Exam (elaborations)
HVAC Excellence Commercial Air Conditioning ESCO Certification with Complete Solutions.
HVAC Excellence Commercial Air Conditioning ESCO Certification with Complete Solutions.
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HVAC Excellence Commercial Air Conditioning ESCO
Certification with Complete Solutions.
Multiple .compressor .systems .have .a .equalization .line .to;
A. .Maintain .equal .loads .on .all .compressors
B. .Maintain .equal .oil .levels .on .all .compressors.
C. .Compensate .for .different .pressures .in .the .compressors.
D. .Compensate .for .evaporator .pressure .drop. .- .(correct .answer) .-
A. .Maintain .equal .loads .on .all .compressors
The .purpose .of .a .double .suction .line .riser .is .to;
A. .maintain .minimum .refrigerant .velocities .under .varying .loads.
B. .compensate .if .one .suction .filter .- .drier .becomes .plugged.
C. .prevent .low .pressure .trips .on .start .up.
D. .compensate .for .evaporator .pressure .drop. .- .(correct .answer) .-
A. .maintain .minimum .refrigerant .velocities .under .varying .loads.
To .measure .superheat, .subtract .the;
A. .low .side .saturation .temperature .from .the .suction .line .temperature.
B. .high .side .condensing .temperature .from .the .suction .line .temperature.
C. .suction .line .temperature .from .the .ambient .temperature.
D. .ambient .temperature .from .the .suction .line .temperature .- .(correct .answer) .-A. .low .side .saturation
.temperature .from .the .suction .line .temperature.
An .air .conditioning .system .is .running .constantly, .but .not .cooling .enough. .The .suction .line .is .very .col
d .and .the .compressor .is .sweating. .This .is .an .indication .of;
,A.) .low .refrigerant .charge .and .needs .to .be .leak .tested .and .repaired.
B.) .restricted .return .air .flow .or .a .dirty .evaporator
C. .restricted .air .flow .across .the .condenser.
D.) .damaged .return .air .duct .allowing .unconditioned .air .to .be .drawn .into .the .system. .- .
(correct .answer) .-B.) .restricted .return .air .flow .or .a .dirty .evaporator
Why .must .a .cooling .tower .or .evaporative .condenser .be .blown .down .periodically?
A. .The .condenser .water .approach .will .begin .to .narrow.
B. .Maintain .PH .level .of .the .circulated .water.
C. .To .refresh .cooling .tower .or .condenser .with .cooler .make-up .water.
D. .To .remove .concentration .of .minerals .in .the .water. .- .(correct .answer) .-
D. .To .remove .concentration .of .minerals .in .the .water.
A .customer .reports .that .their .system .had .one .of .three .fan .motors .replaced .last .week .by .another .se
rvice .company. .Now .the .unit .is .not .cooling .properly .since .the .outdoor .temperature .has .risen. .When
.you .arrive .and .inspect .the .unit, .you .find .that .discharge .pressure .is .very .high. .On .further .examinatio
n, .all .motors .are .running, .but .the .amp .draw .is .different .on .the .new .motor .as .compared .to .the .oth
er .two .motors. .This .is .most .likely .the .result .of:
A. .fan .motor .is .running .backward
B. .the .new .motor .is .grossly .over .sized.
C. .a .defective .replacement .motor.
D., .the .fan .blade .was .not .changed .to .match .the .new .motor .- .(correct .answer) .-
B. .the .new .motor .is .grossly .over .sized.
When .pumping .down .a .condensing .unit .to .check .the .reciprocating .compressor .valves, .the .compress
or
should .be .able .to .achieve;
A. .10" .Hg .suction .with .a .300 .psig .high .side .pressure.
B. .30" .Hg .suction .when .discharging .to .the .atmosphere.
C. .24" .Hg .suction .with .a .100 .psig .high .side .pressure.
D. .24" .psig .suction .with .a .200 .psig .high .side .pressure. .- .(correct .answer) .-
B. .30" .Hg .suction .when .discharging .to .the .atmosphere.
, Direct .Digital .Control .
(DCC) .is .a .control .process .which .incorporates .a .microprocessor, .acting .as .a .digital .controller, .update
s .a .data-base .of .internal .information .through;
A. .reverse .action .of .PTC.
B. .the .common .digital .feed.
C. .the .use .of .Sensors.
D. .the .use .of .Sim .cards. .- .(correct .answer) .-C. .the .use .of .Sensors.
If .a .compressor .has .a .severe .burnout, .what .accessory .should .be .added .to .clean .the .system?
A. .A .liquid .line .drier.
B. .An .accumulator.
C. .A .suction .line .drier.
D. .An .acid .core .oil .separator. .- .(correct .answer) .-C. .A .suction .line .drier.
The .screw-type .compressor .operates .at .a .high .volumetric .efficiency .because;
A. .there .is .no .re-expansion .of .refrigerant .in .the .clearance .space.
B. .they .are .capable .of .very .low .speed .operation.
C. .capacity .can .be .controlled .down .to .90%.
D. .they .are .used .only .on .small .capacity .systems. .- .(correct .answer) .-A. .there .is .no .re-
expansion .of .refrigerant .in .the .clearance .space.
A .rooftop .package .system .is .cycling .on .the .high .pressure .control. .What .are .three .possible .causes .fo
r .this .problem?
A. .Condenser .air .being .re-circulated, .plugged .metering .device, .or .undercharge.
B. .Excessively .bent .condenser .fins, .a .faulty .pressure .switch, .or .undercharge.
C. .Dirty .condenser, .incorrect .rotation .of .condenser .fan, .or .bad .compressor .valves.
D. .Dirty .condenser, .bent .condenser .fins, .or .air .re-circulated .over .the .condenser. .- .(correct .answer) .-
D. .Dirty .condenser, .bent .condenser .fins, .or .air .re-circulated .over .the .condenser.
An .true .azeotropic .refrigerant .blend .is .one .which;
A .must .be .charged .into .the .system .as .a .liquid.