HVAC Star Exam With Correct Questions
And Answers 2024
In ba bchiller, bthe brefrigerant bboils bby b___________. b- bcorrect banswer.absorbing bheat
bfrom bthe bwater bpassing bthrough bit
The bfour bmain bcomponents bof ba brefrigeration bsystem bare b- bcorrect banswer.compressor,
bcondenser, bevaporator, b& bmetering bdevice
The bdifference bbetween ba bcontactor band ba bmotor bstarter bis: b- bcorrect banswer.overload
bprotection
If brefrigerant bcondenses bat ba btemperature bof b105 bdegrees bF band bthe bwater bleaves bthe
bcondenser bat ba btemperature bof b95 bdegrees bF, bthe b___________. b- bcorrect
banswer.condenser bapproach btemperature bwill bbe b10 bdegrees
The bdevice bthat bis bincorporated binto ba bvacuum bsteam bheating bsystem bto bprotect bthe
bvacuum bpump bfrom bcreating btoo blow b(deep) ba bvacuum bis ba: b- bcorrect banswer.vacuum
bbreaker
The bapproach btemperature bfor bthe bevaporator bis: b- bcorrect banswer.the bdifference bin bthe
brefrigerant bboiling btemperature band bthe bleaving-water btemperature
The brotation bof ba bthree-phase bmotor bcan bbe breversed bby binterchanging: b- bcorrect
banswer.any btwo bleads
Absolute bzero bis: b- bcorrect banswer.-460 bdegrees bF
When ba bthree-phase bmotor bsingle-phases, bit: b- bcorrect banswer.draws bpower bfrom bonly
bone bphase
If byou bwant bto breplace ba bdefective bcapacitor bbut bthe bonly breplacements byou bcan bfind bdo
bnot bhave benough bcapacitance, byou bcan bincrease btheir bcapacitance bby: b- bcorrect
banswer.connecting btwo bor bmore bcapacitors bin bparallel
A bsingle-phase bmotor bin bwhich bthe bstarting bcapacitor bremains bconnected bwhen bthe
bmotor bruns bis bcalled ba: b- bcorrect banswer.permanent-split bcapacitor bmotor
, When busing ba bthermostatic bexpansion bvalve bwith ba b__________ bcharged belement,
bhunting bcan bbe bconsiderably breduced. b- bcorrect banswer.cross
A bhand bplaced bnear ba bhot bstove bor bfireplace bis bquickly bheated bby: b- bcorrect
banswer.radiation
When ban bobject bis brefrigerated: b- bcorrect banswer.heat bis bremoved bfrom bit.
The brefrigerant bline bthat bconnects bthe bcondenser bto bthe bmetering bdevice bis
b___________ bline. b- bcorrect banswer.liquid
In ba bthree-phase bsystem, bthe bvoltage bimbalance bbetween bany btwo blegs bmay bnot bvary
bby bmore bthan: b- bcorrect banswer.2%
A blamp bsource bhas ba bvoltage bof b110 bvolts band ba bcurrent bof b0.9 bamperes. bWhat bis bthe
bresistance bof bthe blamp? b- bcorrect banswer.122.2ohms
Lithium-Bromide bis bused bin babsorption bsystems bas: b- bcorrect banswer.a bsalt bsolution
an babsorbent b(attractant)
a bsolution bthat bcreates ba bpressure bdifference
(((all bof bthe babove))))
The bamount bof bheat bremoved bto blower bthe btemperature bof b15 blbs bof bwater bfrom b48
bdegrees bF bto b39 bdegrees bF bis: b- bcorrect banswer.135 bBtu.
Heat bflows bdownhill. bThis bmeans: b- bcorrect banswer.it bnaturally bflows bfrom bwarmer bto
bcolder bsubstance.
When bwater bis bintroduced binto bthe bend bof ba bchiller bit bis bcontained bin: b- bcorrect
banswer.water bboxes
Atmospheric bpressure bat bsea blevel bis: b- bcorrect banswer.14.7 bpsi
Refrigerant bleaves bthe bcompressor bthrough bthe b___________ bline. b- bcorrect
banswer.discharge bline
What bis bthe bmaximum ballowable bcurrent bimbalance brating bin ba bthree-phase bsupply? b-
bcorrect banswer.10%
A bdual-element bfuse bhas: b- bcorrect banswer.a bthermal bcutout band ba bnormal bfuse blink
Electricity bresults bfrom bthe bmovement bof btiny bnegatively bcharged bparticles bcalled b-
bcorrect banswer.electrons
And Answers 2024
In ba bchiller, bthe brefrigerant bboils bby b___________. b- bcorrect banswer.absorbing bheat
bfrom bthe bwater bpassing bthrough bit
The bfour bmain bcomponents bof ba brefrigeration bsystem bare b- bcorrect banswer.compressor,
bcondenser, bevaporator, b& bmetering bdevice
The bdifference bbetween ba bcontactor band ba bmotor bstarter bis: b- bcorrect banswer.overload
bprotection
If brefrigerant bcondenses bat ba btemperature bof b105 bdegrees bF band bthe bwater bleaves bthe
bcondenser bat ba btemperature bof b95 bdegrees bF, bthe b___________. b- bcorrect
banswer.condenser bapproach btemperature bwill bbe b10 bdegrees
The bdevice bthat bis bincorporated binto ba bvacuum bsteam bheating bsystem bto bprotect bthe
bvacuum bpump bfrom bcreating btoo blow b(deep) ba bvacuum bis ba: b- bcorrect banswer.vacuum
bbreaker
The bapproach btemperature bfor bthe bevaporator bis: b- bcorrect banswer.the bdifference bin bthe
brefrigerant bboiling btemperature band bthe bleaving-water btemperature
The brotation bof ba bthree-phase bmotor bcan bbe breversed bby binterchanging: b- bcorrect
banswer.any btwo bleads
Absolute bzero bis: b- bcorrect banswer.-460 bdegrees bF
When ba bthree-phase bmotor bsingle-phases, bit: b- bcorrect banswer.draws bpower bfrom bonly
bone bphase
If byou bwant bto breplace ba bdefective bcapacitor bbut bthe bonly breplacements byou bcan bfind bdo
bnot bhave benough bcapacitance, byou bcan bincrease btheir bcapacitance bby: b- bcorrect
banswer.connecting btwo bor bmore bcapacitors bin bparallel
A bsingle-phase bmotor bin bwhich bthe bstarting bcapacitor bremains bconnected bwhen bthe
bmotor bruns bis bcalled ba: b- bcorrect banswer.permanent-split bcapacitor bmotor
, When busing ba bthermostatic bexpansion bvalve bwith ba b__________ bcharged belement,
bhunting bcan bbe bconsiderably breduced. b- bcorrect banswer.cross
A bhand bplaced bnear ba bhot bstove bor bfireplace bis bquickly bheated bby: b- bcorrect
banswer.radiation
When ban bobject bis brefrigerated: b- bcorrect banswer.heat bis bremoved bfrom bit.
The brefrigerant bline bthat bconnects bthe bcondenser bto bthe bmetering bdevice bis
b___________ bline. b- bcorrect banswer.liquid
In ba bthree-phase bsystem, bthe bvoltage bimbalance bbetween bany btwo blegs bmay bnot bvary
bby bmore bthan: b- bcorrect banswer.2%
A blamp bsource bhas ba bvoltage bof b110 bvolts band ba bcurrent bof b0.9 bamperes. bWhat bis bthe
bresistance bof bthe blamp? b- bcorrect banswer.122.2ohms
Lithium-Bromide bis bused bin babsorption bsystems bas: b- bcorrect banswer.a bsalt bsolution
an babsorbent b(attractant)
a bsolution bthat bcreates ba bpressure bdifference
(((all bof bthe babove))))
The bamount bof bheat bremoved bto blower bthe btemperature bof b15 blbs bof bwater bfrom b48
bdegrees bF bto b39 bdegrees bF bis: b- bcorrect banswer.135 bBtu.
Heat bflows bdownhill. bThis bmeans: b- bcorrect banswer.it bnaturally bflows bfrom bwarmer bto
bcolder bsubstance.
When bwater bis bintroduced binto bthe bend bof ba bchiller bit bis bcontained bin: b- bcorrect
banswer.water bboxes
Atmospheric bpressure bat bsea blevel bis: b- bcorrect banswer.14.7 bpsi
Refrigerant bleaves bthe bcompressor bthrough bthe b___________ bline. b- bcorrect
banswer.discharge bline
What bis bthe bmaximum ballowable bcurrent bimbalance brating bin ba bthree-phase bsupply? b-
bcorrect banswer.10%
A bdual-element bfuse bhas: b- bcorrect banswer.a bthermal bcutout band ba bnormal bfuse blink
Electricity bresults bfrom bthe bmovement bof btiny bnegatively bcharged bparticles bcalled b-
bcorrect banswer.electrons
