Medium Voltage Circuit Breaker
Usually, medium voltage circuit breaker is to protect the transformer from voltage spikes on a distribution transformer.
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For one-family dwellings, the service disconnecting means must have a rating of at least ___ amperes, 3-wire.
The rating of the service disconnecting means for a single-family home must be at least 100 amperes, 3-wire.Therefore, 100 amperes is the required minimum rating of service size for a one-family home.
What is the service's required minimum ampere rating?
NEC 230.79 (C) states that the rating of the service disconnecting mechanism for a one-family residence must not be less than 100 amperes, 3-wire.Therefore, 100 amperes is the required minimum rating of service size for a one-family home. In one enclosure, six switches or circuit breakers.Since the 1937 edition of the NEC, the number of switches or sets of circuit breakers that can be utilized as the service disconnecting mechanism to separate a building's premises wiring from the utility provider's conductors can range from one to six. The combined ratings of the circuit breakers, if the disconnecting method consists of more than one switch or circuit breaker, must not be less than the calculated load as established by Art. The 98 amp load for the single-family home will be supplied by a 100 amp electrical service.100 x 83 percent equals 83 amps.The bare minimum service conductor is this one. A revision made to the 2020 NEC mandates that an emergency disconnect be used in accordance with section 230.85.This disconnect is meant to allow emergency personnel to turn off the electricity to the entire house before entering to deal with the situation. Any combination of the following is authorized for the two to six service disconnecting means:separate enclosures, each with a method to disconnect the main service.a main service disconnecting mechanism built inside each panel board enclosure. All primary conductors of transformers that are not grounded must be disconnected using a disconnect.Unless the location of the disconnect is clearly written on the transformer and the disconnect is lockable, as is depicted in the Figure, it must be placed within sight of the transformer.To learn more about ampere rating refer
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consider an infinite wing with an naca 1412 airfoil section and a chord length of 3 the wing is at an angle of attack of 5 in an auflow velocity of 100 s at standard sea level conditions calculate the lift, drag, and moment about the quarter-chord per unit span
GIVEN DATA
CHORD LENGTH =3 FT
ANGLE OF ATTACK= 5 DEGREE C
Answer is attached in the form of images:
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a cylindrical tank is required to contain a gage pressure 770 kpa . the tank is to be made of a516 grade 60 steel with a maximum allowable normal stress of 150 mpa . if the inner diameter of the tank is 3 m , what is the minimum thickness, t , of the wall?
The minimum thickness (t) of the wall is 7.7 mm
Gauge pressure (P)=770 kpa
Allowable normal stress =150 Mpa.
The inner diameter of the tank =3m.
We need to ask ourselves how we can get the Minimum thickness of the wall.
We can have two cases if there is a closed cylinder
the first being Circumferential stress with the other being longitudinal stress.
According to circumferential stress
σ= pd/2t
Where
p=pressure,
d=diameter,
t= thickness,
then we substitute to make t the subject,
t=pd/2σ
t=770×10^3×3/2×150×10^6
t = 7.7 mm
minimum thickness (t) = 7.7 mm
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In the case-based reasoning r4 cycle by aamodth and piaza, a verified solution would be added to the case-base following what step in cycle?.
In the case-based reasoning R4 cycle by Aamodth and Piaza, a verified solution would be added to the case base following the step in the cycle called the Revise Step.
What is case-based reasoning?Case-based reasoning (CBR) is artificial intelligence and cognitive science paradigm that represents thinking as predominantly memory-based. Case-based reasoners handle new issues by collecting previously saved 'cases' documenting comparable earlier problem-solving events and customizing their answers to meet new requirements.
An issue (target) is addressed in CBR by doing the following steps:
(1) a similar instance, or historical experience (base), to the current situation is retrieved;
(2) the case is utilized to offer a solution;
(3) the proposal is reviewed; and
(4) faults with the solution are fixed.
Note that Case-based reasoning can be especially effective in situations where traditional rule-based reasoning is lacking, such as acquiring knowledge, machine learning, and reasoning with inadequate data. Prototype software applications are now being tested for their efficacy in problem-solving tasks utilizing the case-based reasoning technique.
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What is the main difference between zener diode and normal diodes
Answer:
Zener diode can operate in reverse bias mode whereas normal diode acts as an open circuit while in reverse bias mode
Explanation:
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_____ occur when warm, dry wind flows down a slope, whereas _____ occur when cold, dense air flows down a slope.
Chinook winds occur when warm, dry wind flows down a slope, whereas katabatic winds occur when cold, dense air flows down a slope.
What are Chinook winds?Chinook winds, sometimes known as 'Chinooks,' are two types of predominantly warm, mainly westerly winds in western North America: coastal Chinooks and inland Chinooks. The coastal Chinooks are rainy, southwesterly winds that come in from the ocean on a seasonal basis.
On the other hand, a katabatic wind is a draining wind, which transports high-density air from a higher height down a slope using gravity. Such winds are sometimes known as autumn winds; the term catabatic winds is often used.
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which bridge configurations produce a half-arm bridge for measuring strain due to the tension loading? (don't worry about the sign of the output, select all that apply)
The two portions of material on either side of a plane have a tendency to be drawn apart or lengthened under tension pressure. In contrast to tensile loading, compression entails forcing the material together.
Explain about the tension loading?
When two or more real things come in contact with one another, forces are applied between them. We refer to these contact forces by various names depending on the objects in contact. We refer to the force as tension if one of the items in contact is a string, rope, cable, or spring.
The force communicated through a rope, string, or wire when two opposing forces draw on it is known as tension. The tension force pulls energy equally on the bodies at the ends and is applied along the entire length of the wire. Every physical object in contact with another one applies some force to that object.
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A quiz contains 10 questions. There are four possible answers for each question.In how many ways can a student answer the questions on the test if the student can leave answers blank?
Answer:
Simple In one way. That is if he left it blank
When bracing is incorporated into the earthquake safety design of a building, it is generally constructed of steel because steel is?
When bracing is incorporated into the earthquake safety design of a building, it is generally constructed of steel because steel is flexible
In construction, a bracing system is used to stabilize the main girders, contribute to the distribution of load effects, and to provide resistance to compression chords.
The brazed frame system is designed to resist prevailing wind and earthquake forces. It uses two orthogonal concepts in bracing which are; vertical bracing system that provides lateral stability and load paths, and another type of orthogonal concept is horizontal bracing system used to transfer horizontal forces.
The bracing system is generally constructed of steel because, steel is efficient in providing stiffness and strength needed to resist the seismic load. Consequently, steel is expected to buckle and yield during strong earthquake shakes.
Thus, steel is generally flexible.
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frobenius method: solve xy''+y=0
Answer: X=0
Explanation: I think
construction expertise (e.g., by the construction firm) is typically included latest in the planning process in which arrangement?
The most common applications for micro piles are structural foundation support, underpinning, wall support, and slope stabilization.
The master format is a common outline for organizing information about building materials and components. Its primary divisions include topics such as sitework, concrete, masonry, metals, wood, and plastics, among others.) Seismic retrofitting or strengthening is done to improve the structural capacities (strength, stiffness, ductility, stability, and integrity) of the structure so that the building's performance level can be raised to withstand the design earthquake consideration.
The mass concrete underpinning method is the traditional underpinning method that has been used for centuries. The method entails extending the old foundation to a stable stratum. The soil beneath the existing foundation is excavated in stages orpins in a controlled manner.
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technician a says to correct ride height by performing a wheel alignment. technician b says to check for bent suspension components if ride height is incorrect. who is right?
Technician A is right due to the fact if one facet is exceptional in peak it'll motive a pull. Ride height motive camber and need to be corrected earlier than any alignment adjustments.
To check ride height you could observe those steps:
Park the automobile on stage floor.Roll the automobile ahead and lower back permitting the suspension to relax.Grab your tape degree.Starting on the the front drivers facet wheel, degree from the middle of the wheel to the middle of the fender starting and note.Ride height or floor clearance may be defined as the quantity of area among the bottom of an vehicle tire and the bottom factor of the vehicle (normally the axle); or, greater properly, to the shortest distance among a flat, stage surface, and the bottom a part of a automobile apart from the ones elements designed to touch the floor.
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Technician a says that a steering column may be designed to absorb energy technician b says that vehicle seats may be designed to absorb energy who’s right
Since Technician A says that a steering column may be designed to absorb energy and Technician B says that vehicle seats may be designed to absorb energy. The both of them ( Tech A and B) are right.
What does a car's steering column do?The rod that the steering wheel is mounted to is known as the steering column of a vehicle. On a shaft inside the steering column, the steering wheel is mounted. The steering inputs are delivered to the steering rack or box by the steering column.
A shaft that passes through the steering column is used to link the steering wheel to the shaft.
Therefore, The purpose of bumper reinforcements, which are often made of highly strong materials like UHSS or aluminum, is to spread the crash energy.
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Flaws occur in Mylar material according to a Poisson distribution with a mean of 0.01 flaw per square yard.
If 25 square yards are inspected, what is the probability that there are no flaws?
What is the probability that a randomly selected square yard has no flaws?
Suppose that the Mylar material is cut into 10 pieces, each being 1 yard square. What is the probability that 8 or more of the 10 pieces will have no flaws? Hint: Let V denote the number of square yards out of 10 that contain no flaws. Then, V is a binomial random variable with n = 10 and p=P(Y=0) (from part (b).
Using the Poisson distribution and the binomial distribution, it is found that:
There is a 0.0821 = 8.21% probability that there are no flaws on 25 square yards inspected.There is a 0.99 = 99% probability that there are no flaws on a randomly selected square yard.There is a 100% probability that 8 or more of the 10 pieces will have no flaws.What is the Poisson distribution?In a Poisson distribution, the probability that of x successes of a random variable is given by the following equation:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
The parameters are described as follows:
x: number of successes.e = 2.71828 is the Euler number[tex]\mu[/tex]: mean.For one square yard, the mean is:
[tex]\mu = 0.01[/tex]
Hence the probability that there are no flaws on 1 square yards is:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
[tex]P(X = 0) = \frac{e^{-0.01}(0.01)^{0}}{(0)!} = 0.99[/tex]
For 25 square yards, the mean is:
[tex]\mu = 0.01 \times 25 = 2.5[/tex]
Hence the probability that there are no flaws on 25 square yards is:
[tex]P(X = x) = \frac{e^{-\mu}\mu^{x}}{(x)!}[/tex]
[tex]P(X = 0) = \frac{e^{-2.5}(2.5)^{0}}{(0)!} = 0.0821[/tex]
What is the binomial distribution formula?The formula for the probability of x successes is:
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]
The parameters are given by:
n is the number of trials of the experiment.p is the probability of a success on a single trial of the experiment.For the probability that 8 or more of the 10 pieces will have no flaws, the values of the parameters are given by:
p = 0.99, n = 10.
The probability is:
P(X >= 8) = P(X = 8) + P(X = 9) + P(X = 10).
In which:
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]P(X = 8) = C_{10,8}.(0.99)^{8}.(0.01)^{2} = 0.0042[/tex]
[tex]P(X = 9) = C_{10,9}.(0.99)^{9}.(0.01)^{1} = 0.0914[/tex]
[tex]P(X = 10) = C_{10,10}.(0.99)^{10}.(0.01)^{0} = 0.9044[/tex]
Then:
P(X >= 8) = P(X = 8) + P(X = 9) + P(X = 10) = 0.0042 + 0.0914 + 0.9044 = 1 = 100%.
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an alloy steel metric 10x1.25 screw is used in a threaded hole and tightened to 20% of its proof strength of 830 mpa. determine the maximum torque that should be used if the torque coefficient
Maximum torque required = 41.6 N.m
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Match the cooling system types given below with the appropriate characteristics. Each cooling system type can be used once, more than once, or not at all.
a. Active heat sink
b. Liquid cooling
c. Passive heat sink
d. Power Supply:
- Used for cooling high-end video cards
- Has a fan attached to the heat sink
- Used for cooling CPUs
- Used for cooling high-end gaming computers
- Used for cooling high-performance systems
- Used for cooling memory modules
- Has no fan attached to the heat sink
- Exhausts hot air out of the back of the case
Active heat sink is used for the following: cooling high-end video cards, has a fan attached to the heat sink and used for cooling CPUs
Liquid cooling is used for the following: cooling high-end gaming computers and for cooling high-performance systems.
Passive heat sink is used for cooling memory modules, and has no fan attached to the heat sink
Power Supply is used for exhausts hot air out of the back of the case.
Active heat sink
Active heat sink is a type of cooling system that utilized forced air to increase fluid flow across heat area. It is used for:
Used for cooling high-end video cards Has a fan attached to the heat sink Used for cooling CPUsLiquid cooling
Liquid cooling is a type of cooling system that has higher thermal transfer efficiency than air cooling. It used for:
Used for cooling high-end gaming computersUsed for cooling high-performance systemsPassive heat sink
Passive heat sink is a passive heat exchanger that transfers heat generated by an electronic device, and pass it to a fluid medium. Generally, passive heat sink is used for:
Used for cooling memory modulesHas no fan attached to the heat sinkPower supply
Power supply uses internal heat sinks to conduct the heat away from hot devices. Generally, it used to:
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I'll give brainliest,pls help.in a small paragraph explain a series circuit,it's basically for a presentation 8th grade work
Answer:
electric circuit, a conduit for moving current. A battery or generator, a device that provides energy to the charged particles that make up the current, a device that uses current, such as a lamp, an electric motor, or a computer, and the connecting wires or transmission lines make up an electric circuit. Ohm's law and Kirchhoff's rules are two fundamental laws that quantitatively define how electric circuits function.
network in series
circuit parallel
There are various categories in which to place electric circuits. Only one direction of current can flow through a direct-current circuit. As in most residential circuits, an alternating-current circuit transports current that pulses back and forth repeatedly every second. (To learn more about direct and alternating current circuits, visit electricity: Direct electric
Explanation:
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which readability tool gives an indication as to how students will actually perform with course materials?
To determine how easy our content is to understand, the readability test tool employs the Flesch Kincaid reading ease test, the Flesch Kincaid grade level test, the Gunning Fog score, the Coleman Liau index, the Automated Readability Index (ARI), and the SMOG index.
Students find trade books to be more readable and engaging. They are more relevant to students and frequently allow students to make personal connections with the information. Many nonfiction trade books are written in the style of a novel. They can provide more up-to-date information. Almost any trade book can be used to support the development and reinforcement of literacy skills. Trade books, in addition to providing reading practice, can be used to support vocabulary development, story telling skills, writing skills, and even editing skills.
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Not all projects that engineers work on will have human factors involved.
List some projects that do and do not.
What are some additional examples?
Outline what particular types of human factors would be considered with each.
Provide examples to clarify your responses.
Projects that don't have human factors involved are:
The Use of Artificial Intelligence to Power Road Construction Robots;End to End robotic Automobile production line.Other projects that require human factors are;
Traditional road construction projects;Traditional building construction projects.What are the human factors for Road Construction?The role of human factors includes but is not limited to:
Operation of Heavy-Duty VehiclesHuman Resources (taking care of people)Finance operations (Finance and Accounting) etc.At construction sites, excavation is one of the roles of humans. Another instance is injuries, compensation, etc is the work of the Human Resources Officer.
Human factors include environmental, organizational, and job elements, as well as human and individual qualities that influence workplace behavior and can have an impact on health and safety.
Human-factors engineering has been applied to simple equipment such as highway signs, telephone sets, hand tools, and stoves, as well as a wide range of contemporary, sophisticated complexes such as data systems, automated warehouses, and factories. robots, and space vehicles.
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in conventional sheet metalworking operations, (a) what is the name of the tooling and (b) what is the name of the machine tool used in the operations?
(a) The tooling is called a punch-and-die. (b) The machine tool is called a stamping press.
Manufacturing ferrous or nonferrous metal goods, structural metal products, metal forgings, and metal stampings are all included in metalworking processes. They also involve a variety of other metal and wire goods, including silverware, watches, clocks, scientific measuring and regulating devices, and jewelry.
Punch and dies are a type of cutting tool equipment utilized in the high-heat metal forming process known as forging and punching. The cutting workpiece needs a "punch" to act as a pusher, and the punch pushes in the die as a secondary item.
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R1 = 7926 Ω, R2 = 327 Ω, and R3 = 5802 Ω, and 600 V is applied between A and B. What is the current flow through R3?
You add up the individual resistances to determine the total overall resistance of several resistors connected in this manner.The formula used for this is as follows:Total R = R1 plus R2 plus R3 and so on
Solve the problem ?According to symmetry a and b are at same potential. So current in R3 is zero.The following equation can be used to calculate the TOTAL RESISTANCE in a parallel circuit: 1/Rt = 1/R1 + 1/R2 + 1/R3 "Remember what we stated at the beginning of this section before we begin the calculations: "A parallel circuit's total resistance is not equal to the sum of its resistors (like in a series circuit). The current through R2 is V2/R2 because R2 appears to be grounded (to source V2), and the current through R3 is V3/R3 because R3 appears to be grounded.The voltage drop in RF, and consequently the output voltage, are equal to (Iin + V2/R2 V3/R3)RF, much like for current sources.Diagram 30-11. The electric potential difference (V) across each resistor in a parallel circuit is the same.Ohm's law states that I = V / R applies to the current in a resistor.The current will be lowest where the resistance is highest since the V is the same for each resistor.To learn more about resistances refer
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What describes what happens when a neuron sends a signal?
When a neuron sends a signal, they create electrical events called actions potentials and chemical neurotransmitters.
Basically, a neuron is a fundamental units of the brain and nervous system. They are nerve cells responsible for: receiving sensory input from the external world, sending motor commands to the muscles, and for transforming and relaying electrical signals.
Being that neurons also communicates, they do so using electricals and chemicals means. So one neuron can communicate to the other via electrical events which are action potentials and chemical neurotransmitters.
An action potential causes one neuron to release chemical neurotransmitter which will help or hinder the other neuron from firing its own action potential.
In summary, neurons are essentially electrical devices having action potentials and chemical neurotransmitters as the fundamental units of sending signals or communicating with other neurons.
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