Answer:
Direct Control Electrode Negative) (DCEN)
Explanation:
The type of current that flows from the electrode across the arc to the work is called direct current electrode is called DCEN.
Both copper and stainless steel are being considered as a wall material for a liquid cooled rocket nozzle. The cooled exterior of the wall is maintained at 150°C, while the combustion gases within the nozzle are at 2750°C. The gas side heat transfer coefficient is known to be hᵢ = 2×10⁴ W/m²-K, and the radius of the nozzle is much larger than the wall thickness. Thermal limitations dictate that the temperature of copper must not exceed 540°C, while that of the steel must not exceed 980°C. If the nozzle is constructed with the maximum wall thickness, which material would be preferred? For Cu, ρ = 8933 kg/m³, k = 378 W/m-K and for stainless steel, ρ = 7900 kg/m³, k = 23.2 W/m-K
a. The maximum thickness of the copper nozzle is 0.33 cm
b. The maximum thickness of the steel nozzle is 0.054 cm
c. The material preferred is steel
The is a heat transfer question
What is heat transfer?Heat transfer is the movement of thermal energy from one body to the other.
How do we calculate the maximum wall thickness?We know that the rate of heat loss by the gas equals rate of heat gain by the metal.
The rate of heat loss by gasThe rate of heat loss by gas is P₁ = -hA(T₂ - T₁) where
h = The heat transfer coefficient of gas = 2 × 10⁴ W/m²-K,A = The surface area of nozzle,T₂ = The maximum temperature of metal and T₁ = The temperature of gas = 2750°CThe rate of heat gain by metalThe rate of heat gain by metal is P₂ = kA(T₂ - T₃)/d where
k = The hermal coefficient of metal,A = The surface area of nozzle,T₂ = The maximum temperature of metal,T₃ = The temperature of exterior wall of nozzle = 150°C and d = thickness of nozzle.The maximum thickness of nozzle.Given that P₁ = P₂, we can write
-hA(T - T') = kA(T - T")/d
So we make d subject of the formula, thus
t = -k(T₂ - T₃)/h(T₂ - T₁)
a. Maximum thickness for copper nozzleWe know that for copper
T₂ = 540°C andk = 378 W/m-KSubstituting the values of the variables into d, we have
d = -k(T₂ - T₃)/h(T₂ - T₁)
d = -378 W/m-K(540°C - 150°C)/[2 × 10⁴ W/m²-K(540°C - 2750°C)]
d = -378 W/m-K(390°C)/[2 × 10⁴ W/m²-K(-2210°C)]
d = -147420 W/m/-4420 × 10⁴ W/m²
d = 147420 W/m/44200000 W/m²
d = 0.0033 m
d = 0.33 cm
So, the maximum thickness of the copper nozzle is 0.33 cm
b. Maximum thickness for steel nozzleWe know that for steel
T₂ = 980°C andk = 23.2 W/m-KSubstituting the values of the variables into d, we have
d = -k(T₂ - T₃)/h(T₂ - T₁)
d = -23.2 W/m-K(980°C - 150°C)/[2 × 10⁴ W/m²-K(980°C - 2750°C)]
d = -23.2 W/m-K(830°C)/[2 × 10⁴ W/m²-K(-1770°C)]
d = -19256 W/m/-3540 × 10⁴ W/m²
d = 19256 W/m/35400000 W/m²
d = 0.00054 m
d = 0.054 cm
So, the maximum thickness of the steel nozzle is 0.054 cm
c. Which material is preferred?Since the steel nozzle has a thickness of 0.054 cm while the copper nozzle has a thickness of 0.33 cm, we see that the thickness of the steel nozzle is less. So, the steel is preffered.
So, the material preferred is steel
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Military glorification through mosaics, relief carvings and triumphant arches are often associated with?
Military glorification through mosaics, relief carvings and triumphant arches are often associated with roman architectural monument and is the correct choice.
What is a Monument?This can be defined as a structure which is usually large and is used to commemorate the history of an influential person. This helps to serve as an example and also a reminder as to why the performance of good deeds are important
The use of military glorification through mosaics, relief carvings and triumphant arches were also often used by the Romans in other to commemorate war victories and the succession of a new ruler which is known as the emperor.
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Having an adequate ___________ provides a driver with the time and space necessary to react to potential and immediate hazards in the driving scene.
Answer:
Space Cushion
Explanation:
Having an adequate Space Cushion provides a driver with the time and space necessary to react to potential and immediate hazards in the driving scene.
During shielded metal arc welding, a welder can receive a burn comparable to sunburn if proper protective clothing is not worn.
a. true
b. false
Answer:
A. True
Explanation:
The statement is true
A primary current of 6.0 A exists in an ideal iron-core transformer at a primary voltage of 100 volts. If the current in the secondary is 0.75 A, calculate the output voltage.
Answer:
Explanation:
Formula
Voltage_p * Current_p = Voltage_s * Current_s
Comment
What the formula means is the voltage multiplied by the current in the primary = voltage multiplied by the current in the secondary.
Givens
Vp =100 v
Ip = 6 amps
Vs = x
Is = 0.75 amps
Solution
100 * 6 = 0.75* x
600 = 0.75 x Divide both sides by 0.75
600/0,75 = 0.75x/0.75
800v = x
What you have here is a step up transformer. It has a relatively small voltage (100 volts ) on the primary which the transformer changes to 800 volts in the secondary.
Answer
800 volts.
A smaw station includes the arc welding machine, ____, electrode lead, workpiece lead, booth, workbench, stool, and ventilation.
Answer:
Electrode Holder
Explanation:
Shielded metal arc welding (SMAW), also known as manual metal arc welding, is a manual arc welding process that uses a consumable and protected electrode. As the electrode melts, a cover that protects the electrode melts and protects the weld area from oxygen and other atmospheric gases
1. A 100kVA, 5000/200V transformer is tested. The data is provided below. (100 pts) Open Circuit VOC=200V, IOC=5A, POC=120W Short Circuit VSC=80V, ISC=10A, PSC=400W (a) What is the high-voltage side equivalent circuit? (30 pts)
Answer:open circuit
short circuit
voc
Explanation:
a) Your friend is faced with a situation i n whi ch t here is a difficulty in
choosi ng bet ween what he/she is being asked t o do and what is consistent
wit h appropriate ethi cal behavi or. Such a situati on calls for critical thi nking
in deci di ng about what shoul d be t he proper course of acti on. Wit h concrete
exa mpl es, exa mi ne any four steps he/she needs t o go through i n order to
make t he ri ght et hical decisions.
The Steps my friend need to make an ethical decision are:
Step One: He or she needs to define the Problem. Step Two: He or she needs to find out possible Resources to solve the problem and then Brainstorm on the List for the Potential Solutions to the problem.Step Three : Evaluate and examine those Alternatives. ...Step Four : Make his or her Decision, Implement It and then examine your Decision.What is ethical decision model?An ethical decision-making model is known to be a kind of a tool that can be used by a person to help create the ability to think in regards to an ethical dilemma and come to an ethical decision.
Note that Ethical decision-making is one that is dependent on the key character values such as trustworthiness, respect, role, fairness, and others.
Therefore, The Steps my friend need to make an ethical decision are:
Step One: He or she needs to define the Problem. Step Two: He or she needs to find out possible Resources to solve the problem and then Brainstorm on the List for the Potential Solutions to the problem.Step Three : Evaluate and examine those Alternatives. ...Step Four : Make his or her Decision, Implement It and then examine your Decision.Learn more about ethical decision from
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When a one piece parallel joint driveline arrangement with 2 universal joints is used which of its angles must be equal and opposite
If a one piece parallel joint driveline arrangement with 2 universal joints is used the working angles of its two U- joints of its angles must be equal and opposite.
What is truck driveline?The truck driveline is known to be a form of a a less-known and it is one that is known to be a vital aspect of the engine where or which is seen in heavy-duty diesel trucks.
Note that It's a system is made up of all the gears and axles needed to make sure that a truck can move more faster and efficiently.
Hence, If a one piece parallel joint driveline arrangement with 2 universal joints is used the working angles of its two U- joints of its angles must be equal and opposite.
See full question below
When a one-piece, parallel-joint driveline arrangement with 2 universal joints is used,which of its angles must be equal and opposite?
A) working angles of its two U- joints
B) angles of both mating yokes
C) angle of the transmission output shaft and the axle pinion shaft
D) all of the above
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When measuring the resistance of an electrical load, connect the meter ____ the load.
Answer:
multimeter
Explanation: in parallel
In a combination circuit, current can flow in part of a parallel circuit while another part of the circuit is turned off. true false
Answer:
no false
Explanation: all bench are ame current.
The diameter of a cylinder was measured 2 times and the following data values were obtained 10.14 mm 10.16 mm .The diameter with its uncertainty is :
Answer: D
Explanation: did it on edge
Two techniques that allow the io to play a useful advisory role even without direct experience in human subject protection areas are:_____.
The two techniques that allow the io to play a useful advisory role even without direct experience in human subject protection areas are periodically reviewing institutional policy and reviewing federal regulatory agency determination letters.
What is advisory?It should be noted that the role of an advisory board is to provide current knowledge, critical thinking as well as to increase the confidence of the decision-makers that represent the company.
Also, human subjects protections implies the collective term for the federal, state, and university ethical considerations which protect the rights and welfare of human beings.
Therefore, the two techniques that allow the io to play a useful advisory role even without direct experience in human subject protection areas are periodically reviewing institutional policy and reviewing federal regulatory agency determination letters.
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Question 2: (a) In your own words, clearly distinguish and differentiate between Ethics in Engineering and Ethics in Computing ( 9 Marks) (b) Draw a table of comparison to illustrate your answer in (a) and provide in each case five practical examples in the fields outlined above.
Engineering ethics is not without abstraction, but in contrast with computing, it is animated by a robust and active movement concerned with the seamless identification of ethics with practice.
What is engineering?This is a branch of science and technology concerned with the design, building, and use of engines, machines, and structures that uses scientific principles.
Comparing ethics in engineering and ethics in computing:
Engineering ethics are a set of rules and guidelines. While computing ethics deals with procedures, values and practices.In engineering ethics, engineers must adhere to these rules as a moral obligation to their profession While in computing ethics, the ethics govern the process of consuming computer technology.Following these ethics for the two professions will NOT cause damage, but disobeying them causes damage.Some practical examples in the computing field:
Avoid using the computer to harm other people such as creating a bomb or destroying other people's work.Users also should not use a computer for stealing activities like breaking into a bank or company.Make sure a copy of the software had been paid for by the users before it is used.Some practical examples in the engineering field:
Integrity for oneself.Respect for one another.Pursuit of excellence and accountability.Hence, Engineering ethics is the field of system of moral principles that apply to the practice of engineering and following them is important to the profession.
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What is the name of this piece?
Answer: block o’ metal
Explanation:
In an ungrounded electrical systems with conductors installed in grounded metal raceways and enclosures, what is the voltage from the current carrying conductors to the metal raceways and why?
In the ungrounded electrical circuits or systems, the circuit is one that is not or do not have the connection to the grounding electrode.
What is an ungrounded electrical system?An ungrounded system is known to be defined as a system that is known to be one that do not have an intentional connection to ground, and it has an exception of possibly going through potential indication or other kinds of devices.
Note that The neutral of an ungrounded system is one that is seen to be under reasonably balanced load conditions and thus it is one that is usually near to ground potential.
Hence, In the ungrounded electrical circuits or systems, the circuit is one that is not or do not have the connection to the grounding electrode.
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Dampness or moisture introduces ____ into the weld, which causes cracking when some metals are welded.
Answer: Dampness or moisture introduces hydrogen into the weld, which causes cracking when some metals are welded.
Explanation:
This moisture (hydrogen) is a major cause of weld cracking and porosity.
A flux used for welding, brazing, or soldering prevents the formation of, dissolves, or helps remove?
Answer:
Helps to remove Oxides formed during brazing.
Explanation:
Flux is needed to dissolve and remove oxides that may form during brazing. Prevent or inhibit the formation of oxide during the brazing process
Exam Lesson Name: The Trades of Plumbing and Pipet
Exam number: 286115RR
Exam Guidelines
Exam Instructions
Question 4 of 20:
Select the best answer for the question.
4. Before starting construction work on a building, you should apply for which of the following?
OA. A contractor's license
OB. A permit
OC. A bond
OD. An inspector's approval
Mark for review (Will be highlighted on the review page)
Answer: ………………..
Explanation:???????????????
A tensile-reinforced t beam is to be designed to carry a uniformly distributed load on a 20-ftsimple span. The total moment to be carried is mu-5780 in-kips. Concrete dimensions, governed by web shear and clearance requirements, are b 20 in, b 10 in, he-5in, and d 20 in. Iffy 60 ksi and fe-4ksi, what tensile reinforcement is required at midspan? select appropriate reinforcement to provide this area of steel and check concrete cover limitations, assuming no. 3 stirrups. What total depth h is required? sketch your design.
The tensile reinforcement is required at midspan is 3.103 in^2 and the total depth h is required is 17 in.
organizing the information given in the statement:
t beam is to be designed to carry a uniformly distributed load on a 20-ftsimple spanThe total moment to be carried is mu-5780shear and clearance requirements, are b 20 in, b 10 in, he-5in, and d 20 in. Iffy 60 ksi and fe-4ksiWith that infromation we can say, total moment to be caried out in the bean is:
M=5780 in kips
Characteristics strength of concreete is 4ksi
Characteristics strength of steel is 60ksi
Find the depht of stress block:
[tex]a=\frac{A_s*f_y}{0.85*fc}[/tex]
Substitute 4ksi in fc, 60 ksi in fy we have:
[tex]a= 17.65 A_s[/tex]
Find the area of tensile reinforcement:
[tex]\phi M= \phi A_sf_y(d-a/2)\\5780=A_s*60(20-17.65A_s/2)\\A_s=3.103 in^2[/tex]
Provide 3 stirrups of 9 inches bar (wich has a diameter of 1.128 inches)
Provide 3 inch as cover fot T-beam, therefore the effective depth is:
h=20-3=17 in
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Question1:
You are contracted to install MS Exchange Server software on all PCs of a company. After doing half of the work, you found that the company did not pay MS for the copies you are installing. You notified the company that they were out of compliance with MS licensing requirement, but got no response.
(a) What do you do?.
(b) What other information would you need?.
(c) Explain.
Since you have notified the company that they were out of compliance with MS licensing requirement, the next thing to do is to look or ask for the product key that is with the company
The other information would you need is for the company to obtain the product license by buying the product key.
Do you need a license for Microsoft?If you get to buy any of the standard Microsoft Office or other packages that is said to be the Home and Student edition, a person or firm will need a license.
Note that the license is one that guarantee one the use of the product and its installation.
Therefore You need to purchase a lot of copies of it and as such, Since you have notified the company that they were out of compliance with MS licensing requirement, the next thing to do is to look or ask for the product key that is with the company
The other information would you need is for the company to obtain the product license by buying the product key.
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The weave bead width should be ____ the diameter of the electrode being used. The same as no wider than 2–3 times 4 times no wider than 6 times
Answer:
the answer to this is 6 times.
Each of the gears a and b has a mass of 675 g and has a radius of gyration of 40 mm, while gear c has a mass of 3. 6 kg and a radius of gyration of 100 mm. Assume that kinetic friction in the bearings of gears a, b, and c produces couples of constant magnitude 0. 15 n·m, 0. 15 n·m, and 0. 3 n·m, respectively. Knowing that the initial angular velocity of gear c is 2000 rpm, determine the time required for the system to come to rest.
The time required for this system to come to rest is equal to 9.87 seconds.
Given the following data:
Mass of gear A = 675 g to kg = 0.675 kg.Radius of gear A = 40 mm to m = 0.04 m.Mass of gear C = 3.6 kg.Radius of gear C = 100 mm to m = 0.1 m.How to determine the time required?In order to calculate the time required for this system to come to rest, we would have to determine the moment of inertia for gears A and C.
Mathematically, the moment of inertia for a gear can be calculated by using this formula:
I = mr²
Where:
m is the mass.r is the radius.For gear A, we have:
I = mr²
I = 0.675 × 0.04²
I = 0.675 × 0.0016
I = 1.08 × 10⁻³ kg·m².
For gear C, we have:
I = mr²
I = 3.6 × 0.1²
I = 3.6 × 0.01
I = 0.036 kg·m².
Next, we would convert the initial angular velocity of gear C in revolution per minutes (rpm) to radian per seconds (rad/s) as follows:
ωc₁ = 2000 × 2π/60
ωc₁ = 4000π/60
ωc₁ = 209.44 rad/s.
Also, the initial angular velocity of gears A and B is given by:
ωA₁ = ωB₁ = rc/rA × (ωc₁)
ωA₁ = ωB₁ = 0.15/0.06 × (209.44)
ωA₁ = ωB₁ = 2.5 × (209.44)
ωA₁ = ωB₁ = 523.60 rad/s.
Taking the moment about A, we have:
I_A·ωA₁ + rA∫F_{AC}dt - M(f)_A·t = 0
Substituting the given parameters into the formula, we have;
(1.08 × 10⁻³)·(523.60) + 0.06∫F_{AC}dt - 0.15t = 0
0.15t - 0.06∫F_{AC}dt = 0.56549 ......equation 1.
Similarly, the moment about B is given by:
0.15t - 0.06∫F_{BC}dt = 0.56549 ......equation 2.
Note: Let x = ∫F_{BC}dt + ∫F_{AC}dt
Adding eqn. 1 & eqn. 2, we have:
0.3t - 0.06x = (0.56549) × 2
0.3t - 0.06x = 1.13098 ......equation 3.
Taking the moment about A, we have:
Ic·ωc₁ - rC∫F_{AC}dt - rC∫F_{BC}dt - Mc(f)_A·t = 0
0.036(209.44) - 0.3t - 0.15(∫F_{BC}dt + ∫F_{AC}dt) = 0
0.3t + 0.15x = 7.5398 ......equation 4.
Solving eqn. 3 and eqn. 4 simultaneously, we have:
x = 30.5 Ns.
Time, t = 9.87 seconds.
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Technician A says that some manufacturers recommend against breaking the cylinder glaze with a glaze breaker when re-ringing an engine that has not been removed from the car. Technician B says that a Flex-Hone is used to help break the cylinder glaze so new rings can seat more easily. Who is right
Both Technician A that says that some manufacturers recommend against breaking the cylinder glaze with a glaze breaker and Tech B that says Flex-Hone is used to help break the cylinder glaze are right.
What is the reason behind deglazing a cylinder?
Deglazing can be regarded as the techniques that is been used on the surface of an engine cylinder which is been roughened to create friction between the moving parts .
Doing this will now give room for engine oil to grip the sides of the cylinder, hence Both Technician A that says that some manufacturers recommend against breaking the cylinder glaze with a glaze breaker and Tech B that says Flex-Hone is used to help break the cylinder glaze are right.
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If welding is being done in the vertical position, the torch should have a travel angle of?
Answer:
Between 35°– 45°
Explanation:
In the vertical position, Point the flame in the direction of travel. Keep the flame tip at the correct height above the base metal. An angle of 35°–45° should be maintained between the torch tip and the base metal. This angle may be varied up or down to heat or cool the weld pool if it is too narrow or too wide
A regulator diaphragm is often made from ____. reinforced rubber malleable iron tempered aluminum stainless steel
Answer:
Stainless Steel.
Explanation:
A regulator diaphragm is often made from stainless steel.
A 500 kva load has a power factor of 90% lagging and is supplied by a 480 v source. Determine the three line currents
Answer:
pf=kw/kvar
Explanation: voltage p=vi
The torque developed by the motor in N-m and lb-ft
Explanation:
HP to torque (Nm) Calculation:
Torque T(Nm) in Newton meter (Nm) is equal to the 746 times of power P(HP) in horsepower divided by the 0.105 times of the motor speed N(rpm) in RPM. In another short word, 7127 times of horsepower divided by the motor speed is equal to motor torque.
Invent five new communication method wired or wireless you think would be practical
The five type of new communication method (both wire and wireless) are:
Social MediaSMS Text MessagingEmail MarketingDirect EmailVoice CallingWhat is a communication?This means the act of giving, receiving and sharing of information as well as talking, writing, listening or reading.
The types of Communication includes:
Verbal Communication: It occurs when we engage in speaking with others.Non-Verbal Communication: It occurs when what we speak often says more than the actual words.Written Communication: It occurs in an actual text or writing.Listening: It occurs when we pay attention to a speaker.The wired communication involves transmission of data over a wire-based communication technology while a wireless communication involves transmission of data without the use of a cable or wire.
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A microscope illuminator uses a transformer to step down the 120 V AC of the wall outlet to power a 12.0 V,50 W microscope bulb. What is the resistance of the bulb filament
Answer:2.88 ohms
Explanation:
R= V^2 / P
12^2/50
144/50
2.88 ohms
