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.
