Fundamentals of Hydraulics Flashcards
Water expands _____ of itself for each degree change of temperature above or below 39 deg. F
.0001 (one ten-thousandth)
The weight of a cubic foot of water at its maximum density (39.2 deg. F) is ___.
62.425 pounds or 62.5 pounds
A cubic foot is ___ wide, ___ long, and ____ high. When multiplied together = _____ cubic inches
12 / 12 / 12 / 1728 cubic inches
There is ____ cubic inches in One US standard gallon.
231 cubic inches
Dividing the 1728 by 231, we find that there are ___ gallons of fresh water.
8.35 pounds
Atmospheric pressure decreases as the elevation above sea level increases at a rate of approximately _____ for every thousand feet of elevation.
1/2 pound
___ is the maximum theoretical height to which it would be possible to lift water by suction at sea level.
33.9 feet
____ at sea level for the practical limit for draft.
22 2/3rd feet
At 2000 feet above sea level the maximum theoretical distance of draft would _____ and the practical limit is ____.
32 feet / 21 1/3 feet
1” of mercury (Hg) equals ___ of pressure
1/2 psi
A good stream will pass ____ of its whole volume of water inside a 15” circle.
9/10th
A good stream will pass ____ of its whole volume of water inside a 10” circle.
3/4th
A fire stream has its greatest horizontal range when the angle it makes with the earth is approx _____.
30 degrees
The vertical angle of a stream, as commonly used, is approx ____.
75 degrees
If the nozzle tip is ___ or larger, the reaction is greater than the nozzle pressure.
7/8”
The momentary nozzle reaction when the nozzle is first opened is ___ greater than the reaction after the water is flowing.
20%
Nozzle reaction from a spray nozzle is ____ than from a solid stream nozzle tinder the same nozzle pressure and rate of discharge.
considerably less
The horizontal movement of the ladder pipe should not exceed _____from the center as the ladders have little resistance to torsional effects.
15 degrees each way
Water weights approx ____ per cubic foot.
62.5 pounds per cubic foot
One cubic foot of water contains ___ cubic inches.
1728 cubic inches
One gallon of water contains ____ cubic inches.
231 cubic inches
There are ____ gallons in one cubic foot.
7.481 gallons
One gallon of water weights ____ pounds.
8.35 pounds
If mercury stands at a height of ___ inches (sea level), it indicates that a pressure of 14.7 pounds is present on the surface of mercury in a vessel.
30 inches
h = 1.13 Hg
With the compound gage indicating 15 inches of vacuum, to what height will water rise in suction?
1.13 x 15 = 16.95 feet
A stream nearly horizontal will penetrate ___ than one nearly vertical.
farther
___ is considered to be the height of a story
12 feet
___ feet the height of a window sill above the floor level.
3 feet
Nozzle Reaction :
NR = 1.5(D squared) NP
Air Leaks : Stop the priming pump and attempt to hold the vacuum in the pump. If the vacuum drops from maximum to about ____ in less than ___, there is a leak in the pump assembly. This leak may be in the valve, draincock, piping, casing or pump packing.
12 inches in less than 10.
