Briefly discuss if it would be better to operate with pumps in parallel or series and how your answer would change as the steepness of the system curve changes?
Answers
Answer:
1) In series, the combined head will move from point 1 to point 2 in theory. However, practically speaking, the combined head and flow rate will move along the system curve to point 3.
2) In parallel, the combined head and volume flow will move along the system curve from point 1 to point 3.
Explanation:
1) Pump in series:
When two or more pumps are connected in series, their resulting pump performance curve will be obtained by adding their respective heads at the same flow rate as shown in the first diagram attached.
In the first diagram, we have 3 curves namely:
- system curve
- single pump curve
- 2 pump in series curve
Also, we have points labeled 1, 2 and 3.
- Point 1 represents the point that the system operates with one pump running.
- Point 2 represents the point where the head of two identical pumps connected in series is twice the head of a single pump flowing at the same rate.
- Point 3 is the point where the system is operating when both pumps are running.
Now, since the flowrate is constant, the combined head will move from point 1 to point 2 in theory. However, practically speaking, the combined head and flow rate will move along the system curve to point 3.
2) Pump in parallel:
When two or more pumps are connected in parallel, their resulting pump performance curve will be obtained by adding their respective flow rates at same head as shown in the second diagram attached.
In the second diagram, we have 3 curves namely:
- system curve
- single pump curve
- 2 pump in series curve
Also, we have points labeled 1, 2 and 3
- Point 1 represents the point that the system operates with one pump running.
- Point 2 represents the point where the flow rate of two identical pumps connected in series is twice the flow rate of a single pump.
- Point 3 is the point where the system is operating when both pumps are running.
In this case, the combined head and volume flow will move along the system curve from point 1 to point 3.
Related Questions
Two grenades, A and B, are thrown horizontally with different speeds from the top of a cliff 70 m high. The speed of A is 2.50 m/s and the speed of B is 3.40 m/s. Both grenades remain in air for 3.77 s. Assume that the acceleration due to gravity is 9.86 m/s2. What is the distance between A and B if they are thrown along the same straight line?
Answers
Explanation:
uuui ielts k oshru with the best of my life u
Calculate the torque developed by a motor that delivers 200 hp rotation at 3600 rpm. Use the Torque value to determine the diameter of a solid steel shaft with an allowable shear stress of 20,520 psi.
Answers
Solution :
Given:
Power, P = 200 hp
= 110000 lbf ft/s
Speed, N = 3600 rpm
Power , [tex]$P=\frac{2 \pi NT}{60}$[/tex]
∴ Torque, [tex]$T = \frac{60 P}{2 \pi N}$[/tex]
[tex]$T = \frac{60 \times 110000}{2 \pi \times 3600}$[/tex]
T = 291.93 lb -ft
[tex]$T_{allow} = 20,250 \ psi$[/tex] ---- allowable shear stress
Therefore, torque , T = 391.93 lb-ft
T = 291.93 x 12 lb-in
∴ T 3503.16 lb-in
Now from the Torsion formula,
[tex]$\frac{T}{J}=\frac{T_{allow}}{ r}$[/tex]
Here, [tex]$r=\frac{d}{2} ; \ \ \ J=\frac{\pi d^4}{32}$[/tex] ---- polar moment of inertia.
∴ [tex]$\frac{T}{\frac{\pi d^4}{32}}=\frac{T_{allow}}{ d/2}$[/tex]
[tex]$T_{allow}=\frac{16 T}{\pi d^3}$[/tex]
[tex]$\pi d^3=\frac{16 \times 3503.16}{20520}$[/tex]
[tex]$\pi d^3 = 2.7315$[/tex]
[tex]$d^3 = 0.8699$[/tex]
or [tex]$d= (0.8699)^{1/3}$[/tex]
d = 0.9546 in
Therefore the diameter of the shaft is 0.9546 in.
An ideal vapor-compression refrigeration cycle using refrigerant-134a as the working fluid is used to cool a brine solution to −5°C. This solution is pumped to various buildings for the purpose of air-conditioning. The refrigerant evaporates at −10°C with a total mass flow rate of 7 kg/s, and condenses at 600 kPa. Determine the COP of the cycle and the total cooling lo
Answers
Answer:
1141
7.2
Explanation:
The evaporator Temperature T1 = -10°C
h1 = 244.55kj/kg
S1 = 0.93782kj/kg
The enthalpy at second state from given condenser pressure from super heated refrigerant table
P2 = 600
S2 = S1
h2 = 267.19kj/kg
Enthalpy at 3 and 4 from condenser pressure
h3 = h4 = 81.5kj/kg
To get cooling load
QL = m(h1-h4)
M= 7
= 7(244.55-81.5)
= 7(163.05)
= 1141.35kw = 1141KW
COP
= h1-h4/h2 -h1
= 244.55-81.5/267.19-244.55
= 163.05/22.64
= 7.2
A soil with a cohesion of 25 kPa has a normal stress of 39 kPa and a shear stress of 56 kPa at the point of failure. The angle of internal friction for the soil is most nearly:__________.
Answers
Answer:
39⁰
Explanation:
We have cohesion c = 25kpa
Then the normal stress = 39kpa
Shear stress = 56kpa
This question is asking us to find the angle of internal friction
Shear stress at the time of failure = cohesion C + normal stresstanΦ
56 = 25 + 39tanΦ
Φ = angle if refractive index
Φ = 38.48⁰
This is approximately 39⁰
Therefore in answer to this question, the angle of internal friction for the soil is nearly 39⁰
S
The van der Waals equation is a modification of the ideal gas equation. What two factors does this equation account for? A. (1) Real gas molecules exert forces on each other. (2) Gas molecules have energy. B. (1) Real gas molecules exert ionic forces on each other. (2) Gas molecules have energy C. (1) Real gas molecules exert forces on each other. (2) Gas molecules have volume. D. (1) Real gas molecules exert ionic forces on each other. (2) Gas molecules have volume. E. None of the above have BOTH of the two factors accurately stated HINT: Check Van der Waals equation.
Answers
Answer:
E
Explanation:
The vander waals equation
[tex](P+n^2a/V^2)(V-nb)[/tex]=nRT
The factor n^2a/V^2 accounts for the attractive forces between the gases molecules whereas nb accounts for the decrease in volume occupied by the gas. Therefore, correct option would be E. None of the above have BOTH of the two factors accurately stated
The correction of Van Der Waal to the ideal gas equation is that; real gas molecules exert forces on each other and that gas molecules have volume.
Van Der Waal (1873) proposed a modification to the ideal gas equation; PV = nRT. The ideal gas law assumes that molecules of gases do not have a definite volume but occupies the same volume as the container and do not exert any attractive forces on each other.
However, Van Der Waal introduced two major corrections to the ideal gas equation;
The gas molecules have real volume, V - nb gives the volume of the container that is inaccessible to the gas molecules.The second correction has to do with the fact that the gases actually exert an attractive force on each other. The real pressure of the gas is less than the ideal pressure of the gas which is captured in the term; P + an^2/V^2.Hence, the ideal gas equation is now written as;
[tex](P + \frac{an^2}{V^2}) (V - nb) = nRT[/tex]
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define the power of a machine
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Answer:
Power of a machine is defined as its rate of doing work. It is the rate of transfer of energy. The power of a machine is said to be one watt if it can work at the rate of one joule in one second.
Explanation:
Signal loss is the reduction of a signal that occurs in a medium as a function of the physical length of the channel. This is known as:_________
a. degradation.
b. attenuation.
c. frequency degradation.
d. amplitude degradation.
Answers
Answer:
B) Attenuation
Explanation:
Attenuation can be regarded as the loss of signal strength which could be as a result of both external and internal factors. This loss of signal strength could occur in networking cables as well as other connections. Attenuation is a loss in energy, because as signal travels, its strength decreases as a a result of distance it covers, this loss of energy is due to the signal trying to overcome the resistance at the medium. One of the main the causes of attenuation is When there is Extra noise on available networks, networks such as electrical current as well as radio waves. It should be noted that attenuation is Signal loss which is the reduction of a signal that occurs in a medium as a function of the physical length of the channel.
Singnal attenuation can taken care of by using lower loss materials with high cost, instead of making of PCB routing length reduction. Amplifiers can also be engaged in amplifying attenuated signal to get back the original signal, this will compensate the loss.
Attenuation can be measured in decibels(dB), this gives the measurement of relative strengths of one signal at two different point or measurement of two signals.
What other ways could a wildfire be contained, extinguished, or slowed down?
Answers
What type of drill bit can produce a blind hole with a flat bottom
Answers
Answer:
end mill 4 flute
Explanation:
you can simply hook it up
Technician A says that some vehicle makers do NOT apply undercoating to the floor pan. Technician B says that some vehicle makers do NOT apply anti-corrosion compound to interior cavities. Who is right?
Answers
Answer:
Explanation:
Both technicians are right
Crank OA rotates with uniform angular velocity 0 4 rad/s along counterclockwise. Take OA= r= 0.5
m,AB2r,and BC 2r.For the instant, 45,OA is horizontal and AB is vertical.
determine the angular velocity and angular acceleration of BC.
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What project is this ?
Answers
Answer:
a building project...
Explanation:
Propyl Benzhydryl Ether (continued on next page):
(1) What volume of 1-pentanol is needed to convert 1.50 grams of benzhydrol to n-pentyl benzhydryl ether?
(2) Based on the results of this experiment, write a mechanism for the acid catalyzed reaction of benzhydrol with 1-pentanol to give the product from the last question. (Note: the mechanism is written on the first page of this experiment. You just have to figure out, based on the experimental results, which alcohol is ROH and which is R'OH and the write it using those two alcohols.)
(3) Under milder temperatures than what is needed for dehydration, strong acids catalyze the self-condensation of 1-propyl alcohol to give di-n-propyl ether. The mechanism differs from that of today's reaction in that the protonated alcohol undergoes an Sy2 rather than an Syl reaction. Write the mechanism for the acid catalyzed condensation of ethyl alcohol to give diethyl ether. Note: make sure your mechanism has the following three steps (a) protonation (b) Sx2 (not Syl) and finally (c) deprotonation.
Answers
Answer:
See detailed explanation and image attached
Explanation:
1 mole of 1-pentanol reacts with 1 mole of benzhydrol
Number of moles in 1.5 g of benzhydrol = mass/molar mass = 1.5 g/184 g/mol = 0.008 moles of benzhydrol
x moles of 1-pentanol reacts with 0.008 moles of benzhydrol
x = 0.008 moles of 1-pentanol
If 1 mole occupies 22.4 L
0.008 moles occupies 22.4 * 0.008 moles = 0.179 L of 1-pentanol is required.
The mechanism of the formation of n-pentyl benzhydryl ether involves the protonation of the -OH group in benzhydrol. This is followed by loss of water molecule creating a carbocation which is attacked by the 1-pentanol. Abstraction of a proton by a base completes the mechanism, regenerates the acid and yields the n-pentyl benzhydryl ether as shown in the image attached.
The synthesis of diethyl ether occurs by protonation of one ethanol molecule followed by SN2 attack by anothe ethanol molecule and a simultaneous loss of a water molecule. Deprotonation by a base yields the diethyl ether
A good place to get hints about how to answer a response question could be
a.
Your teacher
c.
Both of these
b.
The rest of the test
d.
None of these
Please select the best answer from the choices provided
A
B
C
D
Answers
Answer:
I think its A
Explanation:
...............................
what information should a professional engineer keep private
Answers
The Republican National Committee publishes a monthly digest of information for Republicans called .
Answers
Answer: The Republican
Explanation:
If a designer is developing a plan for a project in which the entire part is made out of ¾" thick plywood and he only wants to use one view, he should use the _______________ view.Immersive Reader Back Front Right Top
Answers
Answer: Front View.
Explanation:
Since the design of the developers for the project is based around creating a component with a 3⁄4 thick plywood. The only view he should consider should be the front view, so it will be easier to show the project to potential buyers or clients who are typically more concerned about aesthetics by using the front view.
Lucia is playing with magnetic toy vehicles. She has two identical toy vehicles (purple and pink) that start on opposite sides of a center magnet that cannot move. She moves both vehicles one space closer to the center magnet
Answers
Incomplete question. The remaining part of the question read;
How did the potential energy of the two vehicles change? Did the potential energy of one vehicle change more than the other? Why do you think so?
Explanation:
1. The potential energy of the two vehicles increased because we could observe that they have unlike poles moving towards the center of the magnet. So the magnet field would be repealing both toy vehicles.
2. The potential energy of the pink vehicle change more than the purple vehicle. This is evident as we notice the pink vehicle is closer to the center of the magnet than the other.
3. The reason for this is because Lucia exerts more force (potential energy) on the pink vehicle to fight the repelling effect of the magnet
Answer:
1. The potential energy of the two vehicles increased because we could observe that they have unlike poles moving towards the center of the magnet. So the magnet field would be repealing both toy vehicles.
2. The potential energy of the pink vehicle change more than the purple vehicle. This is evident as we notice the pink vehicle is closer to the center of the magnet than the other.
3. The reason for this is because Lucia exerts more force (potential energy) on the pink vehicle to fight the repelling effect of the magnet
Explanation:
Your friend has two substances A and B which are compressed liquid and superheated vapor respectively. Both are in rigid vessels. Your friend claims that when he cools down both substances they started to boil. Can this be true? Explain yourself using a T-v diagram.
Answers
Answer:
Following are the solution to the given question:
Explanation:
The material is necessary to cook since frying is a speedy process for evaporation.
Drug A is now in the compressed fluid area, and the material would not boil if the pressure is chilled. Because the ship is solid, its substance A claim is false.
Unless the volume comprises of a drop in the heat, the B substance reaches a vapor pressure area and a wet region. That's the area that melting may occur. His claim for material B could therefore be true.
The process by which natural forces move weathered rock and soil from one place to another is called
a)soil conservation. b)deposition. c)abrasion. d)erosion
Answers
Answer:
Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. A similar process, weathering, breaks down or dissolves rock, but does not involve movement.Erosion is the opposite of deposition, the geological process in which earthen materials are deposited, or built up, on a landform.
Most erosion is performed by liquid water, wind, or ice (usually in the form of a glacier). If the wind is dusty, or water or glacial ice is muddy, erosion is taking place. The brown color indicates that bits of rock and soil are suspended in the fluid (air or water) and being transported from one place to another. This transported material is called sediment.
Explanation:
Physical erosion describes the process of rocks changing their physical properties without changing their basic chemical composition. Physical erosion often causes rocks to get smaller or smoother. Rocks eroded through physical erosion often form clastic sediments. Clastic sediments are composed of fragments of older rocks that have been transported from their place of origin.Landslides and other forms of mass wasting are associated with physical weathering. These processes cause rocks to dislodge from hillsides and crumble as they tumble down a slope.
Landslides and other forms of mass wasting are associated with physical weathering. These processes cause rocks to dislodge from hillsides and crumble as they tumble down a slope.
Plant growth can also contribute to physical erosion in a process called bioerosion. Plants break up earthen materials as they take root, and can create cracks and crevices in rocks they encounter.
I HOPE I HELPED YOUTo attain maximum power delivered to a load, what value of load impedance is required if 1. the load can have any complex value; 2. the load must be pure resistance?
Answers
Answer:
Explanation:
Maximum power will be delivered to the load if
Z(load) = Z(t)*
If the Thevenin is defined as Z(t) = R(t) + jX(t), then the load impedance will be
Z(load) = Z(t)* = R(t) - jX(t)
Finding the equivalent impedance, we have that
Z(eq) = Z(t) + Z(load)
Simplifying further, we have
Z(eq) = R(t) + jX(t) + R(t) - jX(t)
Z(eq) = 2R(t)
Therefore, maximum power will be delivered to the load when Z(load) = Z(t)*
Maximum power will be delivered to a pure resistance table if
R(load) = |Z(t)|
Again, if we define the impedance of Thevenin, we have
Z(t) = R(t) + jX(t)
And therefore, our load resistance is
R(load) = √[R(t)² + X(t)²]
What are shims used for ?
Answers
When a retaining structure moves towards the soil backfill, the stress condition is called:__________.
(A) at rest state,
(B) active state.
(C) passive state.
(D) both (B) and (C)
Answers
Answer:
(C) passive state.
Explanation:
The earth pressure is the pressure exerted by the soil on the shoring system. They are three types of earth pressure which are:
a) Rest state: In this state, the retaining wall is stationary, this makes the lateral stress to be zero.
b) Active state: In this state, the wall moves away from the back fill, this leads to an internal resistance. Hence the active earth pressure is less than earth pressure at rest
c) Passive state: In this state the wall is pushed towards the back fill, this leads to shearing resistance. Hence, the passive earth pressure is greater than earth pressure at rest
A wheel barrow is used to lift a 150 lb load. The length from the wheel axle to the center of the load is 2 ft. The length from the wheel and axle to the effort is 6 ft. a. What is the ideal mechanical advantage of the system? b. Using static equilibrium calculations, calculate the effort force needed to overcome the resistance force in the system.
Answers
Answer:
[tex]3:1[/tex]
[tex]50\ \text{lb}[/tex]
Explanation:
[tex]F_r=150\ \text{lb}[/tex]
Mechanical advantage is will be the ratio of the distances from the wheel axle of the forces.
[tex]MA=\dfrac{6}{2}\\\Rightarrow MA=3:1[/tex]
The ideal mechanical advantage of the system is [tex]3:1[/tex].
The moment in the system is conserved so moment about the wheel axle is
[tex]M_e=M_r\\\Rightarrow 6F_e=2F_r\\\Rightarrow F_e=\dfrac{2F_r}{6}\\\Rightarrow F_e=\dfrac{2\times 150}{6}\\\Rightarrow F_e=50\ \text{lb}[/tex]
The required effort force is [tex]50\ \text{lb}[/tex].
17. When shopping around for a bank, you should consider all of the following EXCEPT: *
. Bank fees charged
B. Services provided by the bank
C. The bank teller's level of education
D. Minimum Balance you have to maintain
Answers
Answer: C. The bank teller's level of education
Explanation:
When shopping around for a bank, some of the factors that an individual should consider include the fees charged by the bank, the services provided by the bank and the minimum balance that one must have in order to maintain the account opened.
One is not concerned with the bank teller's level of education. This is the concern of the management of the bank and the human resource department. It is the management that will determine the kind of person they want any for the position and the level of education he or she must have.
Therefore, the correct option is C.
Calculate the number of vacancies per cubic meter at 1000∘C for a metal that has an energy for vacancy formation of 1.22 eV/atom, a density of 6.25g/cm^3, and an atomic weight of 37.4 g/mol.
(A) 1.49×10^18 m^−3
(B) 7.18×10^22 m^−3
(C) 1.49×10^24 m^−3
(D) 2.57×10^24 m^−3
Answers
Answer:
C
Explanation:
N = Na.P/A------(1)
Na = avogadro's number = 6.02210²³
P = density
A = atomic weight of metal
When we substitute into equation 1 above we get
1.0x10²⁹atoms/m³
From here we calculate the number of vacancies
T = 1000⁰c = 1273K
The formula to use is
Nv= Nexo(Qt/K.T) -----(2)
Qt = 1.22eV
K = Boltzmann's constant = 8.6210x10^-5
When we substitute values into equation 2
We get Nv = 1.49 x 10²⁴m-3
Therefore option c is correct
Check attachment for a more detailed calculation of this question
(A) Explain why residual thermal stresses are introduced into a glass piece when it is cooled.(B) Are thermal stresses introduced upon heating? Why or why not?
Answers
Answer:
Yes, they are
Explanation:
A
Assuming that a glass piece is cooled from an elevated temperature, then the internal stresses which are also called thermal stresses, gets inroduced due to result of the difference in cooling rate and that of the thermal contraction that exists between the surface and the interior regions. They can lead to fractures such as thermal shock, as a result, we deem these thermal stresses important.
B
Yes, they are. They are introduced upon heating due to the thermal expansion that takes place
What is the purpose of O-ring and valve seals in a cylinder head?
Answers
Answer:
its to show the shape is flat and only flat at the botom and top and you can set it up ther way and it wlll still look the same.
Explanation:
O rings and valve seals are used to block a path to prevent escape of a liquid or a gas.
What is cylinder head?The cylinder head controls air or fuel flow in and out of the cylinders.
The O ring in cylinder head is placed into a groove to secure them in place. They are compressed between two surfaces to have a seal pack. The O-ring or valve seal creates a air and liquid-tight mating surface.
Thus, O rings and valve seals are used to block a path to prevent escape of a liquid or a gas.
Learn more about cylinder head.
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please any one know how to find the unit hydrograph ????!!!!!!!!!!! its important
Answers
Answer:
roughly 13,or 12, or 11
Explanation:
what is the relationship between magnetism and electromagnetism and how does this effect voltage in a circuit?
Answers
Answer:
A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire. The amount of voltage induced depends on the rate of change of the magnetic field flux and the number of turns of wire (if coiled) exposed to the change in flux.
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A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire.
What is Electromagnetism?The amount of voltage induced depends on the rate of change of the magnetic field flux and the number of turns of wire (if coiled) exposed to the change in flux.
The interaction of the electromagnetic field, all electrically charged things, and all objects with magnetic moments.
One of the universe's four fundamental interactions is the electromagnetic interaction. This interaction includes all atomic, electrical, magnetic, and electromagnetic phenomena as well as light and light fields.
Therefore, A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire.
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