine)
Superheat tmeasurements tare tbest ttaken:
A. tduring ta thot tpull tdown.
B. tat t8°F tto t12°F.
C. tduring tdefrost.
D. twith tthe tsystem toperating tat tdesign tconditions. t- tAnswer t- t t tD. twith tthe tsystem toperating tat
tdesign tconditions.
A ttechnician tis tchecking tthe tsuperheat ton ta tmulti tcircuit tevaporator tand tfinds tone tof tthe tcircuits
thas ta tsuperheat tthat tis thigher tthan tthe tothers. tThis tcould tbe tcaused tby:
A. ta tdirty tcoil.
B. ta trefrigerant tovercharge
C. tuneven tair tdistribution.
D. ta tblocked tdistributor. t- tAnswer t- t t tD. ta tblocked tdistributor.
A tTEV twith tan texternal tequalizer tis tused ton:
A. tevaporators twith ta thigh tpressure tdrop.
B. tevaporators twith ta tlow tpressure tdrop.
C. thigh ttemperature tapplications tonly.
D. tall tevaporators. t- tAnswer t- t t tA. tevaporators twith ta thigh tpressure tdrop.
D. tthe tTEV t- tAnswer t- t t tC. tthe tcirculator
What ttime tinterval tis trequired tbetween teach tsuperheat tadjustment?
A. tNot tless tthan t1 thour
B. tAbout t10-15 tminutes
C. tAt tleast t1/2 thour.
D. tNo ttime tdelay. t- tAnswer t- t t tB. tAbout t10-15 tminutes
A tlow ttemperature tevaporator tused tfor tcooling tspace tor tproduct trefrigeration:
A. tis tthe tsame tas tone tused tfor tmedium tor thigh ttemperatures.
B. tmust thave tfins tspaced tcloser ttogether.
C. tmust tbe tfrosted tperiodically.
D. tmust tbe tdefrosted tperiodically. t- tAnswer t- t t tD. tmust tbe tdefrosted tperiodically.
Some tspecial tapplications tuse ta tflooded tevaporator t(operated tfull tof trefrigerant). tIn torder tto
tmaintain tthe tproper tlevel tof tliquid trefrigerant, ta t____ ttype tmetering tdevice tis tused.
A. tTEV t
B. tcapillary ttube
C. tAEV
D. tfloat t- tAnswer t- t t tD. tfloat
A tproperly tfunctioning tcondenser twill tfirst:
A. tcondense tthen tde-superheat.
B. tsubcool tthen tde-superheat.
C. tsubcool tthen tsuperheat.
D. tde-superheat tthen tsubcool. t- tAnswer t- t t tD. tde-superheat tthen tsubcool.
Tube twithin ta ttube, tshell tand tcoil, tand tshell tand ttube tare tall ttypes tof: t
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