COSC 325 – Choudhury Questions &
Answersn
True or False: Magnitude of radiant heat transfer between two objects is dependent on the
temperature difference between source and receiver Correct Ans-True
The factors that contribute to both sensible and latent heat gains are ________ and outside air.
Correct Ans-Indoor, people, human beings, cooking
What index is used to measure the tendency of a material to oppose heat flow? Correct Ans-R
value
What index is used to measure the tendency of a material to conduct heat flow? Correct Ans-
U value
What is the effect of reflective surfaces on heat transfer? Correct Ans-They reduce radiated
heat transfer
Lighting loads add heat to a building at the rate of ______ per watt Correct Ans-3.4
What statement is true for total heat grain through glass? Correct Ans-Total heat gain through
glass is a sum of both solar and conducted gains
,What makes the flow of conducted heat to slow down through most insulation materials
Correct Ans-Internal air spaces of the insulation
What is the driving force for heat flow? Correct Ans-Difference in temperature
What are the factors that contribute to latent heat gain? Correct Ans-People and outdoor air
What is HSPF Correct Ans-An index of heating efficiency of a residential heat pump
How much heat is delivered by a resistance heater? Correct Ans-3400 BTU per kilowatt
What are the major factors on which the efficiency of a combustion heating equipment depends?
Correct Ans-Correct Air-fuel ratio and lowering of flue heat losses
What are the three different types of hydronic heat exchangers? Correct Ans-Convector,
Radiant surface, and forced air
Why can a heat pump operate as economically as a combustion equipment in mild climates?
Correct Ans-It takes free heat from outdoor envronment
When does condensation occur on a building component's surface? Correct Ans-When the
surface temperature is lower than the dew point temperature of the ambient air/water vapor
mixture
, What air/water vapor mixture characteristic cannot be read from a psychrometric chart?
Correct Ans-Equivalent temperature
What is an indicator of the total heat in an air/water vapor mixture? Correct Ans-Wet-bulb
temperature
True or False: Warm air cannot hold as much water vapor as cold air. Correct Ans-False
Why do you have to know the temperature inside a composite roof or wall? Correct Ans-To
figure out where to install vapor barrier
True or False: Heat loss from a building is both sensible and latent Correct Ans-False
What factor does not contribute to a building's heat gain in summer? Correct Ans-External
lighting
What is not considered an internal load? Correct Ans-Indoor air
True or False: Latent heat exists in the water vapor carried by air Correct Ans-True
How can water be used as a refrigerant? Correct Ans-By lowering its boiling temperature in a
deep vacuum
Answersn
True or False: Magnitude of radiant heat transfer between two objects is dependent on the
temperature difference between source and receiver Correct Ans-True
The factors that contribute to both sensible and latent heat gains are ________ and outside air.
Correct Ans-Indoor, people, human beings, cooking
What index is used to measure the tendency of a material to oppose heat flow? Correct Ans-R
value
What index is used to measure the tendency of a material to conduct heat flow? Correct Ans-
U value
What is the effect of reflective surfaces on heat transfer? Correct Ans-They reduce radiated
heat transfer
Lighting loads add heat to a building at the rate of ______ per watt Correct Ans-3.4
What statement is true for total heat grain through glass? Correct Ans-Total heat gain through
glass is a sum of both solar and conducted gains
,What makes the flow of conducted heat to slow down through most insulation materials
Correct Ans-Internal air spaces of the insulation
What is the driving force for heat flow? Correct Ans-Difference in temperature
What are the factors that contribute to latent heat gain? Correct Ans-People and outdoor air
What is HSPF Correct Ans-An index of heating efficiency of a residential heat pump
How much heat is delivered by a resistance heater? Correct Ans-3400 BTU per kilowatt
What are the major factors on which the efficiency of a combustion heating equipment depends?
Correct Ans-Correct Air-fuel ratio and lowering of flue heat losses
What are the three different types of hydronic heat exchangers? Correct Ans-Convector,
Radiant surface, and forced air
Why can a heat pump operate as economically as a combustion equipment in mild climates?
Correct Ans-It takes free heat from outdoor envronment
When does condensation occur on a building component's surface? Correct Ans-When the
surface temperature is lower than the dew point temperature of the ambient air/water vapor
mixture
, What air/water vapor mixture characteristic cannot be read from a psychrometric chart?
Correct Ans-Equivalent temperature
What is an indicator of the total heat in an air/water vapor mixture? Correct Ans-Wet-bulb
temperature
True or False: Warm air cannot hold as much water vapor as cold air. Correct Ans-False
Why do you have to know the temperature inside a composite roof or wall? Correct Ans-To
figure out where to install vapor barrier
True or False: Heat loss from a building is both sensible and latent Correct Ans-False
What factor does not contribute to a building's heat gain in summer? Correct Ans-External
lighting
What is not considered an internal load? Correct Ans-Indoor air
True or False: Latent heat exists in the water vapor carried by air Correct Ans-True
How can water be used as a refrigerant? Correct Ans-By lowering its boiling temperature in a
deep vacuum
