CFESA Refrigeration Systems

Question 1

What is the primary refrigerant used in most modern commercial food equipment refrigeration systems?

Accepted Answer

R-404A

Answer

R-404A is widely used in commercial food refrigeration due to its compatibility with medium and low temperature applications.

Question 2

Which component in a refrigeration system is responsible for removing heat from the refrigerant?

Accepted Answer

Condenser

Answer

The condenser releases heat absorbed by the refrigerant to the surrounding environment, completing the refrigeration cycle.

Question 3

What does superheat indicate in a refrigeration system?

Accepted Answer

Temperature rise of vapor above its saturation point

Answer

Superheat is the number of degrees the refrigerant vapor is above the boiling point at a given pressure, ensuring no liquid enters the compressor.

Question 4

A technician measures a high head pressure and normal suction pressure in a walk-in cooler. The most likely cause is:

Accepted Answer

Dirty condenser coils

Answer

Dirty condenser coils restrict airflow and heat transfer, causing head pressure to rise above normal operating range.

Question 5

What is the purpose of a receiver in a commercial refrigeration system?

Accepted Answer

Store extra refrigerant and ensure liquid feed to the expansion device

Answer

The receiver stores liquid refrigerant to accommodate system load variations and ensures a steady liquid supply to the expansion device.

CFESA - Commercial Food Equipment Service Association Practice Test