ESCO Air Conditioning
(Refrigeration Systems)
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First
Attempt!! Current Update!!
1. Heat that causes a change in temperature of a substance is called:
A. Latent heat
B. Sensible heat
C. Superheat
D. Specific heat
Correct Answer: B. Sensible heat
2. Heat added to a substance without a change in temperature is known as:
A. Sensible heat
B. Superheat
C. Latent heat
D. Conductive heat
Correct Answer: C. Latent heat
3. Heat added to refrigerant vapor after the evaporation process is called:
A. Subcooling
B. Latent heat
C. Superheat
D. Sensible heat
Correct Answer: C. Superheat
,4. Scroll compressors move refrigerant by means of:
A. Pistons
B. Rotary vanes
C. Involute spirals
D. Centrifugal force
Correct Answer: C. Involute spirals
5. The transfer of heat by fluid motion is known as:
A. Conduction
B. Radiation
C. Convection
D. Evaporation
Correct Answer: C. Convection
6. Heat transfer through direct contact between substances is called:
A. Convection
B. Radiation
C. Conduction
D. Evaporation
Correct Answer: C. Conduction
7. The standard unit used to measure heat energy is:
A. PSI
B. BTU
C. Watts
D. Joules
Correct Answer: B. BTU
,8. Refrigerant releases heat when it:
A. Evaporates
B. Expands
C. Condenses
D. Compresses
Correct Answer: C. Condenses
9. Why must refrigerant in the suction line be slightly warmer than saturation temperature?
A. To improve efficiency
B. To reduce pressure
C. To prevent liquid slugging
D. To increase flow
Correct Answer: C. Prevent liquid slugging
10. The refrigerant in the suction line should be:
A. High pressure liquid
B. Low pressure liquid
C. Low pressure, low temperature vapor
D. High pressure vapor
Correct Answer: C. Low pressure vapor
11. Refrigerant entering the condenser is typically:
A. Low pressure liquid
B. Low temperature vapor
C. High pressure, highly superheated vapor
D. Saturated liquid
Correct Answer: C. High pressure superheated vapor
12. The primary function of an evaporator is to:
, A. Reject heat
B. Compress refrigerant
C. Absorb heat from the conditioned space
D. Store refrigerant
Correct Answer: C. Absorb heat
13. Which of the following is NOT a thermodynamic property of refrigerants?
A. Pressure
B. Temperature
C. Flammability
D. Enthalpy
Correct Answer: C. Flammability
14. What is the correct sequence of the vapor compression cycle?
A. Expansion, Compression, Condensation, Evaporation
B. Compression, Condensation, Expansion, Evaporation
C. Condensation, Expansion, Compression, Evaporation
D. Evaporation, Compression, Condensation, Expansion
Correct Answer: B. Compression → Condensation → Expansion → Evaporation
15. A cylinder of R-410A stored at 70°F will have an approximate pressure of:
A. 100 psig
B. 150 psig
C. 201 psig
D. 300 psig
Correct Answer: C. 201 psig
16. Fan airflow pressures are commonly measured in:
A. PSI
B. Inches of mercury
(Refrigeration Systems)
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First
Attempt!! Current Update!!
1. Heat that causes a change in temperature of a substance is called:
A. Latent heat
B. Sensible heat
C. Superheat
D. Specific heat
Correct Answer: B. Sensible heat
2. Heat added to a substance without a change in temperature is known as:
A. Sensible heat
B. Superheat
C. Latent heat
D. Conductive heat
Correct Answer: C. Latent heat
3. Heat added to refrigerant vapor after the evaporation process is called:
A. Subcooling
B. Latent heat
C. Superheat
D. Sensible heat
Correct Answer: C. Superheat
,4. Scroll compressors move refrigerant by means of:
A. Pistons
B. Rotary vanes
C. Involute spirals
D. Centrifugal force
Correct Answer: C. Involute spirals
5. The transfer of heat by fluid motion is known as:
A. Conduction
B. Radiation
C. Convection
D. Evaporation
Correct Answer: C. Convection
6. Heat transfer through direct contact between substances is called:
A. Convection
B. Radiation
C. Conduction
D. Evaporation
Correct Answer: C. Conduction
7. The standard unit used to measure heat energy is:
A. PSI
B. BTU
C. Watts
D. Joules
Correct Answer: B. BTU
,8. Refrigerant releases heat when it:
A. Evaporates
B. Expands
C. Condenses
D. Compresses
Correct Answer: C. Condenses
9. Why must refrigerant in the suction line be slightly warmer than saturation temperature?
A. To improve efficiency
B. To reduce pressure
C. To prevent liquid slugging
D. To increase flow
Correct Answer: C. Prevent liquid slugging
10. The refrigerant in the suction line should be:
A. High pressure liquid
B. Low pressure liquid
C. Low pressure, low temperature vapor
D. High pressure vapor
Correct Answer: C. Low pressure vapor
11. Refrigerant entering the condenser is typically:
A. Low pressure liquid
B. Low temperature vapor
C. High pressure, highly superheated vapor
D. Saturated liquid
Correct Answer: C. High pressure superheated vapor
12. The primary function of an evaporator is to:
, A. Reject heat
B. Compress refrigerant
C. Absorb heat from the conditioned space
D. Store refrigerant
Correct Answer: C. Absorb heat
13. Which of the following is NOT a thermodynamic property of refrigerants?
A. Pressure
B. Temperature
C. Flammability
D. Enthalpy
Correct Answer: C. Flammability
14. What is the correct sequence of the vapor compression cycle?
A. Expansion, Compression, Condensation, Evaporation
B. Compression, Condensation, Expansion, Evaporation
C. Condensation, Expansion, Compression, Evaporation
D. Evaporation, Compression, Condensation, Expansion
Correct Answer: B. Compression → Condensation → Expansion → Evaporation
15. A cylinder of R-410A stored at 70°F will have an approximate pressure of:
A. 100 psig
B. 150 psig
C. 201 psig
D. 300 psig
Correct Answer: C. 201 psig
16. Fan airflow pressures are commonly measured in:
A. PSI
B. Inches of mercury
