Ballast Flashcards
What is the practical height limit of an upfeed system?
40’ to 60’
How is the max height of a downfeed system calculated?
The max pressure of a fixture / .434
Max pressure of a fixture is normally between 45 & 60 psi.
.434 psi required to lift up 1 ft. of water
What grade of copper is most commonly used for the majority of a plumbing system in a building?
What are the other grades?
Type L
Type K and Type M
Valve type used where water flow is variably and frequently controlled, such as with faucets or hose bibs. Friction loss is high.
Globe Valve
Valve type that is used where control is completely on or off. Low friction loss.
Gate Valve
Valve type that works automatically and allows water flow in only one direction. For example, where backflow might contaminate a potable water supply.
Check Valve
Emergency lighting in means-of-egress areas must have an intensity of no less than ___ fc.
1 fc
Information regarding the minimum number of plumbing fixtures required for various occupancies may be found in which of the following sources?
A. building codes
B. plumbing codes
C. both building and plumbing codes
D. the local authority having jurisdiction
C. both building and plumbing codes
The minimum fresh air ventilation rate recommended by ASHRAE Standard 62 is
A. 5 cfm/person
B. 10 cfm/person
C. 15 cfm/person
D. 20 cfm/person
C. 15 cfm/person
ln areas unobstructed forward reach, light switches and thermostats may be located a maximum of
A 42 in (106’1) above the finished floor
B. 44 in (1118) above the finished floor
C. 48 in (1220) above the finished floor
D. 54 in (1372) above the finished floor
C. 48 in (1220) above the finished floor
The fraction of the radiant energy received on the surface that is reflected.
The Albedo
Surfaces with ______ albedo absorb radiant energy.
Low
Which of the following is NOT a type of shading device?
A. Loggia
B. brise-soleil
C. Engawa
D. Belvedere
D. Belvedere
What is the required psi to lift 1’ of water?
.433 psi
Energy transfer wheels
A. Temper incoming air with exhaust
B. use ground temperature for heating and cooling
C. Capture the heat of flue gases to warm cold water.
D. Exchange heat from solar panels to an airstream.
A. Temper incoming air with exhaust
For a window with no light shelf, daylighting is effective for a distance of about ____ times the head height of the window.
1.5
For a window with a light shelf daylighting is effective to about ____ to ____ times the head height.
2.0 to 2.5
In calculating solar heal gain, what value must be known in addition to the area of the glass?
A. mean radiant temperature
B. design cooling factor
C, equivalent temperature difference
D. coefficient of heat transfer
B. design cooling factor
A building in a temperate climate will have some areas that require cooling and others that require heating at the same time. To minimize energy use, the best devices to
employ are
A. energy recovery ventilators
B. heat pipes
C. recuperative fuel econon1izers
D. water-loop heat pumps
D. water-loop heat pumps
Guideline for selecting a cooling system for an older home is 1 ton of cooling for approximately ____sq ft
500 sq ft
Guideline for selecting a cooling system for a newer home is 1 ton of cooling for approximately ____sq ft
1000 sq ft
The energy policy act of 1992 requires a maximum of ____ gallons of water for
Shower heads-
Toilets-
Urinals-
Shower heads- 2.5 gallons per minute
Toilets- 1.6 gallon per flush
Urinals- 1 gallon per flush
Formula for illuminance
E = I / D^2
