Question:
Which one of the following is not an air conditioning system?
Which one of the following is not an air conditioning system?
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Expansion system = a device, not a full AC system!
Updated On: Jul 3, 2025
- Unitary system
- Self-contained system
- Central station system
- Automatic expansion system
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The Correct Option is D
Solution and Explanation
Air conditioning systems are classified based on how air is cooled and distributed.
Unitary systems are small self-contained units like window ACs or split ACs used for single rooms.
Self-contained systems are similar — they have all components in one unit for individual zones.
Central station systems are large systems used to condition air for entire buildings using ducts.
An automatic expansion system is not an air conditioning system type — it refers to an automatic expansion valve used within a refrigeration cycle to regulate refrigerant flow.
So, it is a component, not a complete system for air conditioning.
Therefore, option (D) is correct.
Unitary systems are small self-contained units like window ACs or split ACs used for single rooms.
Self-contained systems are similar — they have all components in one unit for individual zones.
Central station systems are large systems used to condition air for entire buildings using ducts.
An automatic expansion system is not an air conditioning system type — it refers to an automatic expansion valve used within a refrigeration cycle to regulate refrigerant flow.
So, it is a component, not a complete system for air conditioning.
Therefore, option (D) is correct.
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