ASF Refrigeration Systems and Heat Transfer 2

Question 1

Which type of heat transfer is primarily responsible for distributing cold temperatures inside a refrigerator through air circulation?

Accepted Answer

Convection

Answer

Convection involves heat transfer through the movement of air; cold air circulating inside the refrigerator removes heat from food items through convection currents.

Question 2

What is the main purpose of the condenser in a refrigeration system?

Accepted Answer

To reject heat from the refrigerant to the surrounding environment

Answer

The condenser removes heat from the high-pressure refrigerant vapor, causing it to condense into a liquid while releasing that heat to the surrounding environment.

Question 3

In a frost-free refrigerator, what component initiates the automatic defrost cycle to remove ice from the evaporator?

Accepted Answer

The defrost timer or control board

Answer

The defrost timer or electronic control board activates the defrost heater on a timed or adaptive schedule to melt accumulated frost from the evaporator coils.

Question 4

What is the primary function of the filter-drier in a refrigeration system?

Accepted Answer

To remove moisture and contaminants from the refrigerant

Answer

The filter-drier removes moisture, acid, and debris from the refrigerant to prevent ice blockages at the expansion device and protect system components from corrosion.

Question 5

What is the function of a capillary tube in a refrigeration system?

Accepted Answer

To act as a fixed metering device controlling refrigerant flow

Answer

A capillary tube is a fixed-restriction metering device that controls the flow rate of liquid refrigerant from the high-pressure side to the low-pressure side.

(ASF) Appliance Service Fundamentals Certification Practice Test

(ASF) Appliance Service Fundamentals Certification Practice Test

ASF Refrigeration Systems and Heat Transfer 2