Question 1

What is the movement of humidity through a building called?

Accepted Answer

A) Mass transfer 
B) Ventilation 
C) Natural or mechanical ventilation 
D) Condensation 
E) Evaporation 
A) Mass transfer 
B) Ventilation 
C) Natural or mechanical ventilation 
D) Condensation 
E) Evaporation A

Question 2

What drives moisture flow through a structure?

Accepted Answer

A) Percentage saturation difference 
B) Air temperature difference in oC d.b. 
C) Vapour pressure difference in Pascal's 
D) Air moisture content difference in kg H2O/kg dry air 
E) Wet bulb air temperature difference in oC w.b. 
A) Percentage saturation difference 
B) Air temperature difference in oC d.b. 
C) Vapour pressure difference in Pascal's 
D) Air moisture content difference in kg H2O/kg dry air 
E) Wet bulb air temperature difference in oC w.b. C

Question 3

Why does condensation occur within a building?

Accepted Answer

A) Users leave taps running, baths full, water evaporates and deposits onto room surfaces, making air moist 
B) Evaporated water within the building meets surfaces at below dew point temperature 
C) Kettles, cooking, fish tanks and open bowls of water evaporate more water vapour into room than ventilation can remove 
D) Porous building materials provide pathways for cold moisture to ingress a warm building and make indoor surfaces damp 
E) Cyclic variation of indoor surface temperatures always produces below dew point locations 
A) Users leave taps running, baths full, water evaporates and deposits onto room surfaces, making air moist 
B) Evaporated water within the building meets surfaces at below dew point temperature 
C) Kettles, cooking, fish tanks and open bowls of water evaporate more water vapour into room than ventilation can remove 
D) Porous building materials provide pathways for cold moisture to ingress a warm building and make indoor surfaces damp 
E) Cyclic variation of indoor surface temperatures always produces below dew point locations B

Question 4

In the context of condensation in building, what does Rv stand for?

Accepted Answer

A) Volumetric resistance of a material 
B) Resistance value 
C) Resistance volume 
D) Vapour resistivity 
E) Total vapour resistance 
A) Volumetric resistance of a material 
B) Resistance value 
C) Resistance volume 
D) Vapour resistivity 
E) Total vapour resistance

Question 5

How can a porous wall or roof have its' vapour resistance improved?

Accepted Answer

A) Replace with new materials 
B) Wallpaper internal surfaces 
C) Drill ventilation holes to ventilate structure 
D) Add a layer of polythene film 
E) Cannot be done so increase heating within building 
A) Replace with new materials 
B) Wallpaper internal surfaces 
C) Drill ventilation holes to ventilate structure 
D) Add a layer of polythene film 
E) Cannot be done so increase heating within building

Question 6

What is air, in terms of condensation risk?

Accepted Answer

A) Dry gas needed to ventilate humidity out of buildings 
B) Mixture of oxygen, nitrogen and carbon dioxide 
C) Mixture of dry gases and water vapour 
D) That which causes the problem 
E) Humans and animals breathe out humid air 
A) Dry gas needed to ventilate humidity out of buildings 
B) Mixture of oxygen, nitrogen and carbon dioxide 
C) Mixture of dry gases and water vapour 
D) That which causes the problem 
E) Humans and animals breathe out humid air

Question 7

Using a Psychrometric chart or a sketch of one, without calculation or use of tabulated data, which air condition do you expect to have a higher vapour pressure than the air in the room you are in now?

Accepted Answer

A) 35oC d.b., 32oC w.b. 
B) 20oC d.b., 50% Percentage Saturation 
C) 10oC d.b., 80% Percentage Saturation 
D) -5oC d.b., 100% Relative humidity 
E) 40oC d.b., 10% Percentage Saturation 
A) 35oC d.b., 32oC w.b. 
B) 20oC d.b., 50% Percentage Saturation 
C) 10oC d.b., 80% Percentage Saturation 
D) -5oC d.b., 100% Relative humidity 
E) 40oC d.b., 10% Percentage Saturation

Question 8

Why are thermal and dew point temperature gradients for a structure calculated and drawn?

Accepted Answer

A) Calculate thermal admittance of the structure 
B) Decide where additional thermal insulation or vapour barrier improves performance 
C) Discover dynamic behaviour of the structure 
D) No need to do it anymore as computers do all design 
E) Calculate optimum thickness of thermal insulation 
A) Calculate thermal admittance of the structure 
B) Decide where additional thermal insulation or vapour barrier improves performance 
C) Discover dynamic behaviour of the structure 
D) No need to do it anymore as computers do all design 
E) Calculate optimum thickness of thermal insulation

Question 9

Which are the units of moisture mass flow rate through a building structure used to calculate condensation risk?

Accepted Answer

A) kg/s 
B) kg/m2 s 
C) grammes/hour 
D) kPa/m2 
E) N s/kg 
A) kg/s 
B) kg/m2 s 
C) grammes/hour 
D) kPa/m2 
E) N s/kg

Question 10

Which is true?

Accepted Answer

A) MN s/g m = GN s/kg m 
B) 103 kN s/g m = GN s/kg m 
C) 103 N s/g =MN s/g 
D) 106 N s/kg = MN s/g 
E) kN s/kg = MN s/g 
A) MN s/g m = GN s/kg m 
B) 103 kN s/g m = GN s/kg m 
C) 103 N s/g =MN s/g 
D) 106 N s/kg = MN s/g 
E) kN s/kg = MN s/g

What is the movement of humidity through a building called?

What drives moisture flow through a structure?

Why does condensation occur within a building?

In the context of condensation in building, what does Rv stand for?

How can a porous wall or roof have its' vapour resistance improved?

What is air, in terms of condensation risk?

Using a Psychrometric chart or a sketch of one, without calculation or use of tabulated data, which air condition do you expect to have a higher vapour pressure than the air in the room you are in now?

Why are thermal and dew point temperature gradients for a structure calculated and drawn?

Which are the units of moisture mass flow rate through a building structure used to calculate condensation risk?

Which is true?

Climate Change

Post Occupancy

Built Environment

Energy Economics

Ventilation and Air Conditioning

Heat Demand

Heating

Water Services

Electrical Installations

Lighting

Room Acoustics

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Exam 11: Condensation in Buildings

What is the movement of humidity through a building called?

What drives moisture flow through a structure?

Why does condensation occur within a building?

In the context of condensation in building, what does Rv stand for?

How can a porous wall or roof have its' vapour resistance improved?

What is air, in terms of condensation risk?

Using a Psychrometric chart or a sketch of one, without calculation or use of tabulated data, which air condition do you expect to have a higher vapour pressure than the air in the room you are in now?

Why are thermal and dew point temperature gradients for a structure calculated and drawn?

Which are the units of moisture mass flow rate through a building structure used to calculate condensation risk?

Which is true?

Climate Change

Post Occupancy

Built Environment

Energy Economics

Ventilation and Air Conditioning

Heat Demand

Heating

Water Services

Electrical Installations

Lighting

Room Acoustics

Question Bank

Understanding Units

Filters