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BS Flashcards

(68 cards)

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1
Q

Hypothalamus

A

Acts as a thermostat within the human body

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2
Q

U-value

A

Thermal transmittance

U=1/R

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3
Q

Cooling capacity guidelines

A

Older home - 1 ton / 500 sf

New home - 1 ton / 1000 sf

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4
Q

Zeolite process

A

Used to soften water that has a high mineral content

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5
Q

Chlorination

A

Most common process used to disinfect drinking water

Chlorine kills bacteria and viruses

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6
Q

Ozonation and ultraviolet light

A

Two methods of removing harmful organisms from drinking water

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7
Q

Preaction sprinkler

A

Admit water into pipes after the system detects a fire
Water enters pipes as an alarm is sounded. Slight delay
Good application - where there would be a lot of water damage

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8
Q

Deluge system

A

All sprinkler heads open at the same time

Good application - where flammable materials are stored or where fire can spread very quickly

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9
Q

Photoelectric smoke detector

A

Pass a beam of light onto a sensor. Alarm sounds when beam is obscured by smoke

Smoke forms when fire reaches smoldering stage

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10
Q

Spot heat detectors

A

Of all types would detect a fire last

Detect changes in temperature of the space - after most deadly smoke stage

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11
Q

Declination angle

A

The angle of the earth’s axis relative to the position of the sun

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12
Q

Profile angle

A

The angle of the shadow that is cast by an overhang

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13
Q

Energy policy act of 1992 maximum dispensing rates

A

Shower heads - 2.5 gal per min
Toilets - 1.6 gal per flush
Faucets - 2.5 gal per min

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14
Q

Metal halide lamps

A

Sensitive to orientation
Designated with a proper burning position: base up, base down, horizontal, universal
Lose efficiency and lumen power if not installed correctly

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15
Q

Lamp with the highest and lowest life span

A

Highest (24,000 hours) high pressure sodium and mercury vapor

Lowest (2,000 hours) incandescent

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16
Q

Static head

A

The amount of pressure required to lift water through a piping system in a building

.433 can life water 1 foot

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17
Q

Degree day

A

Calculated by comparing the base temperature to the average temperature on a specific date in a specific location

Days average temperatures less than the base temperature you subtract to determine the number of heating degree days

Temperatures above base temp is recorded as cooling degree day

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18
Q

Dual duct system

A

Hot and cool air are both constantly available
Can provide heating and cooling simultaneously
Drawbacks: expensive, a lot of duct work, not very energy efficient

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19
Q

Building energy cost method

A

ASHREA 90.1 - energy cost budget
Allows the designer to compare the annual energy costs of the design building to a baseline building.
Design energy costs are less in the design building the building complies with the standard

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20
Q

System performance method

A

ASHREA 90.1 - energy cost budget
Complex calculations based upon a sites climate
Computer model often necessary

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21
Q

Prescriptive criteria method

A

ASHREA 90.1 - energy cost budget

Calculations to be completed relatively quickly but tends to be more restrictive than other methods

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22
Q

Blower door

A

A fan that can be mounted in a door frame. It is used to pressurize or depressurize a building to measure air infiltration or leakage

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23
Q

Nanometer

A

Measures differences in pressure between two spaces

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24
Q

Flow hood

A

Placed over a register or diffuser to measure output

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25
Duct blower
Similar to blower hood but is attached directly to the ductwork to check for leaks
26
Creep
The reflection of sound along a curved surface (dome) | Sound can be heard along the way but not across the room
27
Diffusion
Sound is scattered all around a room as it is reflected from convex surfaces
28
Specular reflection
The reflection of sound off hard polished surfaces
29
Dead space
Spaces that have short reverberation times | Highlight spoken-word presentations
30
Live space
Spaces with long reverberations times | Musical presentations
31
Vacuum breaker
A flap that opens to admit air if there is suction in a water pipe, which prevents siphoning of wastewater back into the clean water supply system
32
Tone
A sound composed of a single frequency
33
Note
Represents a specific frequency of wavelength
34
Pitch
The number of complete wave forms per second
35
Incandescent lamp shapes | A, PS, P, S, G, T, PAR, R, ER, MR
``` A- arbitrary standard shape PS- pear shape, straight neck P- pear shape S- straight G- globe T- tubular PAR- parabolic aluminized reflector R- reflector ER - elliptical reflector MR- miniature reflector ```
36
Specific heat
The amount of heat in btu required to raise the temperature of one unit of mass one degree of temperature Directly related to thermal storage capacity
37
Centrifugal governor
Sets the brake and shuts off the power to an elevator
38
Safety rail clamps
On an elevator | Wedge against the guide rail and stop the car smoothly
39
Final-limit switches
Activated if the elevator overruns the safe limits of travel either up or down
40
Buffers
Installed in the elevator put to cushion the elevator as it stops Not capable of stopping a falling car
41
Escalator travel speed and angle
Average 100 ft/min | Always installed at an angle of 30 degrees
42
Brightness ratio
The relationship between the illumination levels of the surfaces within a persons field of vision Max. Ideal brightness level ration between a task and the adjacent surroundings should be under 1:1/3
43
Zonal cavity method
Allows a designer to calculate the number of fixtures required to producers specified number of footcandles
44
Photoelectric cells
A type of perimeter security system | Pass a beam from one point to another. An alarm sounds when the beam is broken
45
Pressure sensor
Detect changes in pressure on the floor cause by a person walking
46
Ultrasonic detectors
Use a high frequency sound wave to sense intruders
47
Photoelectric beans
Use infrared technology to protect space | Beam is broken by an intruders movements an alarm sounds
48
SEER
Seasonal energy efficiency ratio | Residential air conditioning rating =13
49
% added to total construction cost for a sprinkler system
New building adds 1%-1.5% to total construction cost | Retrofit - adds considerably more
50
Curtain board
Draft curtain Assembly suspended from the ceiling to prohibit movement of smoke and flame Often used to protect openings in the floor such as escalators and mezzanines
51
Fixture units
A measurement of the amount of water required to operate a plumbing fixture Each fixture in a building can be added together to determine the buildings total demand and size plumbing pipes Flush valve water closet - requires 10 Flush-tank toilet - 5 Washing machine - 1.4-3 Lavatories - 2
52
Substation transformer
Tend to be very large | Always mounted on a concrete pad
53
Distribution transformer
Smaller in size | Can be mounted either on a pole or a pad
54
Sound intensity levels decrease
6 dB for every doubling of distance
55
Centrifugal fan
Used for moving large amounts of air Also called a squirrel cage
56
Air sealing
The process of dealing ducts, openings and cracks to prevent air leakage
57
Ohm's law
If voltage goes up, current goes up. If voltage goes down, current will go down
58
DC current
Current that flows only in one direction with constant voltage. Typically used for low voltage applications
59
AC current
Direction of the flow can be reversed rapidly by reversing the voltage. Standard form of electrical current supplied by the utility grid
60
Branch circuit
Insulated wires that run between the outlet and the panel box
61
Fuse
A thin strip of metal that melts and breaks an electrical circuit if a current exceeds a safe level
62
Interlocked armored cable (BX)
Pre wrapped set of wires encase I spiral armor made in the shop
63
baffles
a shield of metal, wood or plastic used to screen a light source from normal angles of viewing used to conceal the lamp and provide light cutoff
64
ballast
supply controlled voltage to start the lamp supply sufficient voltage to start the lamp by striking an arc limit the current once the lamp is started cold weather ballast, dimming ballast also available
65
sound intensity level
the decible, how intense a sound is
66
sound power level (PWL)
watts/cm^2, the power at the source
67
sound pressure level (SPL)
the pressure exerted by the sound wave on a surface at a given location, varies with barromic pressure
68
tapping machine
used to measure the degree of isolation of impact noises in a structure

ARE exam (5 decks)

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