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Which one of the following is not an HVAC control actuator:
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Sealed bellows is used in measuring in which of the following:
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______ operate on the principle that when a fluid flows around an obstruction in the flow stream
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Which of the following system can accommodate complex control and override schemes:
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In the ducts, pressure of the air falls because of which of the following:
A ______ duct with its high strength to weight ratio is suitable for distribution systems:
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