S&T Numbers Flashcards
(46 cards)
The quantity of heat required to change the temperature of 1 g of water by 1°C is ____Joules.
4.2 joules
Page 14
A single BTU is the amount of heat required to raise the temperature of ____pound of water by ____°F
1 pound
1 degree
Page 14
When comparing Joules and BTUs:
1 Btu = 1055 joules
Page 14
CEO combines with hemoglobin about ______times more effectively than oxygen.
200x
Pace 20
HCN is_____ times more toxic than CO.
35x
Page 21
More than ______ irritants and smoke have been identified including hydrogen chloride, formldehyde, and acrolein.
20 irritants
Page 21
At ambient temperatures (____°), copper will conduct heat more than _____times faster than steel likewise, steel is nearly ____ times as thermally conductive as concrete.
68°
7x
40x
Pace 27
One watt is ____ joule per second (j/s).
1 watt= 1 joules per second
Page 32
The prefix kilo indicates a multiple of ____ and mega indicates a multiple of____.
1000 - kilowatt=1000 watts
1 million - megawatt= 1 million watts
Page 32
Liquid fuels that vaporize sufficiently to burn at temperatures under______° present a significant flammability hazard.
100°
Pace 34
Pyrolysis of wood begins at temperatures below _____°, which is lower than the temperature required for ignition of the released vapors.
400°
Pace 35
At normal ambient temperatures, materials can ignite and burn at oxygen concentrations as low as____%.
15%
Pace 38
Oxygen concentrations:
Deficient %___
Enriched %___
Normal air %___
materials can ignite as low as %___
Nomex can burn%____
Deficient 19.5%
Enriched 23.5%
Normal air 21%
materials can ignite as low as 15%
Nomex can burn 31%
Page 38
A visual indicator that a fire is leaving the incipient stage is flame height. When flames reach ____ high, radiant heat begins to transfer more heat than convection
2.5 ft
Page 43
As flashover occurs, the gas temperatures in the room reach____ or higher.
1100°
Page 51
The auto ignition temperature of CO, the most abundant fuel gas created in most fires, is approximately____ °.
1100°
Pace 52
SCBA face piece begin to fail after 5 minutes of exposure to a heat flux of___.
15 kW/m squared
Pace 52
Over the past 50 years, building construction in North America has changed drastically. In single-family residential structures, the square footage of houses has increased over____% between ____and ____.
150%
1973 and 2008
Page 70
Unprotected engineered steel and wood trust can fail after ____minutes of exposure to fire. These trusses can fail from exposure to heat alone without flame contact. For steel trusses,____° is the
CRITICAL TEMPERATURE OF STEEL- the temperature at which steel begins the weaken.
5-10 min
1000°
Page 73
Before____, the bowstring truss roof design was one of the most common design types for large commercial and industrial structures.
yr 1960
Page 74
_____ with solid walls should have at least 2 opposite sides hinged at the bottom and held closed at the top with a fusible link that allows gravity to open them in case of a fire.
Monitors
Page 94
Type lV construction is often referred to as heavy timber construction. This construction type uses large dimensional lumber( greater than ___”) for all structural elements.
4 in
Page 106
Wood I-joist web was originally___-___inch plywood; in recent years OSB or a similar thickness has become more common.
3/8- 7/16 in
Page 108
____ inch gypsum board or equivalent protection is to be provided on the underside of floor framing members that are less than_____ nominal or large framing members.
1/2 in gypsum
2x10 nominal framing
Page 108
