5121340
Descripción
Test por Aaron Szelecz, actualizado hace más de 1 año
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Creado por Aaron Szelecz
hace más de 8 años
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Pregunta 1
Pregunta
What two elements combine to form a water molecule
Respuesta
-
hydrogen and oxygen
-
carbon and oxygen
-
hydrogen and chlorine
-
sulphur and oxygen
Pregunta 2
Pregunta
What does the pH scale measure
Respuesta
-
number of oxygen ions
-
number of water ions
-
number of hydrogen ions
-
number of alkaline ions
Pregunta 3
Pregunta
What is the ph of neutral water
Respuesta
-
6
-
7
-
8
-
9
Pregunta 4
Pregunta
what is the difference in the hydrogen ion conventration from ph4 to ph5
Respuesta
-
10 000 times as strong
-
1000 times as strong
-
100 times as strong
-
10 times as strong
Pregunta 5
Pregunta
what effect does acidic water have on ferrous piping materials
Respuesta
-
corrosion
-
coating
-
carbonization
-
scaling
Pregunta 6
Pregunta
What causes temporary hardness
Respuesta
-
calcium carbonates
-
magnesium carbonates
-
acidity
-
calcium and/or magnesium bicarbonates
Pregunta 7
Pregunta
why should a hot water tank be set at a temperature below 50C
Respuesta
-
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
Pregunta 8
Pregunta
what is the buoyant force available on a 5ft3 object if it is immersed in water
Respuesta
-
49lb
-
123.48lb
-
312lb
-
5000lb
Pregunta 9
Pregunta
what is the volume of an object that weighs 925 kg when weighed in air, but only 570 kg when weighed in water
Respuesta
-
5.689m3
-
0.925m3
-
0.57m3
-
0.355m3
Pregunta 10
Pregunta
what will an object with a volume of 0.658ft3 an a weight of 40lb o when placed in water
Respuesta
-
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
Pregunta 11
Pregunta
How much extra weight would be required to sink a sealed drum with a volume of 2.725m3 and a mass of 22.7kg
Respuesta
-
2 726kg
-
19 976kg
-
2 703.3kg
-
22 701kg
Pregunta 12
Pregunta
what is the pressure exerted by 80' head of water
Respuesta
-
8.15psi
-
34.64 psi
-
184.75psi
-
784psi
Pregunta 13
Pregunta
Which of the following is a correct definition of flow rate
Respuesta
-
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
Pregunta 14
Pregunta
what is one major contributor to turbulent flow
Respuesta
-
high velocity
-
long runs of straight piping
-
correct reaming of the pipe
-
large flow rates
Pregunta 15
Pregunta
which one of the following factors does not affect the pressure loss in the flow of fluids in a piping system
Respuesta
-
viscosity of the fluid
-
size of the piping
-
number of fittings and valves
-
static pressure in the piping system
Pregunta 16
Pregunta
what is one probable cause of water hammer
Respuesta
-
too many hangers supporting the piping
-
a quick closing valve
-
a sudden increase in pipe size
-
too many valves open at the same time
Pregunta 17
Pregunta
what is the relationship between pressure an velocity in the narrowest portion of a venturi
Respuesta
-
pressure increases, velocity decreases
-
pressure increases, velocity increases
-
pressure decreases, velocity decreases
-
pressure decreases, velocity increases
Pregunta 18
Pregunta
what causes cavitation
Respuesta
-
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
Pregunta 19
Pregunta
how do you find the amount of expansion
Respuesta
-
lengthxtemp changex co effecient of expansion
-
heightxtemp change x coeffecient of expansion
Pregunta 20
Pregunta
The Term pH is used to indicate the level of [blank_start]acidity[blank_end] or [blank_start]alkalinity[blank_end] within a solution
Respuesta
-
acidity
-
fluidity
-
alkalinity
-
solubility
Pregunta 21
Pregunta
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-)
Respuesta
-
hydrogen ions
-
hydrogen atoms
-
hydroxyl ions
-
hydroxyl atoms
Pregunta 22
Pregunta
When an atom loses an electron it becomes a [blank_start]positive[blank_end] ion
Respuesta
-
positive
-
negative
Pregunta 23
Pregunta
When an atom picks up a free electron it becomes a [blank_start]negative[blank_end] ion
Respuesta
-
negative
-
positive
Pregunta 24
Pregunta
The pH scale mathematically relates the concentration of [blank_start]hydrogen[blank_end] ions
Respuesta
-
hydrogen
-
hydroxyle
Pregunta 25
Pregunta
0 on the pH scale is Highly [blank_start]Acidic[blank_end]
Respuesta
-
Acidic
-
Alkaline
Pregunta 26
Pregunta
A pH value of 14 is considered highly [blank_start]Alkaline[blank_end]
Respuesta
-
Alkaline
-
Acidic
Pregunta 27
Pregunta
[blank_start]Acidic[blank_end] water has a corrosive effect
Respuesta
-
Acidic
-
Alkaline
Pregunta 28
Pregunta
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]
Respuesta
-
increases
-
decreases
-
decreases
-
increases
-
decreases
-
increases
-
increases
-
decreases
Pregunta 29
Pregunta
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]
Respuesta
-
water hammer
-
hammer time
Pregunta 30
Pregunta
[blank_start]Cavitation[blank_end] is a very destructive process that occurs in a liquid flowing in a piping system.
Respuesta
-
Cavitation
-
water hammer
Pregunta 31
Pregunta
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
Respuesta
-
Height x Density of liquid
-
Width x Density of liquid
Pregunta 32
Pregunta
[blank_start]0.433[blank_end]lb/in2/ft
[blank_start]9.81[blank_end]KPa/m
Respuesta
-
9.81
-
0.433
-
0.433
-
9.81
Pregunta 33
Pregunta
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]
Respuesta
-
21.03 psig
-
23 psig
Pregunta 34
Pregunta
[blank_start]Boyle's Law[blank_end] - Variables: pressure, volume and temperature
Respuesta
-
Boyle's Law
-
Charles Law
Pregunta 35
Pregunta
As the pressure from the mercury was [blank_start]increased[blank_end], the volume of the air [blank_start]decreased[blank_end]
Respuesta
-
increased
-
decreased
-
decreased
-
increased
Pregunta 36
Pregunta
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.
Respuesta
-
absolute pressures
-
pressures
Pregunta 37
Pregunta
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
Respuesta
-
boyles law
-
chucks law
Pregunta 38
Pregunta
Charles law is the law, [blank_start]temperature[blank_end] and [blank_start]volume[blank_end] are in a direct relationship
Respuesta
-
temperature
-
pressure
-
volume
-
pressure
Pregunta 39
Pregunta
Charles Law uses [blank_start]absolute temperatrues[blank_end]
Respuesta
-
absolute temperatrues
-
not absolute temperatues
Pregunta 40
Pregunta
(100F+[blank_start]460[blank_end])= 560R(Rankine)
Respuesta
-
460
-
100
Pregunta 41
Pregunta
100C+[blank_start]273[blank_end]=373K(Kelvin)
Respuesta
-
273
-
470
Pregunta 42
Pregunta
Similar to Charles Law, Guy-Lussac's Law examines the relationship between [blank_start]temperature[blank_end] and [blank_start]pressure[blank_end]
Respuesta
-
temperature
-
height
-
pressure
-
width
Pregunta 43
Pregunta
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
Respuesta
-
will
-
will not
Pregunta 44
Pregunta
65 x 1.414=91.91
50 x 1.414=70.7
162.61
650+650=1300-162.61
[blank_start]1137[blank_end]
Respuesta
-
1137
-
200
Pregunta 45
Pregunta
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
Respuesta
-
0-50
-
50-100
-
50-100
-
100-150
-
100-150
-
150-200
-
150-200
-
200
-
200
-
300
Pregunta 46
Pregunta
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]
Respuesta
-
200 mg/L
-
150 mg/L
Pregunta 47
Pregunta
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
Respuesta
-
minerals
-
rocks
Pregunta 48
Pregunta
[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)
Respuesta
-
Temporary hardness
-
Permanent hardness
Pregunta 49
Pregunta
[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)
Respuesta
-
Permanent hardness
-
Temporary harness
Pregunta 50
Pregunta
[blank_start]Oxidation[blank_end] is water containing dissolved air, which is composed of nitrogen and oxygen
Respuesta
-
Oxidation
-
jack ass
Pregunta 51
Pregunta
[blank_start]Solubility[blank_end] temperature affects the solubility of dissolved chemical in water. Temperatures above 60C result in temporary hardness.
Respuesta
-
Solubility
-
bounceility
Pregunta 52
Pregunta
[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.
Respuesta
-
Density and expansion
-
bobs mom
Pregunta 53
Pregunta
[blank_start]Archimedes Principle[blank_end] A body, immersed in a fluid, loses as much weight as the weight of the fluid it displaces
Respuesta
-
Archimedes Principle
-
Bobs principle
Pregunta 54
Pregunta
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
Respuesta
-
laws of buoyancy
-
laws of banking
Pregunta 55
Pregunta
[blank_start]Buoyant force[blank_end]=weight of the liquid displaced
Respuesta
-
Buoyant force
-
The force
Pregunta 56
Pregunta
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]
Respuesta
-
float
-
sink
-
sink
-
float
Pregunta 57
Pregunta
[blank_start]Mass[blank_end]=volume x density
Respuesta
-
Mass
-
your mom
Pregunta 58
Pregunta
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
Respuesta
-
buoyant force
-
bob
Pregunta 59
Pregunta
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'
Respuesta
-
or
-
and
Pregunta 60
Pregunta
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
Respuesta
-
laminar
-
turbulent
Pregunta 61
Pregunta
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
Respuesta
-
turbulent
-
laminar
Pregunta 62
Pregunta
[blank_start]Viscosity[blank_end] is the property of a liquid to resist flow
Respuesta
-
Viscosity
-
dancing
Pregunta 63
Pregunta
[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
Respuesta
-
Pressure loss
-
hey pauly
Pregunta 64
Pregunta
The [blank_start]eye[blank_end] of the impellar is a low pressure area, and the vapor bubbles implode at high pressure areas
Respuesta
-
eye
-
mouth
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