Unit A, Objective 3

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

• To absorb heat into the refrigeration system.

• To compress the refrigerant.

• To expel heat from the system.

• To circulate refrigerant.

Which component changes the low-pressure vapor to high pressure vapor in a refrigeration cycle?

• Compressor

• Condenser

• Expansion valve

• Evaporator

What is subcooling in a refrigeration cycle?

• Heating of liquid refrigerant at constant pressure below its boiling point.

• Cooling of liquid refrigerant at constant pressure below its boiling point.

• Cooling of vapor refrigerant at constant pressure.

• Heating of vapor refrigerant at constant temperature.

Which type of refrigerant is most commonly used in modern residential air conditioning systems?

• R-22

• R-134a

• R-410A

• R-32

What does the term 'superheat' refer to in refrigeration?

• The temperature of the vapor refrigerant above its saturation temperature.

• The pressure of the refrigerant above its critical point.

• The subcooling process in the condenser.

• The expansion of refrigerant in the evaporator.

Which device in a refrigeration system is responsible for reducing the pressure of the refrigerant?

• Compressor

• Condenser

• Expansion valve

• Evaporator

What role does the condenser play in a refrigeration cycle?

• It absorbs heat from the refrigerant.

• It releases heat to the surroundings.

• It compresses the refrigerant vapor.

• It controls the flow of refrigerant.

What is a primary consideration when designing an HVAC system for a commercial building?

• Aesthetic appearance

• Maximum occupancy

• Energy efficiency

• Color of the equipment

Which factor is not typically considered in HVAC load calculations?

• Number of windows

• Color of the walls

• Insulation levels

• Building orientation

What is the purpose of zoning in an HVAC system?

• To ensure uniform air distribution

• To control temperatures in different areas independently

• To increase the system's energy consumption

• To reduce the number of air handlers required