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Refrigeration ESCO EXAM 2024/2025 with Complete Solutions.
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Refrigeration ESCO EXAM with Complete Solutions.
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Refrigeration ESCO EXAM 2024-2025with 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 .tempera
ture .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 .sh
ould .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 .evap
orator .outlet .will .usually .be... .- .(correct .answer) .-warmer .than .the .evaporator .inlet
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