COSC 325 Exam #1 – 60 questions
and Answers
What is the property of a building material that allows water vapor to pass
through it? - - Permeability
- What is the elevation up to which very little error is introduced in the
information gathered using a psychrometric chart? - - 2000 feet above mean
sea level
- One grain equals - - 1/7000 lb
- What does psychrometrics deal with? - - Thermodynamic properties of air-
water vapor mixture
- What is meant by specific volume of air? - - Number of cubic feet occupied
by a pound of air
- A large part of winter heating energy for a building is used to remove
moisture from air. - - False
- What dry-bulb temperature most people prefer in summer? - - 75ºF
- What is the unit of measurement for specific volume of air? - - Cubic ft. per
lb of air
- What is the driving force in water vapor movement? - - Difference in vapor
pressure
- Which of the following actions may help to increase convective heat
losses? - - Increase in air motion
- Warm air cannot hold as much water vapor as cold air - - False
- What is convection? - - Circulation of gasses or liquid due to temperature
difference
- The values of at least ____ unrelated characteristics of an air-water vapor
mixture must be known in order to find out other characteristics using a
psychrometric chart - - 2
- What is the characteristic of an air/water vapor mixture that cannot be
found on a psychrometric chart? - - Equivalent temperature
and Answers
What is the property of a building material that allows water vapor to pass
through it? - - Permeability
- What is the elevation up to which very little error is introduced in the
information gathered using a psychrometric chart? - - 2000 feet above mean
sea level
- One grain equals - - 1/7000 lb
- What does psychrometrics deal with? - - Thermodynamic properties of air-
water vapor mixture
- What is meant by specific volume of air? - - Number of cubic feet occupied
by a pound of air
- A large part of winter heating energy for a building is used to remove
moisture from air. - - False
- What dry-bulb temperature most people prefer in summer? - - 75ºF
- What is the unit of measurement for specific volume of air? - - Cubic ft. per
lb of air
- What is the driving force in water vapor movement? - - Difference in vapor
pressure
- Which of the following actions may help to increase convective heat
losses? - - Increase in air motion
- Warm air cannot hold as much water vapor as cold air - - False
- What is convection? - - Circulation of gasses or liquid due to temperature
difference
- The values of at least ____ unrelated characteristics of an air-water vapor
mixture must be known in order to find out other characteristics using a
psychrometric chart - - 2
- What is the characteristic of an air/water vapor mixture that cannot be
found on a psychrometric chart? - - Equivalent temperature
