HVAC-R TEST: BASIC SCIENCE & A2L'S (TEST EDIT
1.22.23) QUESTIONS WITH ACCURATE ANSWERS
______________________ is used to classify a refrigerant according to the
potential hazards involved with its use, specifically toxicity and flammability
correct answer ASHRAE Standard 34
2L refrigerants have a burning velocity of ____________________________ or
less, making them less likely to sustain combustion after the initial ignition source
has been removed. correct answer 10 cm/s (3.9 inches per second)
A complex process that cleans, filters, and tests a refrigerant to meet the "like-
new" purity level specified in AHRI Standard 700 is; correct answer reclamation
A metric that is used to measure a refrigerant's environmental impact as a
greenhouse gas is; correct answer Global Warming Potential (GWP)
A refrigerant blend behaves like a single compound refrigerant is called a(n);
correct answer azeotropic blend
A refrigerant oil that is hygroscopic will; correct answer absorb moisture
A2L refrigerants have a flammability potential that is higher than; correct answer
A1 refrigerants
Always keep a Class ______, ______-powder, fire extinguisher on the jobsite and
use a refrigerant monitor during installation or service. correct answer Class B,
dry-powder
, Burning velocity correct answer the rate at which a flame front spreads relative to
the unburned gas ahead of the flame.
Class 2L refrigerants have a much ______ heat of combustion than A3
refrigerants. correct answer lower
Department of Transportation (DOT) standards require that a recovery tank
should not be fill beyond what percent of its capacity? correct answer 80%
DOT regulations require refrigerant cylinders containing over _____________ of a
2L refrigerant to be equipped with a pressure relief valve instead of a rupture
disc. correct answer 2.2 lbs.
DOT rules prohibit smoking within how many feet of a cylinder containing a
flammable gas? correct answer 25 feet
EPA Section 608 regulations require that if a system is charged with a flammable
refrigerant, the equipment must have? correct answer red, Pantone® Matching
System (PMS) markings on the service and access valves.
For most residential and light commercial heat pump and air conditioning systems
containing less than 200 pounds of either R-22 or R-410A, the required recovery
level is; correct answer 0 psig
HC refrigerants contain hydrogen and carbon and are classified by ASHRAE in the
A3 safety group. Due to their highly flammable nature, their use is limited to
1.22.23) QUESTIONS WITH ACCURATE ANSWERS
______________________ is used to classify a refrigerant according to the
potential hazards involved with its use, specifically toxicity and flammability
correct answer ASHRAE Standard 34
2L refrigerants have a burning velocity of ____________________________ or
less, making them less likely to sustain combustion after the initial ignition source
has been removed. correct answer 10 cm/s (3.9 inches per second)
A complex process that cleans, filters, and tests a refrigerant to meet the "like-
new" purity level specified in AHRI Standard 700 is; correct answer reclamation
A metric that is used to measure a refrigerant's environmental impact as a
greenhouse gas is; correct answer Global Warming Potential (GWP)
A refrigerant blend behaves like a single compound refrigerant is called a(n);
correct answer azeotropic blend
A refrigerant oil that is hygroscopic will; correct answer absorb moisture
A2L refrigerants have a flammability potential that is higher than; correct answer
A1 refrigerants
Always keep a Class ______, ______-powder, fire extinguisher on the jobsite and
use a refrigerant monitor during installation or service. correct answer Class B,
dry-powder
, Burning velocity correct answer the rate at which a flame front spreads relative to
the unburned gas ahead of the flame.
Class 2L refrigerants have a much ______ heat of combustion than A3
refrigerants. correct answer lower
Department of Transportation (DOT) standards require that a recovery tank
should not be fill beyond what percent of its capacity? correct answer 80%
DOT regulations require refrigerant cylinders containing over _____________ of a
2L refrigerant to be equipped with a pressure relief valve instead of a rupture
disc. correct answer 2.2 lbs.
DOT rules prohibit smoking within how many feet of a cylinder containing a
flammable gas? correct answer 25 feet
EPA Section 608 regulations require that if a system is charged with a flammable
refrigerant, the equipment must have? correct answer red, Pantone® Matching
System (PMS) markings on the service and access valves.
For most residential and light commercial heat pump and air conditioning systems
containing less than 200 pounds of either R-22 or R-410A, the required recovery
level is; correct answer 0 psig
HC refrigerants contain hydrogen and carbon and are classified by ASHRAE in the
A3 safety group. Due to their highly flammable nature, their use is limited to
