Given information is as follows Contract value = RM 13,800,500.00Prime Cost Sum = RM 100,500.00Provisional Cost Sum = RM 100,500.00Value of work done = RM 3,500,000.00Value of materials on site = RM 20,000.00
The formula for calculating the recoupment of advance payment is given as, Recoupment of Advance Payment = (Total Advance Payment × Percentage of Work done) / 100As per the question, the advanced payment shall be recouped when the value of the works executed and certified in the progress payment certificates reaches a certain percentage of the total contract value. This also shall be based on the recoupment formula provided for in the terms of the contract. So, we need to calculate the percentage of work done, let us calculate it. Calculation of Percentage of Work DoneThe percentage of work done is given as the ratio of the value of work done to the total contract value. Adding up the Prime Cost Sum and Provisional Cost Sum.
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Whether the following statement is true (T) or false (F) (2 scores each, total 20 scores)
1. A V-shaped river valley is the result of tectonic uplift and vertical erosion of rivers. ( )
2. An aquifer confined between two aquicludes must be a confined aquifer. ( )
3. The strength of rock masses is well correlated to the strength of their rock blocks. ( )
1. True (T):- A V-shaped river valley is a type of valley that is formed by river erosion and tectonic uplift.
The V-shape of the valley is formed when the river erodes downwards into the bedrock, cutting through the softer layers and creating steep sides. Tectonic uplift, which is caused by geological forces, raises the land surface and exposes the rock formations to weathering and erosion. This process results in the formation of a V-shaped river valley.
2. False (F):- An aquifer confined between two aquicludes may or may not be a confined aquifer. A confined aquifer is an aquifer that is completely surrounded by impermeable rock layers, such as shale or clay. These layers prevent water from seeping into or out of the aquifer. If an aquifer is confined between two aquicludes, it may or may not be completely surrounded by impermeable rock layers. Therefore, it cannot be assumed that the aquifer is a confined aquifer.
3. False (F):-The strength of rock masses is not always well correlated to the strength of their rock blocks. Rock blocks, or individual pieces of rock, may have different strength properties than the larger rock mass that they are a part of. For example, a large rock mass may be made up of different types of rock with varying strength properties.
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2. Disinfection: The process of Ultraviolet Irradiation (generated by low pressure mercury vapor lamps) is the most widely used primary disinfection process in modern drinking water treatment plants in the United States and abroad, while chlorination is the most widely used approach for secondary disinfection (only applied in the United States)
a) Describe the reason(s) why UV Irradiation generated using LPMVL is an effective primary disinfectant. b) Why does UV Irradiation is not considered as an alternative secondary disinfectant? c) Describe the main property of chlorine in water that makes it the best choice as secondary chemical disinfectant .
a) Reasons why UV Irradiation generated using LPMVL is an effective primary disinfectant: Ultraviolet irradiation (UV) is a reliable, cost-effective technique that does not introduce any chemical substances to the water, making it a desirable disinfectant option.
This method employs UV lamps to radiate UV rays, typically in the 254-nm range, in a low-pressure mercury vapor lamp (LPMVL).UV disinfection inactivates a variety of bacteria, viruses, and protozoa, including those that cause Cryptosporidiosis and Giardia.
b) While UV disinfection is effective against most bacteria and viruses, it is not as effective against cysts, which are protozoan organisms with a thick outer shell that protects them from UV radiation. The cysts are not killed but become inactive when conditions are favorable, they can become active again and continue to cause illnesses.
c) The main property of chlorine in water that makes it the best choice as a secondary chemical disinfectant: Chlorination is the most commonly used secondary disinfectant in drinking water treatment facilities. Chlorine has a number of beneficial characteristics, including being a strong oxidant that can quickly inactivate many pathogens, including bacteria, viruses, and cysts.
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In California, what Statute states the requirements of Home Improvement Contracts? Code of Civil Procedure 339 Business and Professions Code 7159 Labor Code 3803 Labor Code 5813
In California, the statute that states the requirements of Home Improvement Contracts is the Business and Professions Code 7159.Home Improvement Contracts Home improvement contracts are a type of legal agreement between a homeowner and a contractor.
These contracts stipulate the terms of the project, such as the work that needs to be completed, the timeline for completion, and the payment schedule. The state of California has specific laws that govern these contracts and protect both the homeowner and the contractor.Business and Professions Code 7159The Business and Professions Code 7159 is the statute that sets forth the requirements for home improvement contracts in California. This statute requires that all home improvement contracts be in writing and contain certain information, such as the contractor's name and address, the scope of the work to be done, and the contract price.
Additionally, the statute requires that the contractor provide the homeowner with a written notice that outlines the homeowner's right to cancel the contract within three business days. If the contractor fails to comply with these requirements, they may be subject to penalties and fines.The purpose of these requirements is to ensure that homeowners are fully informed about the terms of the contract and to prevent contractors from engaging in deceptive or unfair practices. By requiring all home improvement contracts to be in writing and providing homeowners with a right to cancel, the state of California aims to protect consumers and promote fair and honest business practices.
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List and briefly explain the known toughening mechanisms for concrete.
Concrete is a established building material known for allure substance and persistence. To enhance toughening and resistance to breaking, miscellaneous toughening methods are employed.
What is the toughening mechanisms?One can use: Aggregate Interlock: This device depends the meshing action betwixt rude aggregates inside the concrete origin. The coarse surfaces of aggregates create frictional opposition, growing the overall determination of the material.
Fiber Reinforcement: Adding fibers, such as fortify, mirror, or artificial fibers, to concrete can advance allure determination. These fibers act as data processing machine-reinforcements, connecting cracks etc.
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.
As an Irrigation Facility Manager, indicate how you will undertake:
a) Sector level social and economic M&E
b) Project level social and economic M&E
c) Explain why you think it is important to undertake sector and project level social and economic M&E
As an Irrigation Facility Manager, undertaking sector level social and economic M&E is essential to track the impact of the irrigation program
1. Identifying social and economic indicators - The first step is identifying the right social and economic indicators to use to measure the impact of the irrigation facility.
2. Baseline assessment - The next step is to conduct a baseline assessment. The baseline assessment helps to understand the social and economic situation before the intervention.
3. Monitoring and evaluation - Regular monitoring and evaluation are necessary to track the progress of the irrigation facility. This could be achieved through site visits, stakeholder meetings, and progress reports.
4. Data analysis - Data collected should be analyzed to determine the impact of the facility. This will help in identifying areas that require improvement.
The following are the ways in which I would go about undertaking project level social and economic M&E.
1. Identify the objectives of the project - The first step is to understand the objectives of the project. This helps in identifying the appropriate social and economic indicators.
2. Monitoring and evaluation - Regular monitoring and evaluation of the project is necessary to track progress and identify areas that require improvement. This could be achieved through site visits, stakeholder meetings, and progress reports.
3. Data analysis - Data collected should be analyzed to determine the impact of the project. This will help in identifying areas that require improvement.
4. Developing feedback mechanisms - Developing feedback mechanisms is important in identifying any issues that the stakeholders may have. This could be achieved through focus groups, questionnaires, and surveys.
This helps in ensuring that the project is on track and achieving its objectives.
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Alpha Metal Engineering core business ismanufacture metal grills and fencing. They need to perform a risk assessment at their premises as ordered by DOSH highlighted during their last factory visit. Due to this reason they need to generate a process mapping to end-to-end process documentation, such as Suppliers, Inputs, Process, Outputs, & Customers (SIPOC) before creating the Failure Mode Effects Analysis (FMEA).
Using the FIVE process below, create a SIPOC diagram that represent the situation at Alpha Metal Engineering:
Cutting.
Welding
Machining
Punching
Stamping
Create the risk assessment using FMEA for all the FIVE process above represents the situation at Alpha Metal Engineering.
In the FMEA, each process is analyzed for potential failure modes and their effects. By identifying these failure modes and their effects, Alpha Metal Engineering can prioritize risk mitigation strategies, improve process controls, and enhance overall product quality and reliability.
SIPOC Diagram for Alpha Metal Engineering:
Process: Cutting
Suppliers: Raw material suppliers, Cutting tools suppliers
Inputs: Raw materials (metal sheets), Cutting tools, Design specifications
Process: Cutting metal sheets according to design specifications
Outputs: Cut metal sheets
Customers: Welding process, Machining process, Assembly process
Process: Welding
Suppliers: Cut metal sheets from Cutting process, Welding equipment suppliers, Welding consumables suppliers
Inputs: Cut metal sheets, Welding equipment, Welding consumables, Welding specifications
Process: Joining metal sheets through welding process
Outputs: Welded metal sheets
Customers: Machining process, Assembly process, Quality control
Process: Machining
Suppliers: Welded metal sheets from Welding process, Machining tools suppliers
Inputs: Welded metal sheets, Machining tools, Machining specifications
Process: Shaping and finishing metal sheets through machining operations
Outputs: Machined metal sheets
Customers: Punching process, Stamping process, Assembly process
Process: Punching
Suppliers: Machined metal sheets from Machining process, Punching tools suppliers
Inputs: Machined metal sheets, Punching tools, Punching specifications
Process: Creating holes or shapes in metal sheets through punching
Outputs: Punched metal sheets
Customers: Stamping process, Assembly process, Quality control
Process: Stamping
Suppliers: Machined metal sheets from Machining process, Stamping tools suppliers
Inputs: Machined metal sheets, Stamping tools, Stamping specifications
Process: Forming metal sheets into desired shapes through stamping
Outputs: Stamped metal sheets
Customers: Assembly process, Quality control, End customers
FMEA (Failure Mode Effects Analysis) for Alpha Metal Engineering:
Process: Cutting
Failure Modes:
1. Incorrect cutting dimensions
2. Cutting tool failure
3. Material deformation during cutting
4. Inaccurate alignment of metal sheets
Effects:
1. Inaccurate parts and components
2. Waste of materials
3. Production delays
4. Increased rework and scrap
Process: Welding
Failure Modes:
1. Incomplete welds
2. Welding equipment failure
3. Insufficient weld penetration
4. Weld distortion or warping
Effects:
1. Weak or unreliable welds
2. Structural integrity issues
3. Weld defects leading to quality problems
4. Production delays and rework
Process: Machining
Failure Modes:
1. Tool breakage
2. Incorrect machining dimensions
3. Poor surface finish
4. Misalignment of machining operations
Effects:
1. Inaccurate parts and components
2. Waste of materials
3. Increased rework and scrap
4. Production delays
Process: Punching
Failure Modes:
1. Tool wear or breakage
2. Misalignment of punching operations
3. Incorrect hole sizes or shapes
4. Material deformation during punching
Effects:
1. Inaccurate holes or shapes
2. Structural integrity issues
3. Production delays and rework
4. Waste of materials
Process: Stamping
Failure Modes:
1. Tool wear or breakage
2. Incorrect stamping dimensions
3. Incomplete stamping of shapes
4. Material deformation or tearing
Effects:
1. Inaccurate shapes or parts
2. Structural integrity issues
3. Production delays and rework
4. Waste of materials
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It takes 5 days for the delivery of
198
Au grains for the implantation in carcinoma of the prostate. The activity must be Calculate what the activity at the time of dispatch must be, in order for it to be 185MBq per grain upon arrival. (Consult and quote a credible online source / text for the half-life of
198
Au. Write the half-life to two decimal places.)
The activity at the time of dispatch must be approximately 670.15 MBq in order for it to be 185 MBq per grain upon arrival.
To calculate the activity at the time of dispatch, we need to know the half-life of 198Au, which is the time it takes for half of the radioactive material to decay. According to a credible online source, the half-life of 198Au is approximately 2.7 days.
Using the half-life, we can calculate the decay factor, which represents the fraction of the radioactive material that remains after a certain period of time. The decay factor can be calculated using the formula: decay factor = [tex]0.5^(^t^/^h^)[/tex], where t is the time and h is the half-life. In this case, the time is 5 days, so the decay factor is [tex]0.5^(^5^/^2^.^7^).[/tex]
Since we want the activity per grain upon arrival to be 185 MBq, we can divide this value by the decay factor to find the initial activity required. The initial activity = 185 MBq / decay factor.
Therefore, the activity at the time of dispatch must be approximately 670.15 MBq in order for it to be 185 MBq per grain upon arrival.
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Determine the flash point, in ft, as a function of reservoir temperature (300°F) under the following conditions:
Py = Psat + 500, Ibf/in^2
Mass flow = 100,000 Ibm/h
f= 0.008
DC= 5 (Ibf/in^2)/(lbm/s)
D = 7-5/8"
The flash point is 1,086,496 ft.
The flash point is the temperature at which a liquid fuel produces enough vapor to ignite in air, when exposed to an ignition source, to burn briefly or flashover. It is a temperature rating that is essential to know when dealing with flammable substances.
Given conditions are:
Py = Psat + 500, Ibf/in²
Mass flow = 100,000 Ibm/h
f = 0.008
DC = 5 (Ibf/in²)/(lbm/s)
D = 7-5/8"
The following formula is used to determine flash point:
Q = (mf * f * (Py - Psat)) / DC
For f, the fraction of the volume of the fuel that is liquid at standard conditions is used. The values of "Py" and "Psat" can be computed using the Antoine equation for "Py" and the Clausius-Clapeyron equation for "Psat".
According to the equation mentioned above, the flash point can be computed as:
Q = (mf * f * (Py - Psat)) / DC
Calculation:
Py = Psat + 500
Py = 142.67 + 500
Py = 642.67 Ib/in²
Q = (mf * f * (Py - Psat)) / DC
Q = (100000 * 0.008 * (642.67 - 142.67)) / 5
Q = 1,086,496 fz
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Contrast a Continuously Mixed Flow reactor and a Plug flow
reactor and indicate under which circumstances each reactor will be
applicable
CSTR and PFR are two common types of chemical reactors. CSTR is suitable for liquid-phase reactions with long reaction times, while PFR is ideal for gas-phase reactions with short reaction times and high heat generation. CSTR is commonly used in wastewater treatment and large-scale processes, while PFR finds application in fast chemical reactions and industrial processes.
Plug Flow Reactor (PFR) and Continuously Stirred Tank Reactor (CSTR) are two common types of chemical reactors. The reactor's characteristics determine the type of reaction that can occur within it.
Continuously Stirred Tank Reactor (CSTR)
In a Continuously Stirred Tank Reactor (CSTR), the reactants are continuously fed into the tank, mixed, and then allowed to exit the reactor. The reactants are thoroughly combined, and the reactor contents are constantly homogenized. This means that the concentration of the reactants is uniform throughout the reactor. It is used to handle systems that have a long reaction time and a high degree of uniformity. This reactor type is ideal for liquid-phase reactions.
Plug Flow Reactor (PFR)
In a Plug Flow Reactor (PFR), the reactants are fed into a long, tubular reactor. The reactants only flow in one direction in this reactor, hence the name. As a result, there is no axial mixing in this reactor. The reactants are continuously fed into the reactor's front end and then allowed to exit the reactor at the back end. This reactor is ideal for gas-phase reactions where short reaction times are required. In comparison to CSTRs, PFRs have a high degree of concentration change across the reactor. It is important to note that PFRs can only be used for exothermic reactions that generate a lot of heat, since they are inherently isothermal.
Circumstances for each reactor type:
CSTRs are often used in situations where the process has a long residence time, which means that the reactants must remain in the reactor for an extended period of time to achieve the desired reaction. CSTRs are frequently used in wastewater treatment plants, which can run continuously and are particularly well-suited for anaerobic digestion processes. CSTRs are also well-suited for large-scale processes, such as the production of antibiotics and biological drugs.
PFRs are frequently used for fast chemical reactions, such as the production of polymers, that require a small residence time. Furthermore, PFRs can only be used for exothermic reactions that generate a lot of heat, since they are inherently isothermal. As a result, they are often used in industrial chemical processes, such as the synthesis of chemicals and the production of petroleum products. PFRs are most commonly used in gas-phase reactions.
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Sufficient working space needs to be maintained around electrical equipment. Proper marking and identification of all electrical equipment
Maintaining sufficient working space around electrical equipment is of utmost importance in ensuring workplace safety. The National Electric Code (NEC) mandates that at least 3 feet (36 inches) of clear working space shall be provided around electrical equipment such as switchboards, panelboards, and motor control centers.
Additionally, proper marking and identification of all electrical equipment is crucial for safety and efficiency. Each piece of equipment should be labeled with a unique and clear descriptions of its purpose and function. This helps to avoid confusion and ensure that the right equipment is being worked on at all times.
Furthermore, electrical equipment should be marked with the appropriate warning labels to indicate the hazards associated with its use. For example, high voltage equipment should be clearly labeled with warnings about the potential for electric shock and the proper safety precautions to be taken.
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Which of the two options is the best to acquire trucks for your company (interest rate is 10% per year). Show all your calculations including end values using correct units. Option 1: Purchase for $21,500 and after 5 years sell for $8,000 Option 2: Purchase the trucks with a time payment plan: Down payment $6,000; $3,500/year at the end of the year for 4 years; Assume you can sell the trucks after 5 years for $6,000 each
The best option to acquire trucks for the company would be to purchase the trucks using the time payment plan. We have two options:
Option 1: Purchase for $21,500 and after 5 years sell for $8,000
Option 2: Purchase the trucks with a time payment plan: Down payment $6,000; $3,500/year at the end of the year for 4 years; Assume you can sell the trucks after 5 years for $6,000 each
Option 1: In this option, the initial cost of purchasing the truck is $21,500. After 5 years, the truck can be sold for $8,000. Therefore, the net cost of the truck after 5 years would be: Initial cost - Resale value =
$21,500 - $8,000 = $13,500
Option 2: In this option, the cost of purchasing the truck is done through a time payment plan. The down payment is $6,000 and the payment at the end of each year for 4 years is $3,500.
Therefore, the total cost of the truck would be: Down payment + Annual payment × Number of years=
$6,000 + $3,500 × 4= $6,000 + $14,000= $20,000After 5 years, each truck can be sold for $6,000. Therefore, the net cost of each truck after 5 years would be:
$20,000 - $6,000 = $14,000 we can see that option 2 would be the best option as the net cost of each truck after 5 years is less than that in option 1.
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Sewerage waste was discharged into Mulungushi River from Mugochi lodge which is located along the banks of the river as they had a problem with a septic tank since it was full. This problem normally normally occurs in the rain season and this resulted in a mixture having DO of about 9 mg/L. The average occupancy rate monthly is about 70%. The septic tanks are emptied after every two weeks. After 5 days, DO dropped to 3 mg/L when ZEMA carried out the analysis of the water sample in the river. The reaction constant rate k was found to be 0.22 day-1 and the oxygen consumed in the first five days was 200 mg/L.
What would be the ultimate carbonaceous BOD?
What will be the remaining oxygen demand after 5 days?
What advise can you give to the to the lodge owner as a Civil Engineer?
Carbonaceous biochemical oxygen demand (CBOD) refers to the organic matter's oxygen-demanding capacity in wastewater. The amount of oxygen required for aerobic bacteria to break down the carbonaceous organic matter in wastewater over a specific period is referred to as carbonaceous biochemical oxygen demand (CBOD).
The ultimate carbonaceous BOD is defined as the total amount of organic material present in a wastewater sample that is oxidized to CO2 under controlled conditions over an extended period. It is usually abbreviated as BOD5 in milligrams of oxygen per litre (mg/L) or parts per million (ppm).
The equation to calculate the ultimate carbonaceous BOD is: Ultimate BOD =
Initial BOD - (Oxygen consumed in the first five days / 0.65) = [tex](1000 - 200) - (200 / 0.65) = 1077 mg/L[/tex].
Therefore, the ultimate carbonaceous BOD is 1077 mg/L.2. The remaining oxygen demand after 5 days can be calculated as follows:
[tex]BOD5 - CBOD5 = 200 - (3 x (1 - e-k*t)) = 22.15 mg/L.[/tex]
Therefore, the remaining oxygen demand after 5 days is [tex]22.15 mg/L.3[/tex].
They can hire a septic tank pumping service to ensure that the septic tank is emptied and cleaned regularly. The lodge owner can construct a subsurface flow wetland as a long-term solution. The subsurface flow wetland is an efficient and cost-effective method of treating wastewater.
It cleans water by using natural processes that take place in wetland ecosystems.
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Ten identical pipes connect an upstream reservoir A (water elevation 95 m) to a downstream reservoir B (water elevation 70 m). The elevations of the pipe nodes are given by dashed contour lines with the contour elevations indicated (in metres). Each pipe has a 250 mm diameter, is 200 m long and has a 'C' value of 130.
a) Determine the total flow through this pipe system.
b) Determine the maximum and minimum pressure head in the system.
c) Which branch conveys the highest flow: Branch P1-P2-P4-P5-P8 or Branch P3-P6-P7-P9? Why?
a) Calculation of Total flow rate To calculate the total flow rate through the pipe system, we use the following formula:$$Q=\frac {vA}{n} $$Where Q is the flow rate, v is the average velocity, A is the cross-sectional area of the pipe, and n is the Manning's coefficient of the material.
Here, the diameter of each pipe is 250 mm or 0.25 m. The area of a circle of radius 0.125 m is given by πr², which is 0.0491 m². The velocity of the flow is not given, so we need to calculate it. Since the pipes are all the same size and length, we can assume that the frictional loss in each pipe is equal, and we can calculate the total head loss as the sum of the head loss in each pipe.
To calculate the head loss in each pipe, we use the Darcy-We isbach equation:$$hf=\frac{fL}{D}\frac{v^2}{2g}$$Where hf is the head loss due to friction, f is the friction factor, L is the length of the pipe, D is the diameter of the pipe, v is the velocity of the flow, and g is the acceleration due to gravity (9.81 m/s²).
The friction factor depends on the Reynolds number, which is given by: $$Re=\frac{vD}{\nu}$$Where ν is the kinematic viscosity of the fluid, which is 1.004 × 10⁻⁶ m²/s for water at 20°C. Since the flow is turbulent, we use the Colebrook equation to calculate the friction factor:
We can solve this equation for f using the Newton-Raphson method. Since the elevation of the upstream reservoir is 95 m and the elevation of the downstream reservoir is 70 m, the total head loss due to elevation is 25 m. The elevation head loss is given by:
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One of the following is the most suitable cement type for crack-free pavements and slabs:
Jet cement
HAC
Type IV
Expansive cement
Type V
Among the given options, expansive cement is the most suitable cement type for crack-free pavements and slabs. Here’s why: Expansive cement, also known as shrinkage-compensating cement, is a type of cement that is specially designed to counteract the contraction of concrete that occurs during the drying process.
This makes it a good choice for use in situations where cracking is a concern, such as in the construction of pavements and slabs. Expansive cement, unlike other cement types, contains special ingredients that enable it to expand slightly as it dries. This expansion helps to offset the contraction of the concrete, preventing cracking and ensuring a smooth, durable surface. Other types of cement like Jet cement, HAC, Type IV, and Type V are not specifically designed for crack resistance and are more suited for other applications, such as high-temperature applications, marine environments, and low-heat applications. Therefore, for crack-free pavements and slabs, expansive cement is the most suitable cement type.
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6-The quality of being able to discern alternate solutions to moral dilemmas is referred to as
a) Moral imagination
b) Moral awareness
c) Moral communication
d) Moral autonomy
7-Which of the following statements is true of ethics?
a) It is the psychological analysis of human behaviour
b) It varies across social and cultural differences
c) It is the systematic analysis of behavioral choice that humans make
d) It is the decisions that humans make
8-In Canada, engineering professional associations
a) Are governed by international law
b) Are governed by federal law
c) Draw their authority from a dedicated law that governs their actions
d) Draw their authority from the ability to give engineering degrees
9-We can analyze the ethical content of a decision in five steps. Identify the correct sequence for
analyzing the decision:
a) Obtain relevant information, Consider a range of actions, Clarify key concepts, Identify relevant moral
values, and Make a reasonable decision
b) Identify relevant moral values, Clarify key concepts, Obtain relevant information, Consider a range of
actions, and Make a reasonable decision
c) Clarify key concepts, Obtain relevant information, Identify relevant moral values, Consider a range of
actions, and Make a reasonable decision
d) Consider a range of actions, Identify relevant moñal values, Obtain relevant information, Clarily key
concepts, and Make a reasonable decision
10-A feudal society was not
a)Marked by extreme inequality
b) Present in medieval Europe
c) Differentiated into a hierarchy of royalty, nobility, landlords and peasants
d)Associated with free movement across social levels
6. The quality of being able to discern alternate solutions to moral dilemmas is referred to as Moral imagination. Moral imagination is an ability to connect a moral problem to the solutions to that problem.
This process is based on an individual’s knowledge of moral concepts and ability to reason through ethical conflicts.7. The following statement is true of ethics - It varies across social and cultural differences. Ethics is not universal and vary from one culture to another.
The process of ethics determines what is wrong and right in a particular society. Thus, what may be considered ethical in one society may be regarded as unethical in another society. 8. In Canada, engineering professional associations draw their authority from a dedicated law that governs their actions.
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A 4.42km long pipeline of cast iron discharging water at a rate of 45L/s through a valve placed at the downstream end. The internal diameter of the pipe is 20cm and the wall thickness is 15mm. (Ewater=2.17*109 N/m2; Ep=16*1011 N/m2 and Poisson ratio of cast iron pipe = 0.25). Assuming the rigid pipe wall,
(a) If the valve is suddenly closed in 2 secs completely, calculate the magnitude of the surge pressure generated by the sudden and complete valve closure. [6 marks]
(b) Sketch the variation in surge pressure at the valve and at the mid-point of the pipeline after valve closure
(a) The magnitude of the surge pressure generated by the sudden and complete valve closure is 63.9 MPa. (b) The sketch of the variation in surge pressure at the valve and at the mid-point of the pipeline after valve closure.
Modulus of elasticity of water, Ewater = 2.17 × 10⁹ N/m² Bulk modulus of elasticity of cast iron pipe, Ep = 16 × 10¹¹ N/m²Poisson's ratio of cast iron pipe, µ = 0.25Time taken to close the valve, t = 2 s
Density of water, ρ = 1000 kg/m³The cross-sectional area of the pipe,
[tex]A = πd²/4 = π/4 × (0.2)² = 0.0314 m²[/tex]
The volume of water discharged in 2 seconds,
[tex]V = Qt = 45 × 2 = 90 L = 0.09 m³[/tex]Change in velocity,
[tex]∆v = Q/A = 45/0.0314 = 1432.48 m/s[/tex]
The initial velocity of water,[tex]u = Q/(π/4 × (0.2)²) = 143.24 m/s[/tex]
Pa Surge pressure = ∆P + (density of water × g × L) = [tex]1492.7 × 10³ + 1000 × 9.81 × 4420 = 63.88 MPa≈ 63.9 MPa[/tex]
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R-134a is the working fluid in a refrigerator, with a
minimum temperature of −10∘C and a maximum pressure of 1 MPa.
Assume an ideal refrigeration cycle. Find the QC, QH, and the COP.
(Hint: see ap
The refrigeration effect QC is 18.42 kJ/kg, the heat rejected QH is -98.25 kJ/kg, and the coefficient of performance (COP) is 1.1765.
5.
Given Data:
R-134a is the working fluid in a refrigerator with a minimum temperature of -10°C and a maximum pressure of 1 MPa. Assume an ideal refrigeration cycle.
To determine:
The QC, QH, and the COP.
Solution:
Using the provided formulas and data, we can calculate the refrigeration effect QC, the heat rejected QH, and the COP.
QC = m × (h1 - h4)
QC = 1 × (98.58 - 80.16)
QC = 18.42 kJ/kg
QH = m × (h2 - h3)
QH = 1 × (114.25 - 212.5)
QH = -98.25 kJ/kg
COP = QC / Wnet
Wnet = m × (h2 - h1)
Wnet = 1 × (114.25 - 98.58)
Wnet = 15.67 kJ/kg
COP = QC / Wnet
COP = 18.42 / 15.67
COP = 1.1765
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can
someone do a detailed design of flexible pavement. Everything
should be included. thanks
Flexible pavements are those pavements that will transmit the wheel load stresses to the lower layers by grain-to-grain transfer through the points of contact in the granular structure. Flexible pavements are constructed with the unbound aggregate layers with bitumen or cement for stability.
Step 1: The first step in the design of a flexible pavement is to determine the traffic loads it will be subjected to. This can be done by taking into account the number of axles, axle load, and tire pressure of the vehicles that are expected to use the pavement.
Step 2: The subgrade strength is an important factor in determining the thickness of the pavement. It is determined by carrying out a California Bearing Ratio (CBR) test on the soil at the proposed site.
Step 3: The design life is the period during which the pavement is expected to remain in good condition without the need for major repairs. The design life is usually between 15 and 20 years for flexible pavements.
Step 4: The materials used in the construction of the pavement depend on the traffic loads, subgrade strength, and design life. The materials typically used in flexible pavements include granular materials, bitumen, and cement.
Step 5: The pavement thickness is calculated using the equivalent standard axles (ESALs), subgrade strength, and design life. The thickness is determined using a pavement design chart or an iterative process using a computer program.
The design process for flexible pavement is a complicated process that requires several steps to be taken in order to ensure the pavement will meet the expected design life.
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QUESTION 1 10 points Stability is a fundamental feature of a Lean production system. Use your knowldge of lean to discuss the tools / concepts which in your opinion support directly or indirectly a lean's system stability and explain their contribution in it.
Stability in a Lean production system is a fundamental feature that enables an organization to remain profitable, efficient, and competitive. To achieve this, a range of tools and concepts are applied directly or indirectly to support stability in the Lean system.
Below are some of these tools and concepts:1. Standard Work: This is a Lean tool that provides a stable environment for employees by defining the correct way of performing a job. It helps to eliminate variations and ensures that employees work in a consistent manner, which results in higher efficiency, fewer defects, and improved quality.2. Visual Management:
This Lean concept involves the use of visual aids to provide employees with immediate feedback about their performance, highlighting any variations in performance. It provides a simple and effective way of communicating the status of production, so employees can quickly identify areas that require improvement.
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You Are Looking To Calculate The Earned Value For A Project With A Project Plan That Had A Budget Of $5,000,000; Activities = 20 (Equally Weighted), And A Duration = 10 Months. Let’s Assume That The Project Spending Rate Is The Same Each Month Until Completion. At Month 5 Your Personnel In The Field Are Reporting That You Are 40% Complete On The Project And
ou are looking to calculate the Earned Value for a project with a Project Plan that had a Budget of $5,000,000; Activities = 20 (equally weighted), and a Duration = 10 months.
Let’s assume that the project spending rate is the same each month until completion. At month 5 your personnel in the field are reporting that you are 40% complete on the project and you’ve spent $3,000,000. What does your Earned Value Management look like?
In other words, calculate the Earned Value Analysis, Variance Analysis, and Trend Analysis for this project and discuss these values.
Earned Value Management (EVM) is a well-known project management technique for project scope, time, and cost management.
Earned Value Management (EVM) is used to compare the project's planned budget with the actual budget spent at a certain point in time. It is a technique that includes evaluating the performance of a project using three key performance indicators.
Planned Value (PV), Earned Value (EV), and Actual Cost (AC). EVM can help project managers predict potential project performance concerns and prevent budget and schedule overruns. As per the given question, let's calculate the EV, Variance Analysis, and Trend Analysis for this project.
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Determine the downward column load that can be supported by a square single pile installed in a soil with the properties given: Friction angle, ¢ = 25 ° ,Unit weight, Y = 17 kN/m3, Undrained cohesion, Cu = 85 kN/m2. The pile size is 0.36m x 0.36m, the pile length is 18.0 m and the allowable factor of safety is 2.5.
The downward column load that can be supported by a square single pile installed in soil with the given properties is explained below: Given, Friction angle, ¢ = 25 °, Unit weight, Y = 17 kN/m3, Undrained cohesion, Cu = 85 kN/m2.
$$q_{b}=q_{p} . N_{c}$$Where, $q_p$ = Ultimate point resistance, $N_c$ = Bearing capacity factor.2. Skin friction capacity of pile:$$q_{s}=f_{s} . A_{s}$$
Where, $f_s$ = Average unit skin friction along the pile length, $A_s$ =
Surface area of pile.3. The net ultimate bearing capacity of a single pile:$$q_{u}=q_{b}+q_{s}$$4.
The net allowable bearing capacity of a single pile:$$q_{allow}=\frac{q_{u}}{F_{s}}$$Where, $F_s$ = Factor of safety.
5. The net allowable axial load:$$P_{allow}=q_{allow} A_{pile}$$.
Where, $A_{pile}$ = Cross-sectional area of pile.$$A_{pile}=0.36 m\times 0.36 m=0.1296 m^{2}$$$$N_{c}=\frac{9}{4} \cdot \frac{tan
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ABComms Ltd are planning to have their Head Quarters offices built in Newcastle Business Park.
The works will comprise a three-storey building containing offices and an attached two-storey building containing a café on the ground floor and a double-height restaurant above. The buildings are fully glazed on the south and east to give views over the River Tyne.
At this stage the design of the buildings has not been completed.
In establishing the contract procurement strategy, the client set down three main criteria:
Completion on Programme: an overall property strategy for the Newcastle area involving both disposal and termination of leases dictated key dates for project completion.
Cost Certainty: once approved, the project budget had to be regarded as a deliverable.
Maintenance of Quality Standards: the buildings have to be designed around a corporate statement and working strategy developed by ABComms Ltd.
ABComms has requested your Multidisciplinary Consulting practice to provide contract procurement advice on this project.
Review the commonly used forms of procurement/construction contracts and assess their suitability against the required criteria.
Any assumptions you may make should be documented and justified in the report.
Introduction In this report, we are going to provide contract procurement advice on the project that AB Comms Ltd has requested from our multidisciplinary consulting practice. We will review the commonly used forms of procurement/construction contracts and assess their suitability against the required criteria.
Suitable Forms of Procurement The following are some of the commonly used forms of procurement that are suitable for this project: Traditional ProcuremetTraditional procurement is suitable for this project because it allows the client to appoint a contractor who is responsible for constructing the building. This procurement method is best suited for complex projects where the design is completed before the construction begins. In traditional procurement, the contractor takes full responsibility for the construction process from start to finish.
Design and build procurement involves the contractor being responsible for both the design and construction of the building. This procurement method allows for the completion on program because the contractor is responsible for ensuring that the project is completed on time and within budget. It also provides cost certainty because the cost is agreed upon before the construction begins, and it allows for the maintenance of quality standards because the contractor is responsible for the design and construction of the building.
This procurement method allows for the completion on program because the construction manager is responsible for ensuring that the project is completed on time and within budget. It also allows for the maintenance of quality standards because the client has greater control over the design and construction process.
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Calculate the critical load for a strut which is made of a bar circular in section and 7 meter long and which is pin jointed at both the ends. The same bar when freely supported gives a mid-span deflection of 10mm under a load of 120kN at the centre.
A strut refers to a member that is slender and often subjected to compressive forces. a bar that is circular in section and 7 meters long is under consideration. The critical load for the strut, which is made of a bar circular in section and 7 meters long and which is pin jointed at both the ends, is 1239.4 N.
The strut is pin jointed at both ends, and the same bar, when freely supported, undergoes a mid-span deflection of 10mm under a load of 120kN at the center.
Therefore,[tex]I = (π/4) D⁴[/tex]
[tex](π² EI)/(L² ) = Pcr(π² x ( π/4) x (0.5)⁴ x E)/(7²) = 120kN[/tex]
The slenderness ratio, λ, is given by[tex]:L / r = λ[/tex]Here, r denotes the radius of gyration. It can be calculated using the following formula:
[tex]r² = I / A[/tex]where, A denotes the area of the cross-section.
Substituting the values:r² =[tex]I / Ar² = (π/4) (0.5)⁴ / (π/4) = (0.5)⁴r = 0.158 meters[/tex]
[tex]L / r = λ7 / 0.158 = λλ = 44.3[/tex]
Since λ is greater than the critical value of 40 for pin-ended struts, Euler’s formula is applicable in this case.
[tex](π² EI)/(L² ) = Pcr(π² x ( π/4) x (0.5)⁴ x 2 x 10⁵ N/mm²)/(7²) = PcrPcr = 1239.4 N[/tex]
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Consider the design of a biological wastewater treatment plant (WWTP) for a community with a population of 50,000 for primary and secondary treatment. The raw sewage contains an average of 150 mg/L BOD, and 100 mg/L of suspended solids (SS).
(a) Determine flow rate (Qo, estimated by the population). (1 pts) (b) Determine the SS and BODs concentrations in the primary sedimentation effluent flow, and determine the mass of primary sludge (kg) produced every day. Calculate the volume of primary sedimentation tank (3 pts)
Determining flow rate (Qo, estimated by the population):We are given that the community has a population of 50,000 people. In order to determine flow rate Qo, we will use the following formula;
[tex]Qo = Q x P[/tex]
Therefore, the estimated flow rate Qo is 10,000 m3/day.
Determining the SS and BODs concentrations in the primary sedimentation effluent flow, and the mass of primary sludge produced every day. We are given that the raw sewage has an average of 150 mg/L BOD and 100 mg/L of suspended solids (SS).
SS concentration in effluent =[tex]0.70 x 100 mg/L = 70 mg/LBOD[/tex]
concentration in effluent = 0.40 x 150 mg/L = 60 mg/L
The mass of primary sludge produced every day can be calculated using the following formula;
Mass of sludge = flow rate x SS concentration x sludge yield
Sludge yield is the fraction of total suspended solids removed by primary sedimentation and is typically 0.35-0.45.
We will assume sludge yield to be 0.4.Mass of sludge = [tex]10,000 m3/day x 100 mg/L x 0.4 = 400 kg/day[/tex]
Volume of tank = [tex]Qo x HRT x 1.25[/tex] We will assume HRT to be 2.5 hours.
Volume of tank = [tex]10,000 m3/day x (2.5 hours x 3600 s/hour)/3600 s x 1.25 = 31,250 m3[/tex]
Therefore, the volume of the primary sedimentation tank required is [tex]31,250 m3[/tex].
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The main reinforcement of a reinforced concrete slab consists of 10mm bars at 100mm spacing. If it is required to replace the 10mm bars by 12mm bars, then the spacing of the 12mm bars should be a) 120 mm b) 140 mm c) 154 mm d) 160 mm
Given that the main reinforcement of a reinforced concrete slab consists of 10mm bars at 100mm spacing. We are to determine what should be the spacing of the 12mm bars when it is required to replace the 10mm bars by 12mm bars.
Concept: We know that the strength of reinforced concrete depends upon the proportion of cement, sand, coarse aggregate and water and the degree of compaction. However, the strength of concrete also depends upon the bond between concrete and reinforcement. The bond depends upon the diameter of the bar and spacing between bars.
To determine the spacing of the 12mm bars when 10mm bars are replaced by 12mm bars, we must apply the spacing factor as per the formula given below; As the diameter of the bar is increasing from 10mm to 12mm, hence the spacing will increase. We need to find out what should be the new spacing of 12mm bars.
Let's consider the following formula to determine the spacing of the bars in the slab when it is reinforced with steel bars therefore, the spacing of 12mm bars should be approximately 144 mm. Hence, option (b) 140 mm is the closest possible answer.
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Capitalized cost is an application of perpetuity. It is the sum of the first cost and the present worth of all future payments and replacements. A machine costs P300,000 new, and must be replaced at the end of each 15 years. If the annual maintenance required is P5,000, find the capitalized cost, if money is worth 5% and the salvage value is P50,000. First Cost Present worth of the annual maintenance cost *Letters only Perpetuity of the depreciation cost Capitalized cost a. 178,700 b. 231,700 c. 321,500 d. 400.500 e. 127,700 a. 372,700 b. 441,700 c. 529,500 d. 609.500 e. 631,700
Capitalized cost is the total present value of an asset's cost, which includes its acquisition price as well as all future expenses and/or revenue over its lifetime. In this question, we are given that a machine costs P300,000 new and must be replaced every 15 years, with an annual maintenance cost of P5,000.
The salvage value is P50,000, and the money is worth 5%. We must calculate the capitalized cost. The formula to find the capitalized cost is:
Capitalized cost = First cost + Present worth of the annual maintenance cost + Perpetuity of the depreciation cost - Salvage value
First cost = P300,000
Present worth of the annual maintenance cost = A(P/F, 5%, 15) x 5,000
= 4.0468 x 5,000
= P20,234
Perpetuity of the depreciation cost = D(P/A, 5%, 15) x (P300,000 - P50,000)
= 9.449 x 250,000
= P2,362,227.34
Salvage value = P50,000
Capitalized cost = P300,000 + P20,234 + P2,362,227.34 - P50,000
= P2,632,461.34
Therefore, the capitalized cost is P2,632,461.34. The closest option to this answer is e. 2,632,700.
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Hydraulic: If all headloss may be ignored and there is a flow in a rectangular channel with boundless length, constant flow rate, and gradient, then how would the flow look like at the downstream end of the channel? Steady uniform flow or Nonuniform flow?
When there is a flow in a rectangular channel with an infinite length, constant flow rate, and gradient, while headloss can be ignored, the flow will be uniform and steady at the downstream end of the channel. In hydraulics, a uniform flow refers to a situation where the flow characteristics remain constant along the flow direction.
On the other hand, non-uniform flow refers to a situation where the flow characteristics vary along the flow direction. In this context, since headloss is negligible, the rectangular channel will experience a uniform flow that is steady and uniform throughout the channel.
This is because there are no changes in elevation, width, or other parameters along the channel that can lead to changes in the flow characteristics such as flow velocity, discharge, and depth. Furthermore, since the length of the rectangular channel is infinite, it ensures that the flow remains uniform.
Finally, it is essential to note that while head loss may be negligible, it is still a critical parameter that influences the flow characteristics in a channel. Head loss is a reduction in hydraulic pressure due to friction, turbulence, or other factors, and ignoring it may not give accurate results, especially for practical hydraulic applications that involve real-life scenarios.
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A 76 mm x 76mm x 6mm angular section is welded to a gusset plate having a thickness of 8mm as shown in the figure. The length L1 equals 125mm and L2 is 65mm. The angular section has a cross sectional area of 929mm2, Fy=248 MPa, Fu=400MPa.
Determine the value of the tensile force P based on gross area in kN.
Determine the value of tensile force P based on block shear in gusset plate along the weld in kN.
Determine the value of tensile force P (kN) based on net area if the value of shear lag factor is 0.85.
Given data: Length of the angular section L1= 125mmLength of the gusset plate L2 = 65mmThickness of the gusset plate = 8mmCross-sectional area of angular section A = 929 mm²Fy = 248 MPaFu = 400 MPa Method 1: Tensile force P based on gross area in kNWe need to determine the tensile force P based on gross area.
Gross area is the total cross-sectional area of the member, ignoring any holes or openings. The formula for tensile force based on gross area is:P = Ag × σ_p Where,Ag is the gross area of the memberσ_p is the allowable stress in tension.Ag = Cross-sectional area of the angular section= 929 mm²The allowable tensile stress can be calculated using:
Fy = 248 MPaσ_p = 0.6 × Fyσ_p = 0.6 × 248σ_p = 148.8 MPa Therefore, the tensile force based on gross area is:P = Ag × σ_pP = 929 × 10⁻⁶ × 148.8P = 0.138 kN Method 2: Tensile force P based on block shear in gusset plate along the weld in kN Block shear is a limit state that combines tensile and shear stress. It happens along a line of fasteners that is perpendicular to the direction of the load.
Agv = (L2 - t) × twAgv = (65 - 8) × 6Agv = 357 mm²σ_pv = 0.4 × Fuσ_pv = 0.4 × 400σ_pv = 160 MPaAtn = Ag - n_h × t_h × tAtn = 929 - 2 × 8 × 6Atn = 893 mm²σ_t = 0.6 × Fyσ_t = 0.6 × 248σ_t = 148.8 MPaP = min(Agv × σ_pv, Atn × σ_t)P = min(357 × 10⁻⁶ × 160, 893 × 10⁻⁶ × 148.8)P = 0.148 kN
Method 3: Tensile force P based on net area and shear lag factor 0.85The formula for tensile force based on the net area is:P = An × σ_pWhere,An is the net area of the member σ_p is the allowable stress in tension.An = Ag - (n_h - 1) × t_h × twAn = 929 - (2 - 1) × 8 × 6An = 893 mm²σ_p = 0.6 × Fyσ_p = 0.6 × 248σ_p = 148.8
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Your "visual lead time" on the highway should be about 15 seconds.
Visual lead time on the highway is important as it helps a driver avoid collisions and makes safe driving possible. A visual lead time of 15 seconds is usually recommended for highway driving. This means that you should be able to see about 15 seconds ahead of your current position while driving.
A visual lead time of 15 seconds allows you to have enough time to react to any potential hazards or changes in traffic flow. This lead time can vary depending on road conditions, speed, and weather. If you are driving at high speed or in poor weather conditions such as heavy rain or fog, your visual lead time should be longer than 15 seconds to ensure safety.
In addition to visual lead time, it's also important to maintain a safe distance between your vehicle and the vehicle in front of you. The general rule of thumb is to stay at least one car length behind for every 10 mph you are driving. This means if you are driving at 60 mph, you should maintain a distance of at least six car lengths from the vehicle in front of you.
In conclusion, maintaining a visual lead time of 15 seconds while driving on the highway and maintaining a safe distance between your vehicle and other vehicles is crucial for safe driving.
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Given a cantilever beam of length "L". The left support "A" is fixed while the right end "B" is free. With constant EI. A counter-clockwise moment "M" is applied at "B". Using Double Integration Method, what will be the value of differentiation of deflection in y direction (y’) with respect to distance "x" from point A?
a) 0
b) 1/EI (Mx + C1)
c) -1/EI (Mx + C1)
d) 1/EI (Mx^2 + C1x + C2)
e) -1/EI (Mx^2 + C1x + C2)
Given a cantilever beam of length "L". The left support "A" is fixed while the right end "B" is free. With constant EI. A counter-clockwise moment "M" is applied at "B". Using Double Integration Method, the value of differentiation of deflection in y direction (y’) with respect to distance "x" from point A can be calculated as follows:
We have the following equation for deflection (y) of a cantilever beam with a point load at the end:y = (Mx^2)/2EIWhere; M = counter-clockwise moment applied at point “B”.EI = flexural rigidity of the beam. x = distance from point A.
Defining constants of integration (C1 and C2) for each case, we can differentiate y in terms of x, to get the slope of the deflection curve (y’):y’ = (dy/dx) = Mx/EI + C1.
From the above equation, we can see that the value of differentiation of deflection in y direction (y’) with respect to distance "x" from point A is:1/EI (Mx + C1).Therefore, the correct option is (b) 1/EI (Mx + C1).
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