Exam (elaborations)
COMMERCIAL REFRIGERATION FINAL TEST WITH ALL ANSWERS
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COMMERCIAL REFRIGERATION FINAL TEST WITH ALL ANSWERS
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COMMERCIALREFRIGERATION FINAL
TEST WITH ALL
ANSWERS
How vis vthe vcooling veffect vin va vmechanical vrefrigeration vsystem vproduced? v-
vcorrect vanswer-Evaporation vof vliquid vrefrigerant vinto vvapor
What vis vthe vprimary vpurpose vof va vcompressor? v- vcorrect vanswer-It vcirculates
vand vpressurizes vthe vrefrigerant vvapor vbefore vthe vvapor vIs vcondensed vfor vre
vuse
Name vanother vfunction vthat vmust vbe vperformed vby vthe vcompressor v- vcorrect
vanswer-Is vraise vthe vpressure vand vtemperature vof vthe vrefrigerant vvapor. vThis
vallows vthe vrefrigerant vto vcondense vinto va vliquid vas vit vcirculates vthrough vthe
vcondenser
What vcharacteristic vdefines van v"open" vtype vcompressor? v- vcorrect vanswer-Has
va vdrive vshaft vprotruding vfrom vthe vcompressor
, What vare vthe vtwo vmain vdisadvantages vof va vhermetic vcompressor? v- vcorrect
vanswer-If veither vthe vmotor vor vcompressor vmalfunctions, vthe ventire vunit vmust vbe
vreplaced. vThe vmotor vis vactually va vpart vof vthe vrefrigerant vcirculation vsystem.
vThis vmeans vthat va vburnout vcan vcontaminate vthe ventire vsystem
In va vreciprocating vcompressor, vthe vpiston vis vconnected vto vthe vcrankshaft vby va
v_____ v- vcorrect vanswer-Connecting vrod
Name vthe vthree velements vof vperformance vthat vare vthe vmajor vfactors vin
vevaluating va vcompressor v- vcorrect vanswer-Efficiency, vcapacity, vand veconomy vof
voperation
If vthe vsuction vgas vsuperheat vis vtoo vlow, vWhat vcould vbe vthe vresult? v- vcorrect
vanswer-Liquid vrefrigerant vmight venter vthe vcompressor. vThis vcauses vstress von
vthe vcompressor vvalves, vwrist vpins, vrods, vshaft, vetc. vIt valso vcauses vexcessive
vfoaming vof vthe voil vin vthe vcrankcase vand vother vdamaging veffects. vThe
vcompressor vwill vnot vreach vits vrated vcapacity
What vwill vhappen vif vthe vsuction vgas vtemperature vis vtoo vhigh? v- vcorrect vanswer-
Will vcause vthe vcompressor vto vrun vhot
How vis vcompressor vefficiency voften vjudged? v- vcorrect vanswer-Btu vper vcubic vfoot
v(Btu/ft^3) vof vdisplacement
When vthe vsame vmodel vof vopen vtype vcompressor vis vused vwith vboth vair vcooled
vand vwater vcooled vcondensing vunits, vwhich vis vusually vrun vat va vslightly vhigher
vrpm? v- vcorrect vanswer-Water vcooled
What vis vthe vequation vfor vratio vof vcompression? v- vcorrect vanswer-The vabsolute
vdischarge vpressure v(psig vplus v14.7) vdivided vby vthe vabsolute vsuction vpressure
v(psig vplus v14.7)
What vtype vof vcompressor vis vfound vin vlarge vapplications vup vto v10000 vtons? v-
vcorrect vanswer-Centrifugal vcompressors
Which vcompressor vutilizes vtwo vhelical vrotors vto vcompress vthe vrefrigerant vgas? v-
vcorrect vanswer-Screw vcompressor
What vis vthe vmost voutstanding vadvantage vof vthe vhermetically vsealed vcompressor
vover vthe vopen vtype? v- vcorrect vanswer-Has vno vprotruding vcrankshaft vor vshaft
vseal
How vare vthe vdisadvantages vovercome vin vcompressors vthat vare vemployed vin
vlow vtemperature vapplications? v- vcorrect vanswer-Use vsupplementary vcooling
How vare vthe vdisadvantages vovercome vin vwater vcooled vhermetic vcompressor
vsystems? v- vcorrect vanswer-Have vwater vjackets, vor vwater vcoils varound vthe
vcompressor/motor vshell vor vhousing
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