Aaron Szelecz
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Quiz on Presure and flow of Gases, Buoyancy and water Properties, created by Aaron Szelecz on 13/04/2016.

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Aaron Szelecz
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Presure and flow of Gases, Buoyancy and water Properties

Question 1 of 64

1

What two elements combine to form a water molecule

Select one of the following:

  • hydrogen and oxygen

  • carbon and oxygen

  • hydrogen and chlorine

  • sulphur and oxygen

Explanation

Question 2 of 64

1

What does the pH scale measure

Select one of the following:

  • number of oxygen ions

  • number of water ions

  • number of hydrogen ions

  • number of alkaline ions

Explanation

Question 3 of 64

1

What is the ph of neutral water

Select one of the following:

  • 6

  • 7

  • 8

  • 9

Explanation

Question 4 of 64

1

what is the difference in the hydrogen ion conventration from ph4 to ph5

Select one of the following:

  • 10 000 times as strong

  • 1000 times as strong

  • 100 times as strong

  • 10 times as strong

Explanation

Question 5 of 64

1

what effect does acidic water have on ferrous piping materials

Select one of the following:

  • corrosion

  • coating

  • carbonization

  • scaling

Explanation

Question 6 of 64

1

What causes temporary hardness

Select one of the following:

  • calcium carbonates

  • magnesium carbonates

  • acidity

  • calcium and/or magnesium bicarbonates

Explanation

Question 7 of 64

1

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

Select one of the following:

  • 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

Explanation

Question 8 of 64

1

what is the buoyant force available on a 5ft3 object if it is immersed in water

Select one of the following:

  • 49lb

  • 123.48lb

  • 312lb

  • 5000lb

Explanation

Question 9 of 64

1

what is the volume of an object that weighs 925 kg when weighed in air, but only 570 kg when weighed in water

Select one of the following:

  • 5.689m3

  • 0.925m3

  • 0.57m3

  • 0.355m3

Explanation

Question 10 of 64

1

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

Select one of the following:

  • 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

Explanation

Question 11 of 64

1

How much extra weight would be required to sink a sealed drum with a volume of 2.725m3 and a mass of 22.7kg

Select one of the following:

  • 2 726kg

  • 19 976kg

  • 2 703.3kg

  • 22 701kg

Explanation

Question 12 of 64

1

what is the pressure exerted by 80' head of water

Select one of the following:

  • 8.15psi

  • 34.64 psi

  • 184.75psi

  • 784psi

Explanation

Question 13 of 64

1

Which of the following is a correct definition of flow rate

Select one of the following:

  • 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

Explanation

Question 14 of 64

1

what is one major contributor to turbulent flow

Select one of the following:

  • high velocity

  • long runs of straight piping

  • correct reaming of the pipe

  • large flow rates

Explanation

Question 15 of 64

1

which one of the following factors does not affect the pressure loss in the flow of fluids in a piping system

Select one of the following:

  • viscosity of the fluid

  • size of the piping

  • number of fittings and valves

  • static pressure in the piping system

Explanation

Question 16 of 64

1

what is one probable cause of water hammer

Select one of the following:

  • too many hangers supporting the piping

  • a quick closing valve

  • a sudden increase in pipe size

  • too many valves open at the same time

Explanation

Question 17 of 64

1

what is the relationship between pressure an velocity in the narrowest portion of a venturi

Select one of the following:

  • pressure increases, velocity decreases

  • pressure increases, velocity increases

  • pressure decreases, velocity decreases

  • pressure decreases, velocity increases

Explanation

Question 18 of 64

1

what causes cavitation

Select one of the following:

  • 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

Explanation

Question 19 of 64

1

how do you find the amount of expansion

Select one of the following:

  • lengthxtemp changex co effecient of expansion

  • heightxtemp change x coeffecient of expansion

Explanation

Question 20 of 64

1

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The Term pH is used to indicate the level of ( acidity, fluidity ) or ( alkalinity, solubility ) within a solution

Explanation

Question 21 of 64

1

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The pH of water can be broken down into two parts ( hydrogen ions, hydrogen atoms )(H+) ( hydroxyl ions, hydroxyl atoms ) (OH-)

Explanation

Question 22 of 64

1

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When an atom loses an electron it becomes a ( positive, negative ) ion

Explanation

Question 23 of 64

1

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When an atom picks up a free electron it becomes a ( negative, positive ) ion

Explanation

Question 24 of 64

1

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The pH scale mathematically relates the concentration of ( hydrogen, hydroxyle ) ions

Explanation

Question 25 of 64

1

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0 on the pH scale is Highly ( Acidic, Alkaline )

Explanation

Question 26 of 64

1

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A pH value of 14 is considered highly ( Alkaline, Acidic )

Explanation

Question 27 of 64

1

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( Acidic, Alkaline ) water has a corrosive effect

Explanation

Question 28 of 64

1

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Velocity ( increases, decreases ), pressure ( decreases, increases ) and as velocity ( decreases, increases ) pressure ( increases, decreases )

Explanation

Question 29 of 64

1

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The trade off between velocity energy and head pressure energy can be seen characteristic of water flow, which is commonly known as ( water hammer, hammer time )

Explanation

Question 30 of 64

1

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( Cavitation, water hammer ) is a very destructive process that occurs in a liquid flowing in a piping system.

Explanation

Question 31 of 64

1

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Pressure = ( Height x Density of liquid, Width x Density of liquid )
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

Explanation

Question 32 of 64

1

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( 0.433, 9.81 )lb/in2/ft

( 9.81, 0.433 )KPa/m

Explanation

Question 33 of 64

1

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The height is 90' to gauge B
the first gauge reads 60psig

Pressure = 60psig-90'x0.433psi=21.03psig
Gauge B would read ( 21.03 psig, 23 psig )

Explanation

Question 34 of 64

1

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( Boyle's Law, Charles Law ) - Variables: pressure, volume and temperature

Explanation

Question 35 of 64

1

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As the pressure from the mercury was ( increased, decreased ), the volume of the air ( decreased, increased )

Explanation

Question 36 of 64

1

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It is important to note that boyle's Law is based upon ( absolute pressures, pressures ) and all gauge pressures must be converted to absolute before any calculations can be done.

Explanation

Question 37 of 64

1

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The formula for ( boyles law, chucks law ) is

v1/V2=P2/P1 or P1V1=P2V2

V1 =the original volume
V2=the new volume
P1=the original pressure
P2=the new pressure

Explanation

Question 38 of 64

1

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Charles law is the law, ( temperature, pressure ) and ( volume, pressure ) are in a direct relationship

Explanation

Question 39 of 64

1

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Charles Law uses ( absolute temperatrues, not absolute temperatues )

Explanation

Question 40 of 64

1

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(100F+( 460, 100 ))= 560R(Rankine)

Explanation

Question 41 of 64

1

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100C+( 273, 470 )=373K(Kelvin)

Explanation

Question 42 of 64

1

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Similar to Charles Law, Guy-Lussac's Law examines the relationship between ( temperature, height ) and ( pressure, width )

Explanation

Question 43 of 64

1

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All three variables(volume,pressure and temperature)are included in the combined Gas Law. In this law, a change in one variable ( will, will not ) affect the other two variables

Explanation

Question 44 of 64

1

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65 x 1.414=91.91
50 x 1.414=70.7
162.61
650+650=1300-162.61
( 1137, 200 )

Explanation

Question 45 of 64

1

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Total hardness

1mg/L=1ppm

soft - ( 0-50, 50-100 )mg/L
moderately soft- ( 50-100, 100-150 )mg/L
moderately hard- ( 100-150, 150-200 )mg/L
Hard- ( 150-200, 200 )mg/L
Very Hard- over ( 200, 300 )mg/L

Explanation

Question 46 of 64

1

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Very hard water is unfit for human consumption or potable water supplies unless softened by treating the water to less than ( 200 mg/L, 150 mg/L )

Explanation

Question 47 of 64

1

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We use the term hardness to designate the amount of these dissolved ( minerals, rocks ) contained in the water.

-Temporary harness
-permanent hardness and
-total hardness

Explanation

Question 48 of 64

1

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( Temporary hardness, Permanent hardness ) 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)

Explanation

Question 49 of 64

1

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( Permanent hardness, Temporary harness ) 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)

Explanation

Question 50 of 64

1

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( Oxidation, jack ass ) is water containing dissolved air, which is composed of nitrogen and oxygen

Explanation

Question 51 of 64

1

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( Solubility, bounceility ) temperature affects the solubility of dissolved chemical in water. Temperatures above 60C result in temporary hardness.

Explanation

Question 52 of 64

1

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( Density and expansion, bobs mom ) 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.

Explanation

Question 53 of 64

1

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( Archimedes Principle, Bobs principle ) A body, immersed in a fluid, loses as much weight as the weight of the fluid it displaces

Explanation

Question 54 of 64

1

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The three ( laws of buoyancy, laws of banking ) 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

Explanation

Question 55 of 64

1

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( Buoyant force, The force )=weight of the liquid displaced

Explanation

Question 56 of 64

1

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If the object weighs more than 156 lb, it will ( sink, float )

If the object weighs less than 156 lb it will ( float, sink )

Explanation

Question 57 of 64

1

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( Mass, your mom )=volume x density

Explanation

Question 58 of 64

1

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volume of the anchor = 100lb/480lb/ft cubic= 0.2083 ft3

( buoyant force, bob ) 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

Explanation

Question 59 of 64

1

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10' of head of water wold equal a pressure of 10'x0.433psi/ft=4.33 ( or, and ) conversely, a pressure of 50psi/0.433psi/ft= 115.473'

Explanation

Question 60 of 64

1

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In ( laminar, turbulent ) or streamline flow the water particles move in a straight line paths parallel to the walls of the pipe

Explanation

Question 61 of 64

1

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In ( turbulent, laminar ) flow the pattern is highly irregular, with a constant churning of water from side to side, top to bottom

Explanation

Question 62 of 64

1

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( Viscosity, dancing ) is the property of a liquid to resist flow

Explanation

Question 63 of 64

1

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( Pressure loss, hey pauly ) 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

Explanation

Question 64 of 64

1

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The ( eye, mouth ) of the impellar is a low pressure area, and the vapor bubbles implode at high pressure areas

Explanation

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