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