Quiz 2 Flashcards
A force moving an object
Work
The total pressure of a confined mixture of non-reacting (inert) gases is the sum of the pressures of each of the gases in the mixture. Is what law
Dalton’s law
Rate of doing work that includes a time element in addition to weight and distance
Horsepower
Its unit of measurement is cubic feet per pound (ft3/ lb)
Specific volume
At a constant pressure, the volume of a gas varies directly as to the absolute temperature, and at a constant volume, the pressure of a gas varies directly with the absolute temperature.
Charle’s law
Energy can be neither created or destroyed, but can be converted from one form to another.
Law of conservation of energy
The unit of measurement for specific gravity is
Unitless number
Boyle’s Law deals with pressure and temperature.
False
General Law of Perfect gas is a combination of Boyle’s and Charles’ laws.
True
Charles’ law deals with pressure and temperature.
True
Energy stored in fossil fuels is called chemical energy.
True
Specific volume and density are inverses of one another.
True
Specific Volume is measured in pounds per cubic foot (Ib/ft*).
False
One watt of electrical energy is equivalent to 3.413 Btus/h
True
Which object is warmer than the other -400°F or -200°C ?
Same temp
1600 ft of air is flowing across an evaporator coil and is cooled from 85°F to 65°F. What would be the volume of air exiting the evaporator coil?
Using V1/T1 = V2/T2 formula, add the absolute temps to the given temps 1600x525 then divide by 545. 1541.28ft3
Nitrogen has a specific volume of 13.8 ft/Ib. What is its density?
0.0725 (1/13.8)
A natural gas tank holding 100,000 ft of gas is stored at 75ºF in the spring. In the summer, the temperature rises to 100°F. What would the pressure be in the summer if the original pressure was 15 psig? Convert to absolute temp and psia before calculating Convert final answer back to psig
16.38psig
Density of wáter is 62.4 Ib/ft’. What is its specific volume?
0.016025641 (1/62.4)
Density of ordinary window glass is 157 lb/ft. What is its specific gravity?
157/62.4 =2.516
A 2,500 pound concrete block is moved 80 fi. How much work was performed?
2500x80 200,000
