Arch 463
ECS
Midterm II
Fall 98

30 Multiple Choice Questions

1. Passive cooling techniques that work in all climates include 
	A. shading
	B. ventilation
	C. daylighting
	D. all of the above

2. During a sunny summer day at 40º NL, the 4’ x 4’ aperture that will experience the most solar gain is located on
	A. a flat roof
	B. the east elevation
	C. the south elevation
	D. the west elevation

3. A fixed, exterior shading device that is ineffective for a north façade in Bozeman, MT, is
	A. horizontal
	B. egg-crate
	C. vertical
	D. all of the above—no shading is needed 

4. Thermal winds are most important on a site that is located
	A. at 45º NL
	B. near a valley
	C. at 30º NL
	D. all of the above

5. A building with a shed roof that slopes down toward the prevailing wind will usually provide an eddy zone that is relatively
	A. short and turbulent
	B. short and calm
	C. long and calm
	D. long and turbulent

6. The best scheme for using natural ventilation in a room that has two windows on the same wall (and no other windows) is to
	A. provide to casement windows that open in the same direction
	B. place a protruding architectural element, such as a chimney or pilaster, between the windows
	C. use double hung windows
	D. none of the above—window must be on different walls for natural ventilation to be effective

7. When the wind is blowing at 10 mph, the cross ventilation capacity of  a room with 32 sq ft apertures on opposite walls is 
	A. 8448 cfm
	B. 96 cfm
	C. 16,896 cfm
	D. 192 cfm

8. To double the capacity of a stack ventilation system you could 
	A. double the outlet aperture size
	B. double the stack height
	C. quadruple the stack height
	D. none of the above

9. Describe the interrelationship between thermal energy and mass
	A. mass stores thermal energy when it’s in abundance and releases it during times of need
	B. all material in nature, the mountains and the streams and the the air and we, are made of Light which has been spent, and this crumpled mass called material casts a shadow, and the shadow belongs to Light
	C. E = mc2
	D. all of the above 

10. The cooling load of a building can be reduced by shading
	A. windows
	B. walls
	C. the ground adjacent to the building
	D. all of the above

11. The rate of heat loss through the skin of a building is increased when
	A. the R-value of the wall is increased
	B. the exterior temperature is decreased
	C. shading devices are added to the exterior
	D. all of the above

12. Fifty cubic feet of water can store more energy per degree Fahrenheit than
	A. 100 cu ft of concrete
	B. 100 cu ft of wood
	C. 50 cu ft of steel
	D. all of the above

13. An effective thermal mass for a direct gain, passively heated building must have
	A. a high conductance
	B. a vast thickness
	C. low emissivity
	D. none of the above

14. A composite wall made of three materials that have U-values of 2, 0.2, and 0.02 respectively will have a total U-value (ignoring air films) of
	A. 0.018
	B. 0.2
	C. 0.55
	D. 2.22

15. On a cold winter day, the interior of an uninsulated wood frame wall will have a
	A. low surface temperature
	B. surface temperature near the room's air temperature
	C. higher surface temperature than a superinsulated wall
	D. none of the above

16. In a superinsulated wall, the vapor barrier should be placed 
	A. beneath the interior gypsum board 
	B. one-third of the way from inside to outside
	C. one-third of the way from outside to inside
	D. beneath the exterior sheathing

17. To be effective in heating, thermal mass should be
	A. about 90°F
	B. above your skin surface temperature
	C. above desired room temperature
	D. about 50°F

18. 	A building cooled by a desiccant cooling system is appropriate for
	A. a hot arid climate
	B. a hot humid climate
	C. a cold climate
	D. all of the above

19. Superinsulation in a wall can be achieved by
	A. Larsen trusses and batt insulation
	B. straw bales 
	C. stress-skin panels 
	D. all of the above

20. Superinsulation schemes eliminate thermal bridges at 
	A. the junction between wall and roof
	B. second floor to wall intersection
	C. middle of the wall
	D. all of the above

21. Blue-green glazing is most effective in reducing the transmission of 
	A. visible light
	B. near infrared radiation
	C. far infrared radiation
	D. all of the above

22. Glazing with an integral opaque shading device (mullions excluded) includes
	A. low-E glazing
	B. fritted glass
	C. Kalwall
	D. none of the above

23. Glazing that is effective in reducing solar gain/loss and providing daylighting is 
	A. thermopane blue 
	B. silica aero-gel 
	C. low-E 
	D. all of the above 

24. Promising research developments in high performance glazing include
	A. holographic diffractive structure glazing
	B. evacuated glazing
	C. electro-chromatic glazing
	D. all of the above

25. In a hot arid climate, the most cooling is delivered to the adjacent building by a courtyard that
	A. includes a fountain
	B. has a large tree
	C. is paved and barren
	D. has no arcades

26. Water and vegetation in a courtyard can provide
	A. daytime cooling
	B. psychological cooling
	C. both of the above
	D. none of the above

27. The value of a small window instead of a large window is
	A. decreased maintenance
	B. decreased effort to maintain thermal comfort
	C. decreased measures to maintain privacy
	D. all of the above

28. In an active solar heating/cooling system, overall efficiency is decreased when energy is moved from 
	A. sun to collector 
	B. collector to storage
	C. storage to space heating/cooling
	D. all of the above

29. An advantage of an active solar system is
	A. high efficiency
	B. control of time of use of the energy
	C. low cost of installation and maintenance
	D. all of the above

30. Seasonal storage of thermal energy in an active solar system can be attained by
	A. a rock bed
	B. a large water tank
	C. the earth beneath a building
	D. all of the above