Exam (elaborations)
ABYC Air Conditioning & Refridgeration Certification Exam Review
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ABYC Air Conditioning & Refridgeration Certification Exam Review
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While phasing out R-22, other gases can cause serious damage, except which one?
a. HFC-134a
b. R417A
c. R-12
d. None of the above
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b. R417A
,Air handling units (AKA "heat exchanger, Coil, or evaporator units) installed at floor
level must be ducted so as to discharge air
a. At waist level or above
b. At floor level under 10 feet away from unit
c. At floor level over 10 feet away from unit
d. Goes overboard
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a. At waist level or above
Once pressure tested, for how long afterward may a refrigerant recovery cylinder be
used without re-testing?
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5 years
Air in the condenser or an air-cooled condenser with dust-clogged cooling fins can
cause what?
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Excessive compressor head pressure
To convert Watts into BTU's, the Watts should be multiplied by:
A. 3.41
,B. 4.4
C. 22
D. 34
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A. 3.41
Capacitors must be within ______ percent if you need to replace them
a. 10
b. 15
c. 20
d. 25
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a. 10
Using a high-quality dual-stage vacuum pump, about how many hours will it take to
fully evacuate a small A/C system and remove all moisture (~29.72" or 5,000 microns)
at 70 degrees F?
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~4 hours
A system has low suction and discharge pressure, but high superheat and partial
frosting on the evaporator. What is probably wrong:
a. System blockage
, b. Too much refrigerant in system
c. Not enough refrigerant in system
d. System needs maintenance/cleaning
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c. Not enough refrigerant in system
The amount of BTU's needed per square foot to cool a mid-deck space in the pacific
northwest is;
a. 60
b. 90
c. 120
d. 150
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b. 90
The decrease in pressure due to friction of a fluid or vapor as it passes through a tube
or duct and/or lift.
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Pressure Drop
1 BTU per hour is equal to how many Watts?
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