COSC 325 Exam 1/40 questions with
Answers
Warm air cannot hold as much water vapor as cold air - - True
- Which one of the following air/water vapor mixture characteristics cannot
be read from a psychrometric chart? - - Equivalent temperature
- Which one of the following is an indicator of the TOTAL heat in an air/water
vapor mixture? - - Wet-bulb temperature
- Vapor barriers are installed on or near the ______ side of a construction. - -
Warm
- What is the quantity of water that will consume or release 1 BTU of heat
when heated up or cooled down by 1°F? - - 1 pound
- What is convection? - - Circulation of gases or liquid due to temperature
difference
- Most body heat losses are: - - Convective, evaporative, and radiant
- What dry-bulb temperature most people prefer in summer? - - 75°F
- What is the driving force for water vapor movement? - - Difference in
vapor pressure
- When does condensation occur on a building component's surface? - -
When the surface temperature is lower than the dew point temperature of
the ambient air/water vapor mixture
- What index is used to measure the tendency of a material to conduct heat
flow? - - U value
- Which one of the following could be a factor for infiltration of outside air
into buildings? - - Temperature differences b/t inside and outside air
- The rate of air change per hour (ACH) in a building is 0.75. What does it
mean? - - 75 per cent of air in the building is replaced every hour
- External wall of a building has a U value of 0.5. What does it mean? - - 0.5
BTUH of heat will flow through 1 sq. ft. area of the wall for a temperature
difference of 1⁰F
Answers
Warm air cannot hold as much water vapor as cold air - - True
- Which one of the following air/water vapor mixture characteristics cannot
be read from a psychrometric chart? - - Equivalent temperature
- Which one of the following is an indicator of the TOTAL heat in an air/water
vapor mixture? - - Wet-bulb temperature
- Vapor barriers are installed on or near the ______ side of a construction. - -
Warm
- What is the quantity of water that will consume or release 1 BTU of heat
when heated up or cooled down by 1°F? - - 1 pound
- What is convection? - - Circulation of gases or liquid due to temperature
difference
- Most body heat losses are: - - Convective, evaporative, and radiant
- What dry-bulb temperature most people prefer in summer? - - 75°F
- What is the driving force for water vapor movement? - - Difference in
vapor pressure
- When does condensation occur on a building component's surface? - -
When the surface temperature is lower than the dew point temperature of
the ambient air/water vapor mixture
- What index is used to measure the tendency of a material to conduct heat
flow? - - U value
- Which one of the following could be a factor for infiltration of outside air
into buildings? - - Temperature differences b/t inside and outside air
- The rate of air change per hour (ACH) in a building is 0.75. What does it
mean? - - 75 per cent of air in the building is replaced every hour
- External wall of a building has a U value of 0.5. What does it mean? - - 0.5
BTUH of heat will flow through 1 sq. ft. area of the wall for a temperature
difference of 1⁰F
