Test
Presure and flow of Gases, Buoyancy and water Properties
Este test tiene tipos de pregunta que se abren en el reproductor de siempre.
Preguntas del test (64)
1What two elements combine to form a water molecule
- Ahydrogen and oxygen
- Bcarbon and oxygen
- Chydrogen and chlorine
- Dsulphur and oxygen
2What does the pH scale measure
- Anumber of oxygen ions
- Bnumber of water ions
- Cnumber of hydrogen ions
- Dnumber of alkaline ions
3What is the ph of neutral water
- A6
- B7
- C8
- D9
4what is the difference in the hydrogen ion conventration from ph4 to ph5
- A10 000 times as strong
- B1000 times as strong
- C100 times as strong
- D10 times as strong
5what effect does acidic water have on ferrous piping materials
- Acorrosion
- Bcoating
- Ccarbonization
- Dscaling
6What causes temporary hardness
- Acalcium carbonates
- Bmagnesium carbonates
- Cacidity
- Dcalcium and/or magnesium bicarbonates
7why should a hot water tank be set at a temperature below 50C
- Aa prevent permanent hardness from settling out
- Bto prevent total hardness from settling out
- Cto prevent carbonates of calcium and magnesium from settling out
- Dto prevent temporary hardness from settling out
8what is the buoyant force available on a 5ft3 object if it is immersed in water
- A49lb
- B123.48lb
- C312lb
- D5000lb
9what is the volume of an object that weighs 925 kg when weighed in air, but only 570 kg when weighed in water
- A5.689m3
- B0.925m3
- C0.57m3
- D0.355m3
10what will an object with a volume of 0.658ft3 an a weight of 40lb o when placed in water
- Asink
- Bremain in equilibrium, neither sinking nor rising
- Cbarely float with most of the object submerged
- Dfloat high on the water, with very little submerged
11How much extra weight would be required to sink a sealed drum with a volume of 2.725m3 and a mass of 22.7kg
- A2 726kg
- B19 976kg
- C2 703.3kg
- D22 701kg
12what is the pressure exerted by 80' head of water
- A8.15psi
- B34.64 psi
- C184.75psi
- D784psi
13Which of the following is a correct definition of flow rate
- Aspeed of the fluid in a pipe
- Bpressure of the fluid in a pipe
- Cvolume of the fluid in a pipe
- Dthe quantity moving in a pipe
14what is one major contributor to turbulent flow
- Ahigh velocity
- Blong runs of straight piping
- Ccorrect reaming of the pipe
- Dlarge flow rates
15which one of the following factors does not affect the pressure loss in the flow of fluids in a piping system
- Aviscosity of the fluid
- Bsize of the piping
- Cnumber of fittings and valves
- Dstatic pressure in the piping system
16what is one probable cause of water hammer
- Atoo many hangers supporting the piping
- Ba quick closing valve
- Ca sudden increase in pipe size
- Dtoo many valves open at the same time
17what is the relationship between pressure an velocity in the narrowest portion of a venturi
- Apressure increases, velocity decreases
- Bpressure increases, velocity increases
- Cpressure decreases, velocity decreases
- Dpressure decreases, velocity increases
18what causes cavitation
- Aexcessive pressure in the pump discharge
- Bvapour bubbling forming in a low pressure area
- Cvapour bubbles forming in a high pressure area
- Dcorroded pipe collapsing
19how do you find the amount of expansion
- Alengthxtemp changex co effecient of expansion
- Bheightxtemp change x coeffecient of expansion
20The Term pH is used to indicate the level of [blank_start]acidity[blank_end] or [blank_start]alkalinity[blank_end] within a solution
- Aacidity
- Bfluidity
- Calkalinity
- Dsolubility
21The pH of water can be broken down into two parts [blank_start]hydrogen ions[blank_end](H+) [blank_start]hydroxyl ions[blank_end] (OH-)
- Ahydrogen ions
- Bhydrogen atoms
- Chydroxyl ions
- Dhydroxyl atoms
22When an atom loses an electron it becomes a [blank_start]positive[blank_end] ion
- Apositive
- Bnegative
23When an atom picks up a free electron it becomes a [blank_start]negative[blank_end] ion
- Anegative
- Bpositive
24The pH scale mathematically relates the concentration of [blank_start]hydrogen[blank_end] ions
- Ahydrogen
- Bhydroxyle
250 on the pH scale is Highly [blank_start]Acidic[blank_end]
- AAcidic
- BAlkaline
26A pH value of 14 is considered highly [blank_start]Alkaline[blank_end]
- AAlkaline
- BAcidic
27[blank_start]Acidic[blank_end] water has a corrosive effect
- AAcidic
- BAlkaline
28Velocity [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]
- Aincreases
- Bdecreases
- Cdecreases
- Dincreases
- Edecreases
- Fincreases
- Gincreases
- Hdecreases
29The 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]
- Awater hammer
- Bhammer time
30[blank_start]Cavitation[blank_end] is a very destructive process that occurs in a liquid flowing in a piping system.
- ACavitation
- Bwater hammer
31Pressure = [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- AHeight x Density of liquid
- BWidth x Density of liquid
32[blank_start]0.433[blank_end]lb/in2/ft
[blank_start]9.81[blank_end]KPa/m- A9.81
- B0.433
- C0.433
- D9.81
33The 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]- A21.03 psig
- B23 psig
34[blank_start]Boyle's Law[blank_end] - Variables: pressure, volume and temperature
- ABoyle's Law
- BCharles Law
35As the pressure from the mercury was [blank_start]increased[blank_end], the volume of the air [blank_start]decreased[blank_end]
- Aincreased
- Bdecreased
- Cdecreased
- Dincreased
36It 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.
- Aabsolute pressures
- Bpressures
37The 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- Aboyles law
- Bchucks law
38Charles law is the law, [blank_start]temperature[blank_end] and [blank_start]volume[blank_end] are in a direct relationship
- Atemperature
- Bpressure
- Cvolume
- Dpressure
39Charles Law uses [blank_start]absolute temperatrues[blank_end]
- Aabsolute temperatrues
- Bnot absolute temperatues
40(100F+[blank_start]460[blank_end])= 560R(Rankine)
- A460
- B100
41100C+[blank_start]273[blank_end]=373K(Kelvin)
- A273
- B470
42Similar to Charles Law, Guy-Lussac's Law examines the relationship between [blank_start]temperature[blank_end] and [blank_start]pressure[blank_end]
- Atemperature
- Bheight
- Cpressure
- Dwidth
43All 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
- Awill
- Bwill not
4465 x 1.414=91.91
50 x 1.414=70.7
162.61
650+650=1300-162.61
[blank_start]1137[blank_end]- A1137
- B200
45Total 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- A0-50
- B50-100
- C50-100
- D100-150
- E100-150
- F150-200
- G150-200
- H200
- I200
- J300
46Very 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]
- A200 mg/L
- B150 mg/L
47We 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- Aminerals
- Brocks
48[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)
- ATemporary hardness
- BPermanent hardness
49[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)
- APermanent hardness
- BTemporary harness
50[blank_start]Oxidation[blank_end] is water containing dissolved air, which is composed of nitrogen and oxygen
- AOxidation
- Bjack ass
51[blank_start]Solubility[blank_end] temperature affects the solubility of dissolved chemical in water. Temperatures above 60C result in temporary hardness.
- ASolubility
- Bbounceility
52[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.
- ADensity and expansion
- Bbobs mom
53[blank_start]Archimedes Principle[blank_end] A body, immersed in a fluid, loses as much weight as the weight of the fluid it displaces
- AArchimedes Principle
- BBobs principle
54The 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- Alaws of buoyancy
- Blaws of banking
55[blank_start]Buoyant force[blank_end]=weight of the liquid displaced
- ABuoyant force
- BThe force
56If 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]- Afloat
- Bsink
- Csink
- Dfloat
57[blank_start]Mass[blank_end]=volume x density
- AMass
- Byour mom
58volume 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- Abuoyant force
- Bbob
5910' 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'
- Aor
- Band
60In [blank_start]laminar[blank_end] or streamline flow the water particles move in a straight line paths parallel to the walls of the pipe
- Alaminar
- Bturbulent
61In [blank_start]turbulent[blank_end] flow the pattern is highly irregular, with a constant churning of water from side to side, top to bottom
- Aturbulent
- Blaminar
62[blank_start]Viscosity[blank_end] is the property of a liquid to resist flow
- AViscosity
- Bdancing
63[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- APressure loss
- Bhey pauly
64The [blank_start]eye[blank_end] of the impellar is a low pressure area, and the vapor bubbles implode at high pressure areas
- Aeye
- Bmouth
Información
- Descripción
- Test sobre Presure and flow of Gases, Buoyancy and water Properties, creado por Aaron Szelecz el 13/04/2016.
- Autor
- Aaron Szelecz
- Idioma
- English
- Visitas
- 39
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