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Room air conditioners and packaged units are examples of _________

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Room air conditioners and packaged units are examples of _________

(a) Direct expansion systems

(b) Indirect expansion systems

(c) Chilled water systems

(d) Indirect contraction systems

I had been asked this question during an internship interview.

My query is from Systems and Essentials of Air Conditioning System in section Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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Right choice is (a) Direct expansion systems

For explanation: Air conditioning systems are classified into two categories. These are direct expansion systems and chilled water systems. Room air conditioners and packaged units are examples of direct expansion systems.

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