5121340
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Quiz von Aaron Szelecz, aktualisiert more than 1 year ago
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Erstellt von Aaron Szelecz
vor mehr als 8 Jahre
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Frage 1
Frage
What two elements combine to form a water molecule
Antworten
-
hydrogen and oxygen
-
carbon and oxygen
-
hydrogen and chlorine
-
sulphur and oxygen
Frage 2
Frage
What does the pH scale measure
Antworten
-
number of oxygen ions
-
number of water ions
-
number of hydrogen ions
-
number of alkaline ions
Frage 3
Frage
What is the ph of neutral water
Antworten
-
6
-
7
-
8
-
9
Frage 4
Frage
what is the difference in the hydrogen ion conventration from ph4 to ph5
Antworten
-
10 000 times as strong
-
1000 times as strong
-
100 times as strong
-
10 times as strong
Frage 5
Frage
what effect does acidic water have on ferrous piping materials
Antworten
-
corrosion
-
coating
-
carbonization
-
scaling
Frage 6
Frage
What causes temporary hardness
Antworten
-
calcium carbonates
-
magnesium carbonates
-
acidity
-
calcium and/or magnesium bicarbonates
Frage 7
Frage
why should a hot water tank be set at a temperature below 50C
Antworten
-
a prevent permanent hardness from settling out
-
to prevent total hardness from settling out
-
to prevent carbonates of calcium and magnesium from settling out
-
to prevent temporary hardness from settling out
Frage 8
Frage
what is the buoyant force available on a 5ft3 object if it is immersed in water
Antworten
-
49lb
-
123.48lb
-
312lb
-
5000lb
Frage 9
Frage
what is the volume of an object that weighs 925 kg when weighed in air, but only 570 kg when weighed in water
Antworten
-
5.689m3
-
0.925m3
-
0.57m3
-
0.355m3
Frage 10
Frage
what will an object with a volume of 0.658ft3 an a weight of 40lb o when placed in water
Antworten
-
sink
-
remain in equilibrium, neither sinking nor rising
-
barely float with most of the object submerged
-
float high on the water, with very little submerged
Frage 11
Frage
How much extra weight would be required to sink a sealed drum with a volume of 2.725m3 and a mass of 22.7kg
Antworten
-
2 726kg
-
19 976kg
-
2 703.3kg
-
22 701kg
Frage 12
Frage
what is the pressure exerted by 80' head of water
Antworten
-
8.15psi
-
34.64 psi
-
184.75psi
-
784psi
Frage 13
Frage
Which of the following is a correct definition of flow rate
Antworten
-
speed of the fluid in a pipe
-
pressure of the fluid in a pipe
-
volume of the fluid in a pipe
-
the quantity moving in a pipe
Frage 14
Frage
what is one major contributor to turbulent flow
Antworten
-
high velocity
-
long runs of straight piping
-
correct reaming of the pipe
-
large flow rates
Frage 15
Frage
which one of the following factors does not affect the pressure loss in the flow of fluids in a piping system
Antworten
-
viscosity of the fluid
-
size of the piping
-
number of fittings and valves
-
static pressure in the piping system
Frage 16
Frage
what is one probable cause of water hammer
Antworten
-
too many hangers supporting the piping
-
a quick closing valve
-
a sudden increase in pipe size
-
too many valves open at the same time
Frage 17
Frage
what is the relationship between pressure an velocity in the narrowest portion of a venturi
Antworten
-
pressure increases, velocity decreases
-
pressure increases, velocity increases
-
pressure decreases, velocity decreases
-
pressure decreases, velocity increases
Frage 18
Frage
what causes cavitation
Antworten
-
excessive pressure in the pump discharge
-
vapour bubbling forming in a low pressure area
-
vapour bubbles forming in a high pressure area
-
corroded pipe collapsing
Frage 19
Frage
how do you find the amount of expansion
Antworten
-
lengthxtemp changex co effecient of expansion
-
heightxtemp change x coeffecient of expansion
Frage 20
Frage
The Term pH is used to indicate the level of [blank_start]acidity[blank_end] or [blank_start]alkalinity[blank_end] within a solution
Antworten
-
acidity
-
fluidity
-
alkalinity
-
solubility
Frage 21
Frage
The pH of water can be broken down into two parts [blank_start]hydrogen ions[blank_end](H+) [blank_start]hydroxyl ions[blank_end] (OH-)
Antworten
-
hydrogen ions
-
hydrogen atoms
-
hydroxyl ions
-
hydroxyl atoms
Frage 22
Frage
When an atom loses an electron it becomes a [blank_start]positive[blank_end] ion
Antworten
-
positive
-
negative
Frage 23
Frage
When an atom picks up a free electron it becomes a [blank_start]negative[blank_end] ion
Antworten
-
negative
-
positive
Frage 24
Frage
The pH scale mathematically relates the concentration of [blank_start]hydrogen[blank_end] ions
Antworten
-
hydrogen
-
hydroxyle
Frage 25
Frage
0 on the pH scale is Highly [blank_start]Acidic[blank_end]
Antworten
-
Acidic
-
Alkaline
Frage 26
Frage
A pH value of 14 is considered highly [blank_start]Alkaline[blank_end]
Antworten
-
Alkaline
-
Acidic
Frage 27
Frage
[blank_start]Acidic[blank_end] water has a corrosive effect
Antworten
-
Acidic
-
Alkaline
Frage 28
Frage
Velocity [blank_start]increases[blank_end], pressure [blank_start]decreases[blank_end] and as velocity [blank_start]decreases[blank_end] pressure [blank_start]increases[blank_end]
Antworten
-
increases
-
decreases
-
decreases
-
increases
-
decreases
-
increases
-
increases
-
decreases
Frage 29
Frage
The trade off between velocity energy and head pressure energy can be seen characteristic of water flow, which is commonly known as [blank_start]water hammer[blank_end]
Antworten
-
water hammer
-
hammer time
Frage 30
Frage
[blank_start]Cavitation[blank_end] is a very destructive process that occurs in a liquid flowing in a piping system.
Antworten
-
Cavitation
-
water hammer
Frage 31
Frage
Pressure = [blank_start]Height x Density of liquid[blank_end]
Pressure= 35' x 0.433 lb/in2/ft
Pressure=15.115 psi
15.115psi is equal to the pressure exerted by a column of water 35' high
but we want an additional 4 psi at the highest point of the system
Therefore, add 15.115psi=4psi =19.155
Antworten
-
Height x Density of liquid
-
Width x Density of liquid
Frage 32
Frage
[blank_start]0.433[blank_end]lb/in2/ft
[blank_start]9.81[blank_end]KPa/m
Antworten
-
9.81
-
0.433
-
0.433
-
9.81
Frage 33
Frage
The height is 90' to gauge B
the first gauge reads 60psig
Pressure = 60psig-90'x0.433psi=21.03psig
Gauge B would read [blank_start]21.03 psig[blank_end]
Antworten
-
21.03 psig
-
23 psig
Frage 34
Frage
[blank_start]Boyle's Law[blank_end] - Variables: pressure, volume and temperature
Antworten
-
Boyle's Law
-
Charles Law
Frage 35
Frage
As the pressure from the mercury was [blank_start]increased[blank_end], the volume of the air [blank_start]decreased[blank_end]
Antworten
-
increased
-
decreased
-
decreased
-
increased
Frage 36
Frage
It is important to note that boyle's Law is based upon [blank_start]absolute pressures[blank_end] and all gauge pressures must be converted to absolute before any calculations can be done.
Antworten
-
absolute pressures
-
pressures
Frage 37
Frage
The formula for [blank_start]boyles law[blank_end] is
v1/V2=P2/P1 or P1V1=P2V2
V1 =the original volume
V2=the new volume
P1=the original pressure
P2=the new pressure
Antworten
-
boyles law
-
chucks law
Frage 38
Frage
Charles law is the law, [blank_start]temperature[blank_end] and [blank_start]volume[blank_end] are in a direct relationship
Antworten
-
temperature
-
pressure
-
volume
-
pressure
Frage 39
Frage
Charles Law uses [blank_start]absolute temperatrues[blank_end]
Antworten
-
absolute temperatrues
-
not absolute temperatues
Frage 40
Frage
(100F+[blank_start]460[blank_end])= 560R(Rankine)
Antworten
-
460
-
100
Frage 41
Frage
100C+[blank_start]273[blank_end]=373K(Kelvin)
Antworten
-
273
-
470
Frage 42
Frage
Similar to Charles Law, Guy-Lussac's Law examines the relationship between [blank_start]temperature[blank_end] and [blank_start]pressure[blank_end]
Antworten
-
temperature
-
height
-
pressure
-
width
Frage 43
Frage
All three variables(volume,pressure and temperature)are included in the combined Gas Law. In this law, a change in one variable [blank_start]will[blank_end] affect the other two variables
Antworten
-
will
-
will not
Frage 44
Frage
65 x 1.414=91.91
50 x 1.414=70.7
162.61
650+650=1300-162.61
[blank_start]1137[blank_end]
Antworten
-
1137
-
200
Frage 45
Frage
Total hardness
1mg/L=1ppm
soft - [blank_start]0-50[blank_end]mg/L
moderately soft- [blank_start]50-100[blank_end]mg/L
moderately hard- [blank_start]100-150[blank_end]mg/L
Hard- [blank_start]150-200[blank_end]mg/L
Very Hard- over [blank_start]200[blank_end]mg/L
Antworten
-
0-50
-
50-100
-
50-100
-
100-150
-
100-150
-
150-200
-
150-200
-
200
-
200
-
300
Frage 46
Frage
Very hard water is unfit for human consumption or potable water supplies unless softened by treating the water to less than [blank_start]200 mg/L[blank_end]
Antworten
-
200 mg/L
-
150 mg/L
Frage 47
Frage
We use the term hardness to designate the amount of these dissolved [blank_start]minerals[blank_end] contained in the water.
-Temporary harness
-permanent hardness and
-total hardness
Antworten
-
minerals
-
rocks
Frage 48
Frage
[blank_start]Temporary hardness[blank_end] is Bicarbonates of calcium and magnesium dissolved in the water cause temporary hardness. This occurs at approximately 60C(140F). For this reason the thermostats must not be set at temperatures greater than 60C(140F)
Antworten
-
Temporary hardness
-
Permanent hardness
Frage 49
Frage
[blank_start]Permanent hardness[blank_end] is carbonates of calcium and magnesium in addition sulfates,nitrates and chlorides of other elements. This does not occur unless the water is heated above 148C(299F)
Antworten
-
Permanent hardness
-
Temporary harness
Frage 50
Frage
[blank_start]Oxidation[blank_end] is water containing dissolved air, which is composed of nitrogen and oxygen
Antworten
-
Oxidation
-
jack ass
Frage 51
Frage
[blank_start]Solubility[blank_end] temperature affects the solubility of dissolved chemical in water. Temperatures above 60C result in temporary hardness.
Antworten
-
Solubility
-
bounceility
Frage 52
Frage
[blank_start]Density and expansion[blank_end] is an increase in temperature produces a change in the density of water for example a cubic meter of water at 4C has a mass of 1000kg, but at 100C the mas becomes 958.05kg. As temperature increased, molecular motion also increased and the molecules occupied a larger space.
Antworten
-
Density and expansion
-
bobs mom
Frage 53
Frage
[blank_start]Archimedes Principle[blank_end] A body, immersed in a fluid, loses as much weight as the weight of the fluid it displaces
Antworten
-
Archimedes Principle
-
Bobs principle
Frage 54
Frage
The three [blank_start]laws of buoyancy[blank_end] are
1. A body sinks in a fluid 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. body remains in equilibrium neither rising nor sinking if the mass of the fluid it displaces equals its own mass
Antworten
-
laws of buoyancy
-
laws of banking
Frage 55
Frage
[blank_start]Buoyant force[blank_end]=weight of the liquid displaced
Antworten
-
Buoyant force
-
The force
Frage 56
Frage
If the object weighs more than 156 lb, it will [blank_start]sink[blank_end]
If the object weighs less than 156 lb it will [blank_start]float[blank_end]
Antworten
-
float
-
sink
-
sink
-
float
Frage 57
Frage
[blank_start]Mass[blank_end]=volume x density
Antworten
-
Mass
-
your mom
Frage 58
Frage
volume of the anchor = 100lb/480lb/ft cubic= 0.2083 ft3
[blank_start]buoyant force[blank_end] availabe= 0.2083ft cubic x 62.4 lb/ft cubic= 12.99 lb
when we lift the anchor in the water it will require 100lb-12.99lb= 87.01 lb of force to lift the anchor
Antworten
-
buoyant force
-
bob
Frage 59
Frage
10' of head of water wold equal a pressure of 10'x0.433psi/ft=4.33 [blank_start]or[blank_end] conversely, a pressure of 50psi/0.433psi/ft= 115.473'
Antworten
-
or
-
and
Frage 60
Frage
In [blank_start]laminar[blank_end] or streamline flow the water particles move in a straight line paths parallel to the walls of the pipe
Antworten
-
laminar
-
turbulent
Frage 61
Frage
In [blank_start]turbulent[blank_end] flow the pattern is highly irregular, with a constant churning of water from side to side, top to bottom
Antworten
-
turbulent
-
laminar
Frage 62
Frage
[blank_start]Viscosity[blank_end] is the property of a liquid to resist flow
Antworten
-
Viscosity
-
dancing
Frage 63
Frage
[blank_start]Pressure loss[blank_end] the amount of energy spent to over come the resistance of flow(friction is called pressure loss or pressure drop
For example , a !" pipe with a flow rate of 8 US gallons/minute has a pressure loss of 7.8'(3.4psi) of head per one hundred feet of length
Antworten
-
Pressure loss
-
hey pauly
Frage 64
Frage
The [blank_start]eye[blank_end] of the impellar is a low pressure area, and the vapor bubbles implode at high pressure areas
Antworten
-
eye
-
mouth
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