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1 cubic foot of water = 6.22 Imp Gal
1 cubic foot of water = 7.48 US Gal
relative denity of Hg = 13.6

The weight of 1 Imp. gal of water.
10 lbs

Weight of 1 US gal of water
8.33 lbs

1 cubic foot of water weighs
62.4 lbs


1 cubic meter of water weighs
1000 kgs

Define saturated steam.
steam at the same temp. as the water from which the steam was produced

What is the most steam produced by one lb of water?
dry saturated steam
.98lb of steam.

How do you convert guage pressure to absolute pressure?
add 14.7

How do you convert Inches of Vaccuum to psia?
subtract the reading from 29.92" to acheive positive pressure and then multiply the answer by .491 psi/inch of mercury

A pressure goes up
Boiling Temp goes.....
Volume goes....
boiling temp increases  direct correlation
Volume of steam becomes less  indirect correlation

What is the 45' ratio for offsets?
run/offset times 1.414 gets hypoteneuse

What does pH stand for?
What is neutral?
What is acidic?
What is alkaline?
the level of acidity the # of H ions present
 Neutral = 7
 Acidic = 06.9
 Alkaline = 7.1  14

What is total hardness in water?
how much mineral deposit dissolved in water.
measured in 1mg/l = 1ppm

What is temporary hardness in water?
Bicarbonates of calcium and magnesium dissolved in the water. When heated, causes scaly deposits from 120'F to 140'F.

What is permanent hardness in water?
carbonates of calcium and magnesium, sulphates, nitrates and chlorides.
Do not create scale unless water is heated above 350'F. When in steam, does not evaporate so stays in boiler. This causes the sludge in boilers hence blowoff valves.

What is Archimedes' Principle?
buoyant forces acting on a body reduced the weight of the body equal to the weight of the liquid the body displaced.

The three laws of Buoyancy?
 1. a body sinks if the mass of the fluid displaced is less than the mass of the body
 2. if a body displaces a mass of fluid greater than its own mass, it will float
 3. a body remains in equlibrium neither rising nor sining if the mass of the fluid it displaces equals its own mass

Buoyant Force= weight of liquid displaced
Weight of liquid displaced = volume x density of liquid

What does the pH scale measure?
hydrogen ion concentration

What causes water to be acidic?
large H ion concentration

What is considered neutral?
7
 below 7 = acidic
 above 7 = basic (alkaline)

An object that floats has a relative density of?
less than one

An object that floats will displace a volume of fluid...
less than the object volume

In alternating current, how often (frequency) do the electrons alternate direction?
60 times/second

When electricty is related to water:
Voltage =
Amperage =
Resistance =
 Voltage = pressure
 Amperage = flow rate
 Resistance = friction

An electricity generator has two important parts:
stator and rotor

the Electromitiv force in an electrical circuit is measured in?
volts

Electrical current producted by most large power generating plants is usaully....
AC

Define Ohm's Law.
  1 volt will push 1 amp through 1 ohm
  increase of voltage increases current flow if resistance stays same
  increase in resistance decreases current flow if voltage stays same

Ohm's Law
E
I R
E= voltage
I= current
R = resistance
In series circuit all resistances (loads) are additive
 In parrallel circuit, total resistance is:
 1/R_{t}=1/R_{1 }+ 1/R_{2 }+ 1/R_{3}

Which class of lever always has a mechanical advantage greater than 1?
class 2

Which class of lever can have a mechanical advantage greater or less than 1?
class 1

Which class of lever always has a mechanical advantage less than 1?
class 3

A pair of pliers is considered a class ____ lever.
1

A pipe wrench is considered a class ___ lever.
2

What is Boyle's Law?
the inverse relationship between pressure and volume of gases
 P_{1}V_{1}=P_{2}V_{2}
 NOTE: based on psia

What is Charle's Law?
the direct relationship between temperature and volume of gas.
 Note: based on absolute temps.
 Rankin(imp) = +460
 Kelvin (met) = +273

What is the Combined Gas Law?
relationship between temperature and pressure.
P_{1}V_{1}T_{2} = P_{2}V_{2}T_{1}

Electrons orbit the nucleus of the atom in pathways called:
shells

Electromagnetism can be produced by:
electrical current flow creating a magnetic field around a conductor

Electrolysis is:
producing electricity by chemical reaction

In a series circuit, total resistance is:
the sum of all resistances in the circuit

In a parallel circuit, total resistance is:
less than the smallest resistance in the circuit

What is the definition of flow rate?
the quantity moving in a pipe

Charle's Law states that an increase in temp will result in:
an increase of volume

What does the monoflow tee rely on?
venturi princple

Lever that always has mechanical advantage greater than 1?
class 2

Lever that always has mechanical advantage less than 1?
class 3

