Air Conditioning Systems 2

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207909

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In extremely cold climates, it may be necessary to _________________________ in an HVAC system.

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207911

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HVAC control systems maintain minimum _______ air during periods of extreme high and low ambient temperature.

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207912

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When the outdoor air damper of an HVAC system opens to increase the flow of fresh air, the return air damper

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207915

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A main advantage of steam type humidifiers over pan type humidifiers is that

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207916

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When the outdoor air damper increases the flow of fresh air, which of the following is true?

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207917

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Dehumidification is achieved by:

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207918

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Which of the following is not a correct method of heat regulation?

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207920

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To control static pressure in the air ducts a differential pressure controller is installed. How does the controller control static pressure?

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207921

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To prevent too frequent starting and stopping of the compressor in a cooling system what should be done?

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207922

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To provide a two position damper, equipped with a fan that provides 100% outdoor air, with a ratio of damper opening what is required?

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207923

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When complete control systems become very complex, which control signal medium is preferred?

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207924

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In severely cold weather what adjustment must be made to properly preheat the outside air?

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207925

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Air conditioning with respect to heating coils is achieved in which of the following ways?

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207926

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In calculating air infiltration the quickest method is:

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207985

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Electric motors give off _________ while running.

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