# Ballast Flashcards

1
Q

What is the practical height limit of an upfeed system?

A

40’ to 60’

2
Q

How is the max height of a downfeed system calculated?

A

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

3
Q

What grade of copper is most commonly used for the majority of a plumbing system in a building?

A

Type L

Type K and Type M

4
Q

Valve type used where water flow is variably and frequently controlled, such as with faucets or hose bibs. Friction loss is high.

A

Globe Valve

5
Q

Valve type that is used where control is completely on or off. Low friction loss.

A

Gate Valve

6
Q

Valve type that works automatically and allows water flow in only one direction. For example, where backflow might contaminate a potable water supply.

A

Check Valve

7
Q

Emergency lighting in means-of-egress areas must have an intensity of no less than ___ fc.

A

1 fc

8
Q

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

A

C. both building and plumbing codes

9
Q

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

A

C. 15 cfm/person

10
Q

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

A

C. 48 in (1220) above the finished floor

11
Q

The fraction of the radiant energy received on the surface that is reflected.

A

The Albedo

12
Q

Surfaces with ______ albedo absorb radiant energy.

A

Low

13
Q

Which of the following is NOT a type of shading device?

A. Loggia
B. brise-soleil
C. Engawa
D. Belvedere

A

D. Belvedere

14
Q

What is the required psi to lift 1’ of water?

A

.433 psi

15
Q

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

A. Temper incoming air with exhaust

16
Q

For a window with no light shelf, daylighting is effective for a distance of about ____ times the head height of the window.

A

1.5

17
Q

For a window with a light shelf daylighting is effective to about ____ to ____ times the head height.

A

2.0 to 2.5

18
Q

In calculating solar heal gain, what value must be known in addition to the area of the glass?

B. design cooling factor
C, equivalent temperature difference
D. coefficient of heat transfer

A

B. design cooling factor

19
Q

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

A

D. water-loop heat pumps

20
Q

Guideline for selecting a cooling system for an older home is 1 ton of cooling for approximately ____sq ft

A

500 sq ft

21
Q

Guideline for selecting a cooling system for a newer home is 1 ton of cooling for approximately ____sq ft

A

1000 sq ft

22
Q

The energy policy act of 1992 requires a maximum of ____ gallons of water for

Toilets-
Urinals-

A

Shower heads- 2.5 gallons per minute
Toilets- 1.6 gallon per flush
Urinals- 1 gallon per flush

23
Q

Formula for illuminance

A

E = I / D^2