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9 Cards in this Set
- Front
- Back
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Air washers used in air conditioning systems: 1) Only humidify, cool and clean the air 2) Only clean the air 3) Humidify, heat, cool, dehumidify, and clean the air 4) Only clean and cool the air 5) Only humidify and dehumidify the air |
Humidify, heat, cool, dehumidify, and clean the air |
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Pan type humidifiers with plates: 1) Consist of rotating plates in a pan partially filled with water 2) Consist of a shallow pan partially filled with water in which absorbent plates are placed and the pan is installed in the supply plenum of smaller warm air furnaces 3) Can be a power type or a bypass type 4) Are placed in individual rooms to humidify the individual rooms 5) Consist of plates in a pan through which water is sprayed by a spinning disc or cone |
Consist of a shallow pan partially filled with water in which absorbent plates are placed and the pan is installed in the supply plenum of smaller warm air furnaces |
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Wetted element humidifiers: 1) Have a lower humidification rate than the pan type humidifiers 2) Are the same as pan type humidifiers 3) Have stationary plates placed in a tray and placed in individual rooms 4) Can be either the power type or the bypass type 5) Are the same as the atomising humidifier |
Can be either the power type or the bypass type |
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Which is not a method employed to maintain the desired temperature of the spray water in air washers used in air conditioning systems? 1) Part of the spray water is recirculated and hot or clod water is added as required 2) The spray water is recirculated through a heat exchanger and is heated by hot water 3) The spray water if recirculated through a heat exchanger and is cooled by chilled water 4) A heating or cooling coil is directly mounted in the sump of the washer 5) An electric heater and fan |
An electric heater and fan |
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Air washers used in air conditioning systems achieve heating and humidification by: 1) Cooling the spray water to a temperature below the dew point of the entering air 2) Cooling the spray water to a temperature below the dry bulb temperature 3) Heating the entering air above its dry bulb temperature 4) Cooling the entering air below its dry bulb temperature 5) Heating the spray water to a temperature above the dry bulb temperature of the entering air |
Heating the spray water to a temperature above the dry bulb temperature of the entering air |
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Humidifying units that use a small fan to draw warmer air from the furnace plenum or from the room force the air through the wetted pad and return the air to the room, are called: 1) Bypass type humidifiers 2) Atomising humidifiers 3) Industrial pan type steam grid humidifiers 4) Pan type humidifiers with plates 5) Power type wetted element humidifiers |
Power type wetted element humidifiers |
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Which of the following is not a result of very low humidity? 1) Wood furniture and floor squeaks and crack 2) Throat and nose membranes drying up 3) At sufficiently high room temperatures people still feel cool 4) Evaporation of moisture on the skin decreases 5) Static electricity build-up |
Evaporation of moisture on the skin decreases |
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It is not recommended to use an on-off switch for steam grid humidifiers for which of the following reasons? 1) Wide fluctuations in relative humidity would occur 2) Fogging would occur 3) Overheating would occur 4) Misting would occur 5) All of the above |
All of the above |
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Humidity in the air: 1) Remains constant with air temperature changes 2) Decreases when the air temperature decreases 3) Increases when the air pressure decreases 4) Decreases when the air pressure increases 5) Increases when the air temperature decreases |
Increases when the air temperature decreases |
