Exam (elaborations)
COMMERCIAL REFRIGERATION FINAL TEST WITH ALL ANSWERS 100- correct.
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COMMERCIAL REFRIGERATION FINAL TEST WITH ALL ANSWERS 100- correct.
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Light bCommercial bA/CStudy bonline bat
bhttps://quizlet.com/_a6vq2t
1. Condenser bfan-cycling bcontrols bhave bthe bsame
is bused bto
baction bas ba blow-pressure bcontrol, bexcept bit:
bcontrol bthe
2. A bsling bpsychrometer bis bused bto bmeasure bwet band bhigh bpressure.
bdry bbulb btemperatures. bThe bdifference bbetween
wet bbulb
bthe btwo breadings bis:
bdepres- bsion.
3. Some bcompressors bare bfitted bwith ban bunloading
bde- bvice bto:
provide
bvariable
bcapacity.
4. Compressor bnet boil bpressure bis bdetermined bby: oil bpump bdis-
charge
bpressure
bminus bthe
bsuction
bpressure.
5. A bcompressor bis boperating bwith ba bdischarge 5:1
bpressure bof b185.3 bpsig band ba bsuction bpressure bof
b25.3 bpsig. bThe bcompression bratio b(pumping bratio)
bis:
electroni
6. Which btype bof bmetering bdevice bcan bbe bused bto c bstep-
bmeter brefrigerant band bcontrol bsystem bpump bdown
motor
bwithout ba bliquid bline bsolenoid bvalve?
expansion
bvalve.
7. The bcapacity bof ba bcooling btower bdepends bon bthe: entering bair bwet
bulb btemperature.
8. When bthe bwet band bdry bbulb btemperatures bare
bthe bsame, bthe brelative bhumidity bwould bbe:
10. On bsplit
9. Refrigerant bin bthe bsuction bline bshould bbe bslightly bsystem
bsu- bperheated bin border bto: binstallations
, bthe bsuction
bline bshould
1 b/
, Light bCommercial bA/C
Study bonline bat
bbe bpitched btowards bthe bcompressor bat bleast:
bhttps://quizlet.com/_a6vq2t
100%
11. The bmost breliable band bsafest bmethod bof bfield
bcharging ba bblended brefrigerant binto ba bsystem bis
insure bliquid
bto bcharge:
brefrig- berant
bdoes bnot ben-
bter bthe
bcompres- bsor.
one binch bper
bten bfeet. b(1
bin/10 bft)
by bweighing bin
bthe bcorrect
bamount bof
brefrigerant.
2 b/
, Light bCommercial bA/C
Study bonline bat
bhttps://quizlet.com/_a6vq2t
12. Approximately bhow bmuch bairflow bis brequired b to
bacross bthe bevaporator bper bton bof bcooling bassure
bcapacity? bproper boil
breturn.
13. The bamount bof bheat babsorbed bin bthe
bevaporator bis bequal bto bthe bheat:
14. If ba bTEV bsensing bbulb blost bits bcharge, bwhat
beffect bwould bthis bhave bon bthe bair bconditioning
bsystem? bIt bwould bcause bthe:
15. A bdecrease bin bwater bflow, bwhen busing ba bwater
bcooled bcondenser:
16. High bcompressor boperating btemperatures bcan
bbe bcaused bby:
17. What bis bthe bpurpose bof ba bdistributor? bIt bevenly
bfeeds brefrigerant bto:
18. Upon binvestigation bof ba b"no bcooling" bcomplaint,
bthe btechnician bfinds bthat bthe bblower bmotor bof bthe
bair bhan- bdler bhas bno bopen bwindings. bOne bweek
bago, bthis bsame bunit bwas bfound bto bhave ba bbroken
bbelt bcaused bby ba bworn bdrive bpulley. bBoth bthe bbelt
band bpulley bwere breplaced bat bthat btime. bWhich bof
bthe bfollowing bshould bbe bdone bwhen bthe
btechnician breplaces bthe bmotor?
19. Over-night, bwith blower bthan bnormal bambient
btemper- batures, ban bair bconditioning bunit bhas bthe
bsuction bline biced bup bto bthe bcompressor. bWhat
bwould bbe bthe bmost bprobable bcause?
20. Depending bon bthe bapplication, bsuction blines bmust
bbe
3 b/
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