c
HVAC ESCO Basic Test ReviewWith complete Solution.
1. Multiple ccompressor csystems chave ca cequalization cline cto;
A. Maintain cequal cloads con call ccompressors
B. Maintain cequal coil clevels con call ccompressors.
C. Compensate cfor cdifferent cpressures cin cthe ccompressors.
D. Compensate cfor cevaporator cpressure cdrop.- cANS c- c c cA. cMaintain cequal
cloads con call ccompressors
2. The cpurpose cof ca cdouble csuction cline criser cis cto;
A. maintain cminimum crefrigerant cvelocities cunder cvarying cloads.
B. compensate cif cone csuction cfilter c- cdrier cbecomes cplugged.
C. prevent clow cpressure ctrips con cstart cup.
D. compensate cfor cevaporator cpressure cdrop.- cANS c- c c cA. cmaintain cminimum
crefrigerant cvelocities cunder cvarying cloads.
3. To cmeasure csuperheat, csubtract cthe;
A. low cside csaturation ctemperature cfrom cthe csuction cline ctemperature.
B. high cside ccondensing ctemperature cfrom cthe csuction cline ctemperature.
C. suction cline ctemperature cfrom cthe cambient ctemperature.
D. ambient ctemperature cfrom cthe csuction cline ctemperature- cANS c- c c cA. clow cside
csaturation ctemperature cfrom cthe csuction cline ctemperature.
4. An cair cconditioning csystem cis crunning cconstantly, cbut cnot ccooling cenough. cThe
csuction cline cis cvery ccold cand cthe ccompressor cis csweating. cThis cis can cindication
cof;
A.) clow crefrigerant ccharge cand cneeds cto cbe cleak ctested cand crepaired. cB.)
crestricted creturn cair cflow cor ca cdirty cevaporator
C. crestricted cair cflow cacross cthe ccondenser.
D.) cdamaged creturn cair cduct callowing cunconditioned cair cto cbe cdrawn cinto cthe
csystem.- cANS c- c c cB.) crestricted creturn cair cflow cor ca cdirty cevaporator
5. Why cmust ca ccooling ctower cor cevaporative ccondenser cbe cblown cdown cperiod-
cically?
A. The ccondenser cwater capproach cwill cbegin cto cnarrow.
B. Maintain cPH clevel cof cthe ccirculated cwater.
C. To crefresh ccooling ctower cor ccondenser cwith ccooler cmake-up cwater.
1 c/
,D.To cremove cconcentration cof cminerals cin cthe cwater.- cANS c- c c cD. cTo cremove
cconcentration cof cminerals cin cthe cwater.
6. A ccustomer creports cthat ctheir csystem chad cone cof cthree cfan cmotors creplaced
clast cweek cby canother cservice ccompany. cNow cthe cunit cis cnot ccooling cproperly
csince cthe coutdoor ctemperature chas crisen. cWhen cyou carrive cand cinspect cthe cunit,
cyou cfind cthat cdischarge cpressure cis cvery chigh. cOn cfurther cexamination, call
cmotors care crunning, cbut cthe camp cdraw cis cdifferent con cthe cnew cmotor cas
ccompared cto cthe cother ctwo cmotors. cThis cis cmost clikely cthe cresult cof- cANS c- c c
2 c/
, A. fan cmotor cis crunning cbackward
B. the cnew cmotor cis cgrossly cover csized.
C. a cdefective creplacement cmotor.
D. , cthe cfan cblade cwas cnot cchanged cto cmatch cthe cnew cmotor- cANS c- c c cB. cthe
cnew cmotor cis cgrossly cover csized.
7. When cpumping cdown ca ccondensing cunit cto ccheck cthe creciprocating ccom-
cpressor cvalves, cthe ccompressor
should cbe cable cto cachieve;
A. 10" cHg csuction cwith ca c300 cpsig chigh cside cpressure.
B. 30" cHg csuction cwhen cdischarging cto cthe catmosphere.
C. 24" cHg csuction cwith ca c100 cpsig chigh cside cpressure.
D. 24" cpsig csuction cwith ca c200 cpsig chigh cside cpressure.- cANS c- c c cB. c30" cHg
csuction cwhen cdischarging cto cthe catmosphere.
8. Direct cDigital cControl c(DCC) cis ca ccontrol cprocess cwhich cincorporates ca
cmicroprocessor, cacting cas ca cdigital ccontroller, cupdates ca cdata-base cof cinternal
cinformation cthrough;
A. reverse caction cof cPTC.
B. the ccommon cdigital cfeed.
C. the cuse cof cSensors.
D. the cuse cof cSim ccards.- cANS c- c c cC. cthe cuse cof cSensors.
9. If ca ccompressor chas ca csevere cburnout, cwhat caccessory cshould cbe cadded cto
cclean cthe csystem?
A. A cliquid cline cdrier.
B. An caccumulator.
C. A csuction cline cdrier.
D. An cacid ccore coil cseparator.- cANS c- c c cC. cA csuction cline cdrier.
10.The cscrew-type ccompressor coperates cat ca chigh cvolumetric cefficiency cbe-
ccause;
A. there cis cno cre-expansion cof crefrigerant cin cthe cclearance cspace.
B. they care ccapable cof cvery clow cspeed coperation.
C. capacity ccan cbe ccontrolled cdown cto c90%.
D. they care cused conly con csmall ccapacity csystems.- cANS c- c c cA. cthere cis cno cre-
expansion cof crefrigerant cin cthe cclearance cspace.
11.A crooftop cpackage csystem cis ccycling con cthe chigh cpressure ccontrol. cWhat
care cthree cpossible ccauses cfor cthis cproblem?
A. Condenser cair cbeing cre-circulated, cplugged cmetering cdevice, cor cunder-
ccharge.
B. Excessively cbent ccondenser cfins, ca cfaulty cpressure cswitch, cor cundercharge.
C. Dirty ccondenser, cincorrect crotation cof ccondenser cfan, cor cbad ccompressor
3 c/
HVAC ESCO Basic Test ReviewWith complete Solution.
1. Multiple ccompressor csystems chave ca cequalization cline cto;
A. Maintain cequal cloads con call ccompressors
B. Maintain cequal coil clevels con call ccompressors.
C. Compensate cfor cdifferent cpressures cin cthe ccompressors.
D. Compensate cfor cevaporator cpressure cdrop.- cANS c- c c cA. cMaintain cequal
cloads con call ccompressors
2. The cpurpose cof ca cdouble csuction cline criser cis cto;
A. maintain cminimum crefrigerant cvelocities cunder cvarying cloads.
B. compensate cif cone csuction cfilter c- cdrier cbecomes cplugged.
C. prevent clow cpressure ctrips con cstart cup.
D. compensate cfor cevaporator cpressure cdrop.- cANS c- c c cA. cmaintain cminimum
crefrigerant cvelocities cunder cvarying cloads.
3. To cmeasure csuperheat, csubtract cthe;
A. low cside csaturation ctemperature cfrom cthe csuction cline ctemperature.
B. high cside ccondensing ctemperature cfrom cthe csuction cline ctemperature.
C. suction cline ctemperature cfrom cthe cambient ctemperature.
D. ambient ctemperature cfrom cthe csuction cline ctemperature- cANS c- c c cA. clow cside
csaturation ctemperature cfrom cthe csuction cline ctemperature.
4. An cair cconditioning csystem cis crunning cconstantly, cbut cnot ccooling cenough. cThe
csuction cline cis cvery ccold cand cthe ccompressor cis csweating. cThis cis can cindication
cof;
A.) clow crefrigerant ccharge cand cneeds cto cbe cleak ctested cand crepaired. cB.)
crestricted creturn cair cflow cor ca cdirty cevaporator
C. crestricted cair cflow cacross cthe ccondenser.
D.) cdamaged creturn cair cduct callowing cunconditioned cair cto cbe cdrawn cinto cthe
csystem.- cANS c- c c cB.) crestricted creturn cair cflow cor ca cdirty cevaporator
5. Why cmust ca ccooling ctower cor cevaporative ccondenser cbe cblown cdown cperiod-
cically?
A. The ccondenser cwater capproach cwill cbegin cto cnarrow.
B. Maintain cPH clevel cof cthe ccirculated cwater.
C. To crefresh ccooling ctower cor ccondenser cwith ccooler cmake-up cwater.
1 c/
,D.To cremove cconcentration cof cminerals cin cthe cwater.- cANS c- c c cD. cTo cremove
cconcentration cof cminerals cin cthe cwater.
6. A ccustomer creports cthat ctheir csystem chad cone cof cthree cfan cmotors creplaced
clast cweek cby canother cservice ccompany. cNow cthe cunit cis cnot ccooling cproperly
csince cthe coutdoor ctemperature chas crisen. cWhen cyou carrive cand cinspect cthe cunit,
cyou cfind cthat cdischarge cpressure cis cvery chigh. cOn cfurther cexamination, call
cmotors care crunning, cbut cthe camp cdraw cis cdifferent con cthe cnew cmotor cas
ccompared cto cthe cother ctwo cmotors. cThis cis cmost clikely cthe cresult cof- cANS c- c c
2 c/
, A. fan cmotor cis crunning cbackward
B. the cnew cmotor cis cgrossly cover csized.
C. a cdefective creplacement cmotor.
D. , cthe cfan cblade cwas cnot cchanged cto cmatch cthe cnew cmotor- cANS c- c c cB. cthe
cnew cmotor cis cgrossly cover csized.
7. When cpumping cdown ca ccondensing cunit cto ccheck cthe creciprocating ccom-
cpressor cvalves, cthe ccompressor
should cbe cable cto cachieve;
A. 10" cHg csuction cwith ca c300 cpsig chigh cside cpressure.
B. 30" cHg csuction cwhen cdischarging cto cthe catmosphere.
C. 24" cHg csuction cwith ca c100 cpsig chigh cside cpressure.
D. 24" cpsig csuction cwith ca c200 cpsig chigh cside cpressure.- cANS c- c c cB. c30" cHg
csuction cwhen cdischarging cto cthe catmosphere.
8. Direct cDigital cControl c(DCC) cis ca ccontrol cprocess cwhich cincorporates ca
cmicroprocessor, cacting cas ca cdigital ccontroller, cupdates ca cdata-base cof cinternal
cinformation cthrough;
A. reverse caction cof cPTC.
B. the ccommon cdigital cfeed.
C. the cuse cof cSensors.
D. the cuse cof cSim ccards.- cANS c- c c cC. cthe cuse cof cSensors.
9. If ca ccompressor chas ca csevere cburnout, cwhat caccessory cshould cbe cadded cto
cclean cthe csystem?
A. A cliquid cline cdrier.
B. An caccumulator.
C. A csuction cline cdrier.
D. An cacid ccore coil cseparator.- cANS c- c c cC. cA csuction cline cdrier.
10.The cscrew-type ccompressor coperates cat ca chigh cvolumetric cefficiency cbe-
ccause;
A. there cis cno cre-expansion cof crefrigerant cin cthe cclearance cspace.
B. they care ccapable cof cvery clow cspeed coperation.
C. capacity ccan cbe ccontrolled cdown cto c90%.
D. they care cused conly con csmall ccapacity csystems.- cANS c- c c cA. cthere cis cno cre-
expansion cof crefrigerant cin cthe cclearance cspace.
11.A crooftop cpackage csystem cis ccycling con cthe chigh cpressure ccontrol. cWhat
care cthree cpossible ccauses cfor cthis cproblem?
A. Condenser cair cbeing cre-circulated, cplugged cmetering cdevice, cor cunder-
ccharge.
B. Excessively cbent ccondenser cfins, ca cfaulty cpressure cswitch, cor cundercharge.
C. Dirty ccondenser, cincorrect crotation cof ccondenser cfan, cor cbad ccompressor
3 c/
