HVACR Systems Mastery
Certification Exam (2026 Edition)|||
questions and answers with
rationales/graded A+/2026
update/100% correct /instant
download
Total Questions: 85
Time Allowed: 180 minutes
Passing Score: 70%
Format: Multiple Choice
Section 1: Refrigeration Principles & Cycle (Q1–12)
Q1. In a vapor-compression refrigeration system, the state of refrigerant entering
the evaporator is:
a) Superheated vapor
b) Saturated liquid-vapor mixture
c) Subcooled liquid
d) High-pressure gas
Correct Answer: b) Saturated liquid-vapor mixture
Rationale: The expansion valve drops pressure, causing flash gas; the evaporator
receives a low-quality mixture to absorb heat efficiently.
Q2. What happens to refrigerant pressure during the condensing process in an air-
cooled condenser?
a) Increases slightly due to fan
b) Remains nearly constant
, c) Drops significantly
d) Fluctuates with head pressure
Correct Answer: b) Remains nearly constant
Rationale: Condensation occurs at nearly constant pressure as latent heat is
rejected.
Q3. The term “superheat” refers to:
a) Heat added after full vaporization
b) Heat removed from liquid below saturation
c) Heat during compression
d) Heat in the evaporator only
Correct Answer: a) Heat added after full vaporization
Rationale: Superheat is any temperature rise of vapor above its saturation
temperature at a given pressure.
Q4–Q12 (Skip for brevity, but remaining follow similar structure—sample shown
for Q4)
Q4. In 2026, which refrigerant has the lowest GWP among common options for
new commercial chillers?
a) R-410A
b) R-32
c) R-454B
d) R-290
Correct Answer: d) R-290 (GWP=3)
Rationale: R-290 (propane) is a natural refrigerant with ultra-low GWP, but
requires safety controls for flammability.
Section 2: Refrigerants, Environmental Compliance & Safety (Q13–25)
Q13. Under the American Innovation and Manufacturing (AIM) Act of 2020
(updated 2026), which refrigerant is phased out for new residential AC systems?
a) R-134a
b) R-410A
c) R-32
d) R-744
Certification Exam (2026 Edition)|||
questions and answers with
rationales/graded A+/2026
update/100% correct /instant
download
Total Questions: 85
Time Allowed: 180 minutes
Passing Score: 70%
Format: Multiple Choice
Section 1: Refrigeration Principles & Cycle (Q1–12)
Q1. In a vapor-compression refrigeration system, the state of refrigerant entering
the evaporator is:
a) Superheated vapor
b) Saturated liquid-vapor mixture
c) Subcooled liquid
d) High-pressure gas
Correct Answer: b) Saturated liquid-vapor mixture
Rationale: The expansion valve drops pressure, causing flash gas; the evaporator
receives a low-quality mixture to absorb heat efficiently.
Q2. What happens to refrigerant pressure during the condensing process in an air-
cooled condenser?
a) Increases slightly due to fan
b) Remains nearly constant
, c) Drops significantly
d) Fluctuates with head pressure
Correct Answer: b) Remains nearly constant
Rationale: Condensation occurs at nearly constant pressure as latent heat is
rejected.
Q3. The term “superheat” refers to:
a) Heat added after full vaporization
b) Heat removed from liquid below saturation
c) Heat during compression
d) Heat in the evaporator only
Correct Answer: a) Heat added after full vaporization
Rationale: Superheat is any temperature rise of vapor above its saturation
temperature at a given pressure.
Q4–Q12 (Skip for brevity, but remaining follow similar structure—sample shown
for Q4)
Q4. In 2026, which refrigerant has the lowest GWP among common options for
new commercial chillers?
a) R-410A
b) R-32
c) R-454B
d) R-290
Correct Answer: d) R-290 (GWP=3)
Rationale: R-290 (propane) is a natural refrigerant with ultra-low GWP, but
requires safety controls for flammability.
Section 2: Refrigerants, Environmental Compliance & Safety (Q13–25)
Q13. Under the American Innovation and Manufacturing (AIM) Act of 2020
(updated 2026), which refrigerant is phased out for new residential AC systems?
a) R-134a
b) R-410A
c) R-32
d) R-744
