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57
Science
Graduate
07/24/2009

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Term
The Three phsical states of matter are
Definition
1. Solid
2. Liquid
3. Gaseous
Term
What is an element?
Definition
Any more than 100 fundamental subsatnces that consist of atoms of only one kind or combination all matter which can not be reduced by ordinary chemical means
Term
What is a compound?
Definition
substance composed by uniting two or more substance or similar elements by chemical action in porportions contains elements
Term
_____ have both a definite volume and a definite shape
Definition
Solids
Term
_____ have a definite volume, but conform to the shape of the container into which they are placed
Definition
Liquid
Term
________have neither a definite volume or shape, but have the ability to diffuse or or expand indefinitely.
Definition
gaseous
Term
______ may be defined as anything that has weight and occupies space or has a measurable volume.
Definition
Matter
Term
What is an atom?
Definition
an tom is a small partical of an element which can exist alone or in combination with other elements. Consists of two parts positive charged cetral and the nucleus.
Term
The two main parts of an atom are the ___ and the ____.
Definition
Nucleous
Electrons
Term
List five elements commonly used in the piping industry, and give their chemical symbol
Definition
1. Copper (Cu)
2. Lead (Ph)
3. Oxygen (O)
4. Tin (Sh)
5. Iron (Fe)
Term
_______(H) is the lightest element known, with an atomic weight of 1.0080
Definition
Hydrogen
Term
The melting point of copper(Cu) is 1,083
Definition
True
Term
The difference between the states of matter that water may assume is directly related to __________.
Definition
Temperature
Term
Water is most dense at _______
Definition
39 degree F
Term
The electric resistance pyrometer operates under the principle that an increase in temperature will cause an increase in the resistance to flow of an electric current
Definition
True
Term
The term ____ is the measure of heat required to raise the temperature of one Lb of water to degree F
Definition
BTU
Term
List three terms that directly relate to a temperature change in a known substance
Definition
1. Specific heat
2. Sensible heat
3. Latent heat
Term
The amount of heat in Btu required to change the temperature of lb of a substance of one degree F is defined as the _______ of that substance.
Definition
Specific heat
Term
The quanity of heat involved when any substance undergoes a change in temperature that can be measured with a thermometer is referred to as __________.
Definition
sensible heat
Term
What is a calorie?
Definition
the amount of heat required to raise the temperature of 1 gram
Term
Define the term Latent heat ?
Definition
Amount of heat required to be added to or subtracted from a substance to produce a change of state.
Term
The specific heat of ice is 1.5
Definition
False
Term
Two terms closely related to liquids are _____ and _______.
Definition
Solution
suspension
Term
A Scale for measuring the acidity or alkalinity of water is know as the ____ and refers to the active hydrogen atoms of water.
Definition
off scale
Term
What is an Ion?
Definition
Center of an atom
Term
What are the physical properties of pure water ?
Definition
odorless, colorless and tasteless
Term
How many Btuare required to change 20 gal of water at 212 degree F to steam at 212 degree.
Definition
multiply by 970
Term
The process of converting a liquid into a vapor is called condensation
Definition
False
Term
With an increase in pressure, the latent heat content of one ob of saturated steam will __________
Definition
decrease
Term
For a given pressure, the temperature and volume of saturated steam are fixed
Definition
False
Term
The pressure at the bottom of a one ft cube of water is ______ psig.
Definition
.433
Term
Water pressure is usually measured by means of a _________gage.
Definition
Bourdon Tube
Term
What is Boyle's Law?
Definition
Volume of a confined gas is inversely proportional to the absolute pressure exserted on it provided the temperature remains constant Intial pressure
Term
State Boyle's Law Mathematically
Definition
Final volume (V2)=
______________
Initial Volume (V1)
Term
A partial ___________ is any pressure less than atmospheric
Definition
Vaccum
Term
How does siphonic action empty the (WC) of its contents ?
Definition
1. Water enters bowl at rim
2. more water flows over the dam, creating a curtain of water through the passageway
3. creating a partial vacuum
4.passage way is displaced
5. When the passageway is filled, siphonic action is created
Term
How are inches of Hg converted to lb/sq in?
Definition
Inch of Hg may be converted to psi, by multiplying by .491 or dividing by 2.03 the density of Hg in.lb/cu. in
Term
STP is abbreviation for ?
Definition
Standard Temperature and pressure
Term
One in. of Hg column is equal to approximately ____ in of water column.
Definition
12
Term
The term feet per second (fps) is an expression used when measuring _______
Definition
Velocity
Term
As a fluid flows through a piping system there is a loss of pressure due to friction .List four factors whcih will affect this pressure loss.
Definition
1. Viscosity of fluid
2. Length of pipe
3. Size and type of pipe
4. Number and type of fittings
Term
A quantity of water which flows at a rate of 7.48 gpm equals a quantity of water that flows at a rate of ____ cu.ft/min and _____lb.min
Definition
1. 1 cu.ft/min
2. 62.4 lb.min
Term
A venturi operates on the same general principle as an
Definition
orifice
Term
Turbulence caused when a fluid flows through a converter or heat exchanger will increase the efficiency of heat transfer.
Definition
True
Term
The deman at a laundry tray is 5gpm, whcih is supplied by a 1/2 in. Type L copper tube . What is the velocity of water in the tube in fpm & fps
The velocity is ____fpm or _____fps
Definition
1. 417fpm
2. 6.95fps
Term
In a steady flow situation pressure increases as the velocity increases
Definition
False
Term
water hammer is less likely to occur with lower velocities
Definition
True
Term
High velocities are desirable in a water supply system because they keep the inside of the supply lines scrubbed clean
Definition
false
Term
A venturi may be used to create a negative pressure at a desired location
Definition
True
Term
List the six simple machine
Definition
1. Lever
2. Pulley
3. Wheel and axle
4. inclined plane
5. wedge
6. screw
Term
A ______ lever has the effort applied between the fulcrum and resistance
Definition
Third class lever
Term
A _______ class lever has the fulcrum between the effort and the resistance
Definition
first class
Term
What is mechanical advantage?
Definition
Force that performs work to the force which is applied to a machine, disregarding friction
Term
The two most common used of a machine are to change force and speed
Definition
True
Term
The work output of a machine is greater than the work input.
Definition
False
Term
The work is equal to force x distance and the unit of measurement is ft/lbs.
Definition
True
Term
List four examples of 3rd class levers.
Definition
1. Broom
2. Tweezers
3. Ice cube tongs
4. Human forarm
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