Basics of Mechanical Engineering

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MCQ ~ Psychrometry

1. A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
  • Dry air
  • Moist air
  • Saturated air
  • Specific humidity
2. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in it, is called
  • Wet bulb temperature
  • Dry bulb temperature
  • Dew point temperature
  • None of these
3. For unsaturated air, the dew point temperature is ........... wet bulb temperature.
  • Equal to
  • Less than
  • More than
4. The difference between dry bulb temperature and wet bulb temperature, is called
  • Dry bulb depression
  • Wet bulb depression
  • Dew point depression
  • Degree of saturation
5. During sensible cooling of air, the specific humidity
  • Increases
  • Decreases
  • Remains constant
6. During sensible cooling of air, the dry bulb temperature
  • Increases
  • Decreases
  • Remains constant
7. During sensible cooling of air, the wet bulb temperature
  • Increases
  • Decreases
  • Remains constant
8. The process generally used in winter air conditioning to warm and humidify the air, is called
  • Humidification
  • Dehumidification
  • Heating and humidification
  • Cooling and dehumidification
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