REFRIGERATION ENGINEER LICENSE
EXAM (SPECIALTY LICENSING)
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. Which refrigerant property primarily determines the cooling effect in an
evaporator?
A. Density
B. Viscosity
C. Latent heat of vaporization
D. Molecular weight
Rationale: **Latent heat of vaporization represents the amount of heat
absorbed during phase change, which provides the cooling effect.
2. What component meters refrigerant flow into the evaporator in most
systems?
A. Compressor
B. Condenser
C. Expansion valve
D. Receiver
Rationale: **The expansion valve controls refrigerant flow and pressure
drop into the evaporator.
3. Which compressor type is most commonly used in small commercial
refrigeration?
A. Centrifugal
B. Screw
C. Reciprocating
D. Axial
, Rationale: **Reciprocating compressors are reliable and economical for
small to medium capacities.
4. Superheating refrigerant vapor at the evaporator outlet ensures:
A. Higher condensing pressure
B. Liquid refrigerant to compressor
C. No liquid enters the compressor
D. Increased subcooling
Rationale: **Superheat ensures complete vaporization, protecting the
compressor from liquid slugging.
5. What happens to refrigerant pressure as it passes through the expansion
device?
A. Increases
B. Remains constant
C. Decreases sharply
D. Becomes vacuum
Rationale: **The expansion device causes a sharp pressure drop, enabling
evaporation.
6. Which heat exchanger rejects heat to the surroundings?
A. Evaporator
B. Condenser
C. Receiver
D. Accumulator
Rationale: **The condenser rejects absorbed heat to air or water.
7. Oil return to the compressor is critical to prevent:
A. High head pressure
B. Flooding
C. Compressor wear
D. Refrigerant loss
Rationale: **Lack of oil return causes lubrication failure and mechanical
damage.
8. Which refrigerant classification indicates low toxicity and no flame
propagation?
A. B3
, B. A3
C. A1
D. B2
Rationale: **A1 refrigerants are low toxicity and non-flammable.
9. The primary function of a receiver is to:
A. Store oil
B. Separate moisture
C. Store liquid refrigerant
D. Control pressure
Rationale: **Receivers store excess liquid refrigerant.
10.What causes high head pressure in an air-cooled condenser?
A. Low ambient temperature
B. Dirty condenser coil
C. Low refrigerant charge
D. Oversized evaporator
Rationale: **Restricted airflow reduces heat rejection, raising head
pressure.
11.Subcooling refers to refrigerant that is:
A. Vapor above saturation
B. Liquid cooled below saturation temperature
C. Flash gas
D. Mixed phase
Rationale: **Subcooling ensures liquid refrigerant reaches the expansion
device.
12.Which instrument measures refrigerant pressure?
A. Thermometer
B. Manifold gauge
C. Anemometer
D. Hygrometer
Rationale: **Manifold gauges measure system pressures.
13.What is the normal state of refrigerant entering the compressor?
A. Liquid
B. Low-pressure vapor
EXAM (SPECIALTY LICENSING)
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. Which refrigerant property primarily determines the cooling effect in an
evaporator?
A. Density
B. Viscosity
C. Latent heat of vaporization
D. Molecular weight
Rationale: **Latent heat of vaporization represents the amount of heat
absorbed during phase change, which provides the cooling effect.
2. What component meters refrigerant flow into the evaporator in most
systems?
A. Compressor
B. Condenser
C. Expansion valve
D. Receiver
Rationale: **The expansion valve controls refrigerant flow and pressure
drop into the evaporator.
3. Which compressor type is most commonly used in small commercial
refrigeration?
A. Centrifugal
B. Screw
C. Reciprocating
D. Axial
, Rationale: **Reciprocating compressors are reliable and economical for
small to medium capacities.
4. Superheating refrigerant vapor at the evaporator outlet ensures:
A. Higher condensing pressure
B. Liquid refrigerant to compressor
C. No liquid enters the compressor
D. Increased subcooling
Rationale: **Superheat ensures complete vaporization, protecting the
compressor from liquid slugging.
5. What happens to refrigerant pressure as it passes through the expansion
device?
A. Increases
B. Remains constant
C. Decreases sharply
D. Becomes vacuum
Rationale: **The expansion device causes a sharp pressure drop, enabling
evaporation.
6. Which heat exchanger rejects heat to the surroundings?
A. Evaporator
B. Condenser
C. Receiver
D. Accumulator
Rationale: **The condenser rejects absorbed heat to air or water.
7. Oil return to the compressor is critical to prevent:
A. High head pressure
B. Flooding
C. Compressor wear
D. Refrigerant loss
Rationale: **Lack of oil return causes lubrication failure and mechanical
damage.
8. Which refrigerant classification indicates low toxicity and no flame
propagation?
A. B3
, B. A3
C. A1
D. B2
Rationale: **A1 refrigerants are low toxicity and non-flammable.
9. The primary function of a receiver is to:
A. Store oil
B. Separate moisture
C. Store liquid refrigerant
D. Control pressure
Rationale: **Receivers store excess liquid refrigerant.
10.What causes high head pressure in an air-cooled condenser?
A. Low ambient temperature
B. Dirty condenser coil
C. Low refrigerant charge
D. Oversized evaporator
Rationale: **Restricted airflow reduces heat rejection, raising head
pressure.
11.Subcooling refers to refrigerant that is:
A. Vapor above saturation
B. Liquid cooled below saturation temperature
C. Flash gas
D. Mixed phase
Rationale: **Subcooling ensures liquid refrigerant reaches the expansion
device.
12.Which instrument measures refrigerant pressure?
A. Thermometer
B. Manifold gauge
C. Anemometer
D. Hygrometer
Rationale: **Manifold gauges measure system pressures.
13.What is the normal state of refrigerant entering the compressor?
A. Liquid
B. Low-pressure vapor
