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9 Cards in this Set
- Front
- Back
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During sensible heating the dry bulb temperature and the wet bulb temperature are raised and the: 1) Dew point temperature increases 2) Dew point temperature decreases 3) Dew point remains unchanged 4) Specific humidity is increased 5) Specific humidity is decreased |
Dew point remains unchanged |
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During the summer, the majority of people feel comfortable when the effective temperature is between: 1) 17.2 and 21.7ºC 2) 15 and 19ºC 3) 20.5 and 24ºC 4) 19 and 24ºC 5) 16 and 19.5ºC |
19 and 24ºC |
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During the winter, the majority of people feel comfortable when the effective temperature is between: 1) 17.2 and 21.7ºC 2) 16 and 19.5ºC 3) 15 and 19ºC 4) 19 and 24ºC 5) 20.5 and 24ºC |
17.2 and 21.7ºC |
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Air used for ventilating purposes in an office building should be kept within a certain range of relative humidity as indicated below: 1) 30 to 50% 2) 40 to 50% 3) 50 to 60% 4) 10 to 30% 5) 30 to 70% |
30 to 70% |
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If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb and leaves the heating coil at 30°C dry bulb, what is the mass of air flowing? 1) 6.84 kg/s 2) 5.4 kg/s 3) 6.2 kg/s 4) 5.94 kg/s 5) 5.0 kg/s |
5.94 kg/s |
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Using the psychrometric chart, find the specific humidity if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C. 1) 0.0085 kg of water vapour per kg of dry air 2) 0.009 kg of water vapour per kg of dry air 3) 0.008 kg of water vapour per kg of dry air 4) 0.010 kg of water vapour per kg of dry air 5) 0.0085 kg of dry air per kg of water vapour |
0.0085 kg of water vapour per kg of dry air |
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Evaporative cooling is: 1) Heating and humidification of the air 2) Heating and dehumidification of the air 3) Cooling and dehumidification of the air 4) Cooling and humidification of the air 5) Cooling of air only |
Cooling and humidification of the air |
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If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb and leaves the heating coil at 30°C dry bulb, what is the heat output of the coil? 1) 51.7 kW 2) 59.4 kW 3) 65.2 kW 4) 52 kW 5) 42 kW |
59.4 kW |
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An increase in air flow increases heat loss of the body by which of the following methods: 1. Convection 2. Conduction 3. Evaporation 4. Radiation 1) 2 2) 1, 3 3) 1, 4 4) 1, 3, 4 5) 1, 2, 3 |
5) 1, 2, 3 |
