Sicence Flashcards
T or F
The specific heat of all substances is represented as a percentage of the specific heat of water?
T
T or F
The human body loses heat in three ways? Radiation, Convection and Evaporation
T
T or F
Pressure equals height times density?
T
T or F
The boiling point of water is not affected by either an increase or decrease in pressure?
F
T or F
physical change does not affect the chemical composition of a substance?
T
T or F
All gasses have the same values for coefficients of expansion?
T
T or F
Liquids and gases make poor conductors of heat?
T
42 degrees celsisus is equal to how many degrees farenheit?
107.6
42°C x 9/5 + 32
- all values entered in these note cards will denote fractions as nine over 5 being 9/5.
As a fluid flows through a piping system there is a loss of pressure due to friction. Circle the factors that apply to this pressure loss?
A: viscosity of fluid
B: length of pipe
C: velocity of flow
D: size and type of pipe
E: all of the above
E. All of the above
The amount of heat in BTU required to change the temperature of one pound of a substance one degree F may be defined as the _____________ of that substance?
Specific heat
If the pressure on water which is being warmed is increased, the rate of evaporation of the water is _____________?
Decreased
Water pressure is usually measured by means of a _______________ type gauge?
Bourdon tube
Standard atmospheric pressure equals _______ psi or __________ in. Of Hg.
14.7 psi or 29.921 hg
The pressure at a certain depth below the surface of a liquid is _______ ?
Static head pressure
With a few exceptions, solids expand when ________ and __________ when cooled.
Heated and Contract
The thermo-couple operates under the principle that two _________ metals will produce a flow of electric current without am external source of electricity.
Dissimilar
As pressure decreases, volume _________.
Increases
As the pressure on a gas increases ( temperature remaining constant) the volume of the gas will __________?
Decrease
Boyles law
A substance that has a definite volume but no definite shape is called a ________?
Liquid
With the quantity of flow gpm constant, the velocity of flow will _________ with a decrease in pipe size.
Increase
Absolute zero is calculated to be ________ degrees fahrenheit.
-460
How many btu are required to change 20 gallons of water at 212° F to steam at 212°F?
20 gallons × 8.33lbs per 1 gallon of water.
= 166.60lbs x 970.4 Latent heat of Vaporization
= 161,668.64 BTU
What is the definition of work?
Is the product of force x distance.
What is the total weight of a tank filled with a liquid having a specific weight of .79? The tank is 52” in diameter by 8 ft in length and the tank weighs 300lbs empty.
A boiler is located in the penthouse of a building 300 ft above the basement. If the city water supply has a water pressure of 45 psi in the basement, how much additional pressure must be furnished by the pump used to fill the boiler?
What is one ft of water column expressed in psig?
.433 psig.
If the density D and the weight W of an object is known, write the formula that may be used to determine the volume of an object.
V = W/D
Or V = W÷D
What are the three states of matter?
Solids, Liquids, Gas or Vapor.
