In the feedback pair amplifier (Darlington) of the following figure assume that there is
a resistor (parasitic) between the collector of Q1 and the base of Q2 of 10 Ohms. Find the corresponding formula for IB1 (similar to eq. 4.69). Find the base and collector currents of each transistor, and the base, emitter, and collector voltages of each transistor. Assume that both transistor have been built of silicon. Try to avoid useless approximations.
Answers
Explanation:
gkltuijhfryij etikklhggj
Related Questions
why are metamorphic rocks formed by contact metamorphism
Answers
Metamorphic rocks are formed by contact metamorphism when rocks are heated by the intrusion of hot magma or lava into the surrounding rock. This heating causes the minerals in the rocks to recrystallize and change into new minerals, forming metamorphic rocks.
What is contact metamorphism?
Contact metamorphism is a type of metamorphism that occurs when rocks are heated by the intrusion of hot magma or lava into the surrounding rock. The heat causes the minerals in the rocks to recrystallize and change into new minerals, forming metamorphic rocks.
The change in the rock is generally limited to a zone of contact, or aureole, surrounding the intrusion, and the degree of metamorphism decreases with distance from the intrusion. The temperature and pressure conditions that cause this change vary depending on the type of rock and the proximity to the intrusion.
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overhead branch-circuit conductors, where the voltage does not exceed 150 volts to ground, nominal, shall have a minimum overhead clearance of ? when crossing over a sidewalk.
Answers
Overhead branch-circuit conductors, where the voltage does not exceed 150 volts to ground, nominal, shall have a minimum overhead clearance of 10 ft (3.0m) when crossing over a sidewalk.
What is circuit conductor?A substance or material that permits electricity to flow through it is known as a conductor or electrical conductor. When voltage is applied, the electrical charge carriers—typically electrons or ions—in a conductor move effortlessly from atom to atom. The majority of metals, such as copper, are thought to be good conductors, whereas nonmetals, or insulators, are thought to be poor conductors.
The ability of a substance to transmit heat or electricity is referred to as conductivity in general. A conductor is able to move electrons through it with little to no resistance, allowing electricity to flow through it. Ordinarily, good electrical conductors include metals, metal alloys, electrolytes, even some nonmetals like graphite and liquids like water. Among the best electrical conductors is pure elemental silver.
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Imagine that you are interviewing job applicants to work in database design for the ford motor company. you ask an applicant about a database project he or she completed for a university course and he or she tells you that the several of the relations in the project were in third but not second normal form. assuming that this is the only thing you know about the applicant would you recommend that ford hire this applicant? why or why not?
Answers
Call Interface for Oracle Custom apps can be made thanks to OCI's native C/C++ interfaces for interfacing with the Oracle Database. Again, more powerful physical machines with higher
What components comprise databases?A databases is a group of data that has been organized to make it simple to update and manage. Data records or files including data such as a invoice number, client information, bank records, and product information are commonly collected and stored in computer databases.
What are examples and databases?A collection is a purposeful gathering of data. They enable the digital manipulation and archiving of data. Databases make managing data easier. Take a look at a store as an.
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Edit the program provided so that it receives a series of numbers from the user and allows the user to press the enter key to indicate that he or she is finished providing inputs. After the user presses the enter key, the program should print: 1 # Edit the 2. 3 theSum = 0. 4 data inpu 5 while data 6 number 7 theSum 8 data = 9 print("The 1. The sum of the numbers 2. The average of the numbers An example of the program input and output is shown below: Enter a number or press Enter to a uit: 1 Enter a number or press Enter to a uit: 2 Enter a number or press Enter to 4 uit: 3 Enter a number or press Enter to a uit: The sun is 6.0 The average is 2.0 2 1. The sum of the numbers 2. The average of the numbers 3 theSum = 4 data i 5 while da 6 numb thes 8 data 9 print("T 7 An example of the program input and output is shown below: Enter a number or press Enter to 4 uit: 1 Enter a number or press Enter to a uit: 2 Enter a number or press Enter to a uit: 3 Enter a number or press Enter to a uit: The sum is 6.0 The average is 2.0 Grading sum.py + ers umbers 1 # Edit the code below 2 3 theSum = 0.0 4 data = input("Enter a number: ") 5 while data != ": 6 number = float(data) 7 theSum += number 8 data = input("Enter the next number: ") 9 print("The sum is", theSum) -am input ow: Es Enter to a ss Enter to a ess Enter to a ess Enter to a mpleted your Submit button to 22
Answers
Change the given program so that it accepts a string of numbers from the user and enables the user to press the enter key to signal the completion of inputs.
count = 0, data = input, and theSum = 0. ("Enter a number or press Enter ro quit: ") number = float while data!="" (data) Number count plus one plus theSum equals input ("Enter a number or press Enter ro quit: ") print() print("The sum is",theSum) ("The sum is",theSum) print(theSum/count, "The average is",
Enter a number or press Enter to quit: 1
Enter a number or press Enter to quit: 2
Enter a number or press Enter to quit: 3
Enter a number or press Enter to quit:
The sum is 6.0
The average is 2.0
Like an integer and a floating point unit, a string is a form of data used in programming, although it represents text rather than numbers. It consists of a string of characters that may also include spaces and numerals. An illustration of a string is the word "hamburger" and the sentence "I ate 3 hamburgers." If provided properly, even "12345" could be regarded as a string. A string must typically be enclosed in quotation marks for the data to be recognized as a string and not a number or variable name.
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Explain 5 consequences of using wrong tool for winding
Answers
Answer:
1. Poor Productivity
2. Hazardous Job Sites
3. Wasted Money
4. Inability to Scale
5. Damaged Professional Reputation.
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Engineering and work practice controls have evolved primarily: a. To teach the hierarchy and application of preventive strategies. b. To enforce compliance by housekeeping and maintenance departments. c. To comply with federal law. d. For control of exposure to bloodborne and airborne pathogens
Answers
Option D: To reduce exposure to bloodborne and airborne infections, engineering and work practice safeguards have primarily emerged.
Engineering is the scientific application of how best to transform natural resources for human benefit. In the United States, the Engineers Council for Professional Development defines the field as the innovative application of "scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all with respect to an intended function, econometric analysis, or other measurable operational parameters. The manufacture or assembly of engines, machine tools, and machine parts is sometimes a more ambiguous definition of engineering, particularly in Great Britain.
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You can expect a control system within a building to turn mechanical devices on and off and to adjust
A. the output of mechanical devices.
B. the level of noise.
C. the primary source of power.
D. settings when devices fail.
Answers
You can expect a control system within a building to turn mechanical devices on and off and to adjust the primary source of power. Thus, the correct option for this question is C.
What are Mechanical devices?Mechanical devices may be characterized as those devices or instruments that have parts that move when it is working, often using power from an engine or from electricity.
HVAC control systems are used to control the operations of heating, ventilation, and air conditioning equipment. An example of a control device is a thermostat. By lowering the thermostat, we control the functions of the air conditioner unit.
Therefore, you can expect a control system within a building to turn mechanical devices on and off and to adjust the primary source of power. Thus, the correct option for this question is C.
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The major effects due to settlement are as given below.
• Cracks in interior walls and foundation,
• Non-uniform setting of doors and windows,
• The bulging of walls and sinking of slabs and chimneys,
• Stair step cracks and
• Unevenness in floor, etc.
Answers
Civil engineers have been challenged by cracks in both unreinforced and reinforced concrete for the past 60 years.
This thesis makes an effort to comprehend the many forms of cracks that can form in concrete and to quantify the crack width when such information is provided about their origin. The case studies that are discussed in this paper help to sustain our understanding of the various forms of cracks. Concrete cracks are incredibly widespread and challenging to comprehend. He immediately assumes there is a problem whenever there is a crack in the wall or slab, especially if the concrete is relatively recent. The opposite is not always true. Certain kinds of fissures are unavoidable. The best a contractor can hope for is to keep the cracking under control.
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which type of rock is most likely to contain fossils? igneous, sedimentary, or metamorphic?
Answers
The correct response is b. sedimentary. Igneous rock, metamorphic rock, and sedimentary rock are the three basic categories of rock. Sedimentary rock preserves almost all fossils.
Sedimentary rocks are a class of rock created by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. The mechanisms that lead to these particles settling in one location are collectively known as sedimentation. Sediment is the collective name for the tiny pieces that make up sedimentary rocks. It can be made up of biological or geological waste, such as minerals (organic matter). The formation of the geological debris resulted from the weathering and erosion of pre-existing rocks or from the solidification of molten lava blobs that volcanoes had released. Water, wind, ice, or mass movement, together known as agents of denudation, convey the geological debris to the site of deposition. The bodies and pieces of dead aquatic species suspended in water and slowly accumulating on the bottom of water bodies, primarily their shells and feces, are known as biological detritus (marine snow). Sedimentation can also happen when dissolved minerals precipitate out of water.
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A 20-cm-radius ball is uniformly charged to 54 nC.
A) How much charge is enclosed by spheres of radii 5, 10, and 20 cm?
B) What is the electric field strength at points 5, 10, and 20 cm from the center?
Answers
The spheres with radii of 5, 10, and 20 cm contain 1.1 nC, 8.875 nC, and 54 nC amount of charge, respectively.
What amount will you be charged?The current flow and the amount of time it is poured determine how much charge passes a point in either an electric circuit. The amount charged is denoted by the letter Q and is expressed in coulombs (C).
Is the charge the current?The rate at which positive charge flows is called current. The movement of electrons, ions, as well as other particles can produce current. Since electrons have a negative charge, they move in the reverse direction from current.
charge density is,
ρ = q/V
q = magnitude of charge
V = volume of sphere
= (4/3)πr³
Radius; r = 20 cm
= 0.2 m
q = 54 nC
= 54 × 10⁹ C
At r = 5cm = 0.05 m
V = (4/3) × π × 0.05³
V = 0.0005236 m³
q = 2.1188 × 10^(-6) × 0.0005236
q = 1.1 × 10^(-9) C
= 1.1 nC
q = 2.1188 × 10⁻⁶ × 0.0041888
q = 8.875 × 10⁻⁹
= 8.875 nC
At r = 20 cm,
q = 54 nC
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A proce for the production of 1,3-butadiene reult from catalytic dehydrogenation at atmopheric preure of 1-butene according to the reaction:
C4H8(g) → C4H6(g)H2(g)
To uppre ide reaction, the 1-butene feed tream i diluted with team in the ratio of 10 mole of team per mole of 1-butene. The reaction i carried out iothermally at 525°C, and at thi temperature 33% of the 1-butene i converted to 1,3-butadiene. How much heat i tranferred to the reactor per mole of entering 1-butene?
Answers
The balanced equation for the reaction is
C4H8(g) + 3H2(g) → C4H6(g) + 3H2(g)
The enthalpy change for the reaction can be calculated using the standard enthalpies of formation for 1-butene and 1,3-butadiene.
The heat transferred to the reactor per mole of entering 1-butene can be calculated by multiplying the enthalpy change for the reaction with the conversion of 1-butene to 1,3-butadiene (33%).
As the enthalpy change of the reaction is not provided, it is not possible to calculate the heat transferred to the reactor per mole of entering 1-butene.
how does the parthenon reflect balance and order in its architecture?
Answers
The right description of the Parthenon is that it is based on a rectangle and features lofty columns leading to a gently sloping roof.
The Parthenon was built as a magnificent marble temple between 447 and 432 B.C., at the height of the ancient Greek Empire. The Acropolis of Athens, a group of connected temples, is home to the Parthenon, a temple dedicated to the goddess Athena. It was the largest and most lavish temple ever constructed on the Greek mainland. The Parthenon has been put through a lot over the years, including earthquakes, fires, conflicts, explosions, and looting. Despite this devastation, however, the Parthenon continues to serve as a compelling reminder of ancient Greece and Athenian civilization. One of the most famous buildings in the world and a constant reminder of ancient Greece, it is still in use today. When did the Parthenon fall?
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5. Derive an expression for the total extension of the tapered bar of circular cross-section shown in Fig. 1.21 when it is subjected to an axial tensile load P. 1₂ W. 4₁ dx D
Answers
Young's modulus of the bar is E. Hint: consider the slice of diameter dfx) and infinitesimal thickness dx with cross-section P d D A(x) x)4, compute its extension, and integrate the result with respect to x over the length of the bar L.
What is cross-section?Cross section means the representation of the intersection of an object by a plane along its axis. A cross-section is a shape that is yielded from a solid (eg. cone, cylinder, sphere) when cut by a plane.For example, a cylinder-shaped object is cut by a plane parallel to its base; then the resultant cross-section will be a circle. So, there has been an intersection of the object. It is not necessary that the object has to be three-dimensional shape; instead, this concept is also applied for two-dimensional shapes.Also, you will see some real-life examples of cross-sections such as a tree after it has been cut, which shows a ring shape. If we cut a cubical box by a plane parallel to its base, then we obtain a square.To learn more about parallel refer to:
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Write a program that will input a list of test scores in from the keyboard. When the user enters -1, print the average. What do you need to be careful about when using -1 to stop a loop
Answers
A program that allows keyboard entry of a collection of test results. When the user types -1, the average is printed as 72.5.
What is a program, exactly?A program, often known as source code, is a group of instructions that tell the hardware of a computer how to do a task. As an example, users can create and compose documents using the word processor Microsoft Office applications.
Using the program: Why?Because of how automatic today's world is, machine learning is crucial. Humans must be in charge of the relationship between people and technologies. Due to the accuracy and efficiency with which computers and other machines can carry out tasks, humans are able to harness this power through the use of programming languages.
print("Enter the Scores:")
total = []
while True:
num = int(input())
if num == -1:
break
total. append(num)
print("The average is:",(sum(total)/len(total)))
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The probability that Jay parks in a no-parking zone and gets a parking ticket is 0.06,
and the probability that Jay cannot find a legal parking space and has to park in the noparking zone is 0.20. On Tuesday, Jay arrives at school, find the probability that he will
get a parking ticket given that he has to park in a no-parking zone.
Answers
The probability that he will get a parking ticket given that he has to park in a no-parking zone is 0.3.
How to calculate the probability?The Probability simply means the chance that a particular thing or event will happen. It is the occurence of likely events. It is simply the area of mathematics that deals with the numerical estimates of the chance that an event will occur or that a particular statement is true.
In this case, the probability of an event us usually represented as a number between 0 and 1. In this case, 0 denotes the impossibility of the event and 1 represents certainty.
The probability that Jay parks in a no-parking zone and gets a parking ticket is 0.06,
and the probability that Jay cannot find a legal parking space and has to park in the noparking zone is 0.20.
The probability that he will get a parking ticket given that he has to park in a no-parking zone will be:
= 0.06 / 0.20
= 0.3
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In the circuit shown below, a load having an impedance of 39 + j26 Ω is fed from a voltage source through a line having an impedance of 1 + j4 Ω. The effective, or rms, value of the source voltage is 250 V.
• Calculate the load current IL and load voltage VL.
• Calculate the average and reactive power delivered to the load.
• Calculate the average and reactive power delivered to the line.
• Calculate the average and reactive power supplied by the source
Answers
The circuit is a voltage divider with impedances ZL = 39 + j26 Ω and ZT = 1 + j4 Ω.
1- To calculate the load current IL, we can use the voltage divider equation: IL = VL / ZL = VS / (ZL + ZT)
2- To calculate the load voltage VL, we can use the voltage divider equation: VL = IL * ZL
3- To calculate the average power delivered to the load, we can use the formula: Pl = VL * IL * cos(Φ) where Φ is the phase angle between the voltage and current.
4- To calculate the reactive power delivered to the load, we can use the formula: QL = VL * IL * sin(Φ)
5- To calculate the average power delivered to the line, we can use the formula: Pl = VL * IL * cos(Φ)
6- To calculate the reactive power delivered to the line, we can use the formula: QL = VL * IL * sin(Φ)
7- To calculate the average power supplied by the source, we can use the formula: Ps = VS * IL * cos(Φ)
8- To calculate the reactive power supplied by the source, we can use the formula: Qs = VS * IL * sin(Φ)
Note that to calculate the above values, you need to know the values of VS, ZL, and ZT, as well as the phase angle Φ.
compare iron to steel. which is more desirable? why? what process helps to make large amount of it? what things could inventors and builders do because they had cheap, large-scale access to it?
Answers
The systems that are larger are those that are for the more crucial things. like video games and specialized software.
A computer has how many components?A motherboards, a central processor unit, a graphic processing unit random access memory and a hard disk or sturdy drive are the five fundamental components of every computer. Every computer has 5 components, whether it is a high-end gaming system or a simple desktop system for kids.
Describe a computer?A cpu is a piece of electronic equipment used to manipulate data or information. Data can be stored, retrieved, and processed by it. You may already be aware of the fact you are able to use a pc to surf the Internet, send emails, type documents, and play games.
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Data Mining is designed to detect patterns in data or to detect when an instance of data does NOT follow the regular pattern. What do we call the process to identify when data does not follow a regular pattern?
Select one:
a. Anomaly Detection
b. Principle Components Analysis
c. Logistical Regression
d. Clustering
Answers
The correct response is a. Anomaly Detection. Data mining's anomaly detection process, also known as outlier analysis, seeks out data points, occasions, and/or observations that differ from a dataset's typical pattern of activity.
The identification of uncommon items, events, or observations that significantly deviate from the majority of the data and do not conform to a well-defined notion of normal behaviour is generally understood to be the purpose of anomaly detection (also known as outlier detection and occasionally as novelty detection). These examples might raise questions about the validity of the data set or raise concerns that they were produced by a different mechanism than the rest of the data. Numerous fields, such as cyber security, health, machine vision, statistics, neuroscience, law enforcement, and financial fraud are just a few that use anomaly detection. To help with statistical analysis, such as computing the mean or standard deviation, anomalies were initially looked for in the data that were clearly rejected or omitted. They were also eliminated in order to improve predictions from models like linear regression, and more recently, their elimination improved the effectiveness of machine learning algorithms. However, anomalies themselves are often of interest and the observations that the user is most interested in finding in the whole data set. These observations must be distinguished from noise or unimportant outliers in order to be of interest.
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Feature engineering identifies and mines specific attributes and variables of a data set to facilitate which types of data analytics?
Predictive and advanced analytics.
Prescriptive and descriptive analytics.
Descriptive and predictive analytics.
Prescriptive and advanced analytics.
Answers
Feature engineering identifies and mines specific attributes and variables of a data set to facilitate; Predictive and advanced analytics.
Feature engineering is the process of identifying and mining specific attributes and variables of a data set to facilitate various types of data analytics. The goal of feature engineering is to identify the most important and relevant information in the data and to extract and transform it into a format that can be used for predictive and advanced analytics.
Predictive analytics is a type of data analysis that uses statistical algorithms and machine learning techniques to predict future outcomes based on historical data. Predictive analytics can be used for a wide range of applications, such as forecasting sales, identifying potential fraud, or predicting customer churn. Feature engineering can help to identify the most relevant variables and attributes in the data that can be used to train predictive models and make accurate predictions.
Advanced analytics is a broader term that encompasses a variety of techniques, such as machine learning, artificial intelligence, and deep learning. These techniques can be used for a wide range of applications, such as image recognition, natural language processing, and anomaly detection. Feature engineering can also be useful in advanced analytics, as it can help to identify the most important variables and attributes in the data that can be used to train advanced models and make accurate predictions.
On the other hand, prescriptive analytics and descriptive analytics, don't rely on feature engineering as much as predictive and advanced analytics do. Prescriptive analytics is a type of data analysis that uses mathematical algorithms, optimization, and simulation to generate recommendations and make decisions. Descriptive analytics is a type of data analysis that is used to summarize and describe the characteristics of a data set. In both cases, the data is mostly used as it is, without the need of extensive feature engineering.
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The figure shows two possible paths for
negotiating an unbanked turn on a
horizontal portion of a race course. Path
− follows the centerline of the road
and has a radius of curvature #= 85 ,
while path − uses the width of the
road to good advantage in increasing the
radius of curvature to $= 200 . If the
drivers limit their speeds in their curves
so that the lateral acceleration does not
exceed 0.8, determine the maximum
speed for each path.
Answers
Answer:
beautiful day here in a little bit to get used to
Explanation:
If hgjukeuc you a call when we are all
A simple electric circuit consisting of a resistor, a capacitor, and an inductor is depicted in Fig. P2.11. The charge on the capacitor q(t) as a function of time can be computed as
Answers
The correct response is B) L=20mH C=100F R=50V (314t) V 0 =10,
=314 X L
An inductive and a capacitive element are required in any resonant circuit, whether it is in series or parallel. Due to the source's internal resistance (Rs), the inductor's internal resistance (Rl), and any additional resistance used to modify the response curve's shape, a resistive element is always present (Rdesign).
=wL=3142010 3
=6.28, X C = C 1
=31.8,
Z = R 2 +(X C X L)
2
Power loss =56.1
P= 2 Z 2
V \s0 \s2 \s \s R \s \s
=0.79W
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Write a function in Java that implements the following logic: Given three ints, a, b, and c, return true if b is greater than a, and c is greater than b. However, with the exception that if bok is true, does not need to be greater than a
Answers
This function takes in three ints, a, b, and c, and uses the Math.abs() method to calculate the absolute value of the difference between each pair of ints (a and b, a and c, b and c).
What is java function?The function that takes in three ints, a, b, and c, and uses the Math.abs() method to calculate the absolute value of the difference between each pair of ints (a and b, a and c, b and c).
The function then compares the absolute value of each difference to 10 and returns true if one of them is greater or equal than 10. If none of the differences are greater than or equal to 10, the function returns false.
Therefore, This function takes in three ints, a, b, and c, and uses the Math.abs() method to calculate the absolute value of the difference between each pair of ints (a and b, a and c, b and c).
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which of the following descriptions apply to standard-type motorcycles? a. are best for long-distance touring b. a lot of performance-oriented bodywork c. straight-up seating position d. designed solely for off-highway use
Answers
The correct response is c. straight-up seating position. Standard-type motorcycles apply to straight-up seating position.
Keeping the feet flat while seated or placing them on the ground or a footrest. Do not cross your ankles or knees. keeping a modest distance between the chair and the back of the knees. putting the knees at the same height as the hips or just a little lower. Sit upright with your shoulders back and your back straight. When sitting, try to leave two inches between the back of your knees and the edge of the seat. Puleio advises adjusting your seat so that your thighs are parallel to the floor and your feet are flat on the ground (or on a footrest if your feet cannot rest comfortably).
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what is a geometric parameter that, as a structural engineer, we can modify to reduce the bending stress for a given moment? explain your answer.
Answers
These transversal loads will result in a base shear V and a tension force M that both induce normal stress and shear stress, respectively.
What makes it a moment?It can seem like to use the term "a brief duration" in addition to referring to physical motion because the word minute appears to have Latin roots that signify movement, change, or alteration.
What unit of time is a moment?Units of due to the force distance are used to express the moment's size. The normal English measures for a momentary are feet pounds, but the standard unit units for moment magnitude are newton meters.
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The difference between the setpoint temperature and the conditioned temperature is known as
A. margin.
B. offset.
C. gap.
D. error.
Answers
Answer:offset
Explanation:
air enters the compressor of a regenerative gas turbine cycle, at 310 k and 100 kpa, and is compressed to 900 kpa and 650 k. the regenerator has an efficiency of 80%, and air enters the turbine at 1,400 k. for a turbine efficiency of 90%, determine:
Answers
(a) The regenerator's rate of heat transfer is [tex]h_{1}=310.24\frac{kj}{kg}[/tex].
(b) The thermal efficiency. Assume variable specific heats for air is [tex]h_{2}=659.84\frac{kj}{kg}[/tex].
An internal combustion engine, steam turbine, steam engine, boiler, furnace, refrigerator, air conditioner, etc. all consume thermal energy, and the thermal efficiency is a dimensionless performance measure of such a device. Thermal efficiency, sometimes referred to as the coefficient of performance, is the proportion of the net heat generated (for heating) or the net heat removal (for cooling) to the energy input in a heat engine or heat pump, respectively (external work). While a heat pump's coefficient of performance (COP) is more than 1, a heat engine's efficiency is fractional since its output is always less than its input. The Carnot theorem places additional limitations on these numbers.
The enthalpy and relative pressure at state 3 are determined with data from A-17 for the given temperature:
[tex]h_{3}=1515.42\frac{kj}{kg} \\Pr_{3}=450.5[/tex]
The pressure ratio and the relative pressure at state 3 and state 4 are used to calculate the relative pressure at state 4:
[tex]Pr_{4}=\frac{Pr_{3}}{r_{p}}\\=\frac{450.5}{\frac{900}{100}}\\=50.06[/tex]
With the aid of interpolation and data from A-17, the isentropic enthalpy at state 4 is calculated from this value:
[tex]h_{4s}=832.46\frac{kj}{kg}[/tex]
The enthalpies at states 1 and 2 are determined from A-17 for the given temperatures:
[tex]h_{4}=h_{3}-n_{T}(h_{3}-h_{4s})\\=(1515.42-0.9(1515.42-832.46))\frac{kj}{kg}\\[/tex]
The actual enthalpy at state 4 is determined from the isentropic turbine efficiency relation:
[tex]h_{1}=310.24\frac{kj}{kg}h_{2}=659.84\frac{kj}{kg}[/tex]
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Air enters the compressor of a regenerative gas-turbine engine at 310 K and 100 kPa, where it is compressed to 900 kPa and 650 K. The regenerator has an effectiveness of 80 percent, and the air enters the turbine at 1400 K. For a turbine efficiency of 90 percent, determine (a) the amount of heat transfer in the regenerator and (b) the thermal efficiency. Assume variable specific heats for air.
The power transmitted by a shaft is 300 kW at 450 rpm. The maximum torque is 25% more than mean torque. The permissible shear stress for the shaft material is 42 N/mm². The twist in the shaft should not exceed 1.5° per meter length. Determine the diameter required, if a) the solid shaft b) the shaft is hollow with internal diameter is 0.5 times external diameter.
Answers
T = (300 kW) / (2π x 450 rpm) = 8.2 Nm
The maximum torque is 25% more than the mean torque, so the maximum torque is:
Tmax = 1.25 x 8.2 Nm = 10.25 Nm
The maximum shear stress in the shaft is given by:
τmax = (Tmax) / (π x d^3 / 32)
where d is the diameter of the shaft.
Solving for d, we get:
d = (32 x Tmax) / (π x τmax)
d = (32 x 10.25 Nm) / (π x 42 N/mm²)
d = 28.3 mm
The twist in the shaft should not exceed 1.5° per meter length. The twist in the shaft is given by:
θ = (32 x Tmax x L) / (π x d^4)
where L is the length of the shaft.
For the given conditions, the maximum length of the shaft is:
Lmax = (π x d^4 x 1.5°) / (32 x Tmax)
Lmax = (π x (28.3 mm)^4 x 1.5°) / (32 x 10.25 Nm)
Lmax = 0.9 m
What is an adaptive hot start
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Answer: Automatically increases the output amperage at the start of a stick weld, should the start require it. Helps eliminate sticking of the electrode at arc start.
Explanation:
Please help me solve the assignment
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In this instance, interleaving refers to the system performing a single physical memory access while utilising more than one memory bank.
What is memory bank?For storing and retrieving frequently used data, a memory bank is a logical storage area within computer memory. For quick access to and retrieval of programs and common data, it may be a component of regular RAM or the cache memory. Bank switching is a mechanism that sets up the memory that the CPU can access at any given time. Since the MOS 6510 CPU can only access 216 = 65536 memory addresses ($0000-$FFFF), banks of memory can be switched (which makes them visible or invisible to the CPU) to increase total capacity. The data memory address bus is 12 bits, and it can address up to 4 MB of memory. Each bank in the RAM has 256 bytes and there are 16 of them overall.To learn more memory bank refer to:
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the open-hearth process of making steel select one: a. was replaced by the bessemer process. b. was first done in the united states. c. produced small quantities of high-grade steel. d. made the production of large-dimension pieces possible. e. was ridiculed by established steelmakers such as abram hewitt.
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The Bessemer process was a low-cost method for mass producing steel before the open-hearth furnace was invented. Henry Bessemer, an English inventor, created the procedure.
What are the highlights of Bessemer Venture Partners?Bessemer Venture Partners assists business owners in creating solid foundations for enduring enterprises. Bessemer supports CEOs and founders at every step of growth with more than 135 IPOs & 200 portfolio businesses in the enterprise, consumer, and healthcare sectors.
Who is Bessemer's owner?James S. Janney III, Henry Phipps' great-grandson, took over as president of the board business directors in 1994 after Ogden Mills Phipps retired. The top seven stories at 1271 Avenida of Americas were leased by Bessemer Trust in 2018.
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