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Presure and flow of Gases, Buoyancy and water Properties

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Quiz on Presure and flow of Gases, Buoyancy and water Properties, created by Aaron Szelecz on 13/04/2016.
Aaron Szelecz
Quiz by Aaron Szelecz, updated more than 1 year ago
Aaron Szelecz
Created by Aaron Szelecz over 8 years ago
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Resource summary

Question 1

Question
What two elements combine to form a water molecule
Answer
  • hydrogen and oxygen
  • carbon and oxygen
  • hydrogen and chlorine
  • sulphur and oxygen

Question 2

Question
What does the pH scale measure
Answer
  • number of oxygen ions
  • number of water ions
  • number of hydrogen ions
  • number of alkaline ions

Question 3

Question
What is the ph of neutral water
Answer
  • 6
  • 7
  • 8
  • 9

Question 4

Question
what is the difference in the hydrogen ion conventration from ph4 to ph5
Answer
  • 10 000 times as strong
  • 1000 times as strong
  • 100 times as strong
  • 10 times as strong

Question 5

Question
what effect does acidic water have on ferrous piping materials
Answer
  • corrosion
  • coating
  • carbonization
  • scaling

Question 6

Question
What causes temporary hardness
Answer
  • calcium carbonates
  • magnesium carbonates
  • acidity
  • calcium and/or magnesium bicarbonates

Question 7

Question
why should a hot water tank be set at a temperature below 50C
Answer
  • 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

Question 8

Question
what is the buoyant force available on a 5ft3 object if it is immersed in water
Answer
  • 49lb
  • 123.48lb
  • 312lb
  • 5000lb

Question 9

Question
what is the volume of an object that weighs 925 kg when weighed in air, but only 570 kg when weighed in water
Answer
  • 5.689m3
  • 0.925m3
  • 0.57m3
  • 0.355m3

Question 10

Question
what will an object with a volume of 0.658ft3 an a weight of 40lb o when placed in water
Answer
  • 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

Question 11

Question
How much extra weight would be required to sink a sealed drum with a volume of 2.725m3 and a mass of 22.7kg
Answer
  • 2 726kg
  • 19 976kg
  • 2 703.3kg
  • 22 701kg

Question 12

Question
what is the pressure exerted by 80' head of water
Answer
  • 8.15psi
  • 34.64 psi
  • 184.75psi
  • 784psi

Question 13

Question
Which of the following is a correct definition of flow rate
Answer
  • 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

Question 14

Question
what is one major contributor to turbulent flow
Answer
  • high velocity
  • long runs of straight piping
  • correct reaming of the pipe
  • large flow rates

Question 15

Question
which one of the following factors does not affect the pressure loss in the flow of fluids in a piping system
Answer
  • viscosity of the fluid
  • size of the piping
  • number of fittings and valves
  • static pressure in the piping system

Question 16

Question
what is one probable cause of water hammer
Answer
  • too many hangers supporting the piping
  • a quick closing valve
  • a sudden increase in pipe size
  • too many valves open at the same time

Question 17

Question
what is the relationship between pressure an velocity in the narrowest portion of a venturi
Answer
  • pressure increases, velocity decreases
  • pressure increases, velocity increases
  • pressure decreases, velocity decreases
  • pressure decreases, velocity increases

Question 18

Question
what causes cavitation
Answer
  • 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

Question 19

Question
how do you find the amount of expansion
Answer
  • lengthxtemp changex co effecient of expansion
  • heightxtemp change x coeffecient of expansion

Question 20

Question
The Term pH is used to indicate the level of [blank_start]acidity[blank_end] or [blank_start]alkalinity[blank_end] within a solution
Answer
  • acidity
  • fluidity
  • alkalinity
  • solubility

Question 21

Question
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-)
Answer
  • hydrogen ions
  • hydrogen atoms
  • hydroxyl ions
  • hydroxyl atoms

Question 22

Question
When an atom loses an electron it becomes a [blank_start]positive[blank_end] ion
Answer
  • positive
  • negative

Question 23

Question
When an atom picks up a free electron it becomes a [blank_start]negative[blank_end] ion
Answer
  • negative
  • positive

Question 24

Question
The pH scale mathematically relates the concentration of [blank_start]hydrogen[blank_end] ions
Answer
  • hydrogen
  • hydroxyle

Question 25

Question
0 on the pH scale is Highly [blank_start]Acidic[blank_end]
Answer
  • Acidic
  • Alkaline

Question 26

Question
A pH value of 14 is considered highly [blank_start]Alkaline[blank_end]
Answer
  • Alkaline
  • Acidic

Question 27

Question
[blank_start]Acidic[blank_end] water has a corrosive effect
Answer
  • Acidic
  • Alkaline

Question 28

Question
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]
Answer
  • increases
  • decreases
  • decreases
  • increases
  • decreases
  • increases
  • increases
  • decreases

Question 29

Question
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]
Answer
  • water hammer
  • hammer time

Question 30

Question
[blank_start]Cavitation[blank_end] is a very destructive process that occurs in a liquid flowing in a piping system.
Answer
  • Cavitation
  • water hammer

Question 31

Question
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
Answer
  • Height x Density of liquid
  • Width x Density of liquid

Question 32

Question
[blank_start]0.433[blank_end]lb/in2/ft [blank_start]9.81[blank_end]KPa/m
Answer
  • 9.81
  • 0.433
  • 0.433
  • 9.81

Question 33

Question
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]
Answer
  • 21.03 psig
  • 23 psig

Question 34

Question
[blank_start]Boyle's Law[blank_end] - Variables: pressure, volume and temperature
Answer
  • Boyle's Law
  • Charles Law

Question 35

Question
As the pressure from the mercury was [blank_start]increased[blank_end], the volume of the air [blank_start]decreased[blank_end]
Answer
  • increased
  • decreased
  • decreased
  • increased

Question 36

Question
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.
Answer
  • absolute pressures
  • pressures

Question 37

Question
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
Answer
  • boyles law
  • chucks law

Question 38

Question
Charles law is the law, [blank_start]temperature[blank_end] and [blank_start]volume[blank_end] are in a direct relationship
Answer
  • temperature
  • pressure
  • volume
  • pressure

Question 39

Question
Charles Law uses [blank_start]absolute temperatrues[blank_end]
Answer
  • absolute temperatrues
  • not absolute temperatues

Question 40

Question
(100F+[blank_start]460[blank_end])= 560R(Rankine)
Answer
  • 460
  • 100

Question 41

Question
100C+[blank_start]273[blank_end]=373K(Kelvin)
Answer
  • 273
  • 470

Question 42

Question
Similar to Charles Law, Guy-Lussac's Law examines the relationship between [blank_start]temperature[blank_end] and [blank_start]pressure[blank_end]
Answer
  • temperature
  • height
  • pressure
  • width

Question 43

Question
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
Answer
  • will
  • will not

Question 44

Question
65 x 1.414=91.91 50 x 1.414=70.7 162.61 650+650=1300-162.61 [blank_start]1137[blank_end]
Answer
  • 1137
  • 200

Question 45

Question
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
Answer
  • 0-50
  • 50-100
  • 50-100
  • 100-150
  • 100-150
  • 150-200
  • 150-200
  • 200
  • 200
  • 300

Question 46

Question
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]
Answer
  • 200 mg/L
  • 150 mg/L

Question 47

Question
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
Answer
  • minerals
  • rocks

Question 48

Question
[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)
Answer
  • Temporary hardness
  • Permanent hardness

Question 49

Question
[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)
Answer
  • Permanent hardness
  • Temporary harness

Question 50

Question
[blank_start]Oxidation[blank_end] is water containing dissolved air, which is composed of nitrogen and oxygen
Answer
  • Oxidation
  • jack ass

Question 51

Question
[blank_start]Solubility[blank_end] temperature affects the solubility of dissolved chemical in water. Temperatures above 60C result in temporary hardness.
Answer
  • Solubility
  • bounceility

Question 52

Question
[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.
Answer
  • Density and expansion
  • bobs mom

Question 53

Question
[blank_start]Archimedes Principle[blank_end] A body, immersed in a fluid, loses as much weight as the weight of the fluid it displaces
Answer
  • Archimedes Principle
  • Bobs principle

Question 54

Question
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
Answer
  • laws of buoyancy
  • laws of banking

Question 55

Question
[blank_start]Buoyant force[blank_end]=weight of the liquid displaced
Answer
  • Buoyant force
  • The force

Question 56

Question
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]
Answer
  • float
  • sink
  • sink
  • float

Question 57

Question
[blank_start]Mass[blank_end]=volume x density
Answer
  • Mass
  • your mom

Question 58

Question
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
Answer
  • buoyant force
  • bob

Question 59

Question
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'
Answer
  • or
  • and

Question 60

Question
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
Answer
  • laminar
  • turbulent

Question 61

Question
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
Answer
  • turbulent
  • laminar

Question 62

Question
[blank_start]Viscosity[blank_end] is the property of a liquid to resist flow
Answer
  • Viscosity
  • dancing

Question 63

Question
[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
Answer
  • Pressure loss
  • hey pauly

Question 64

Question
The [blank_start]eye[blank_end] of the impellar is a low pressure area, and the vapor bubbles implode at high pressure areas
Answer
  • eye
  • mouth
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