A 5-hp, 230V, single-phase motor's branch-circuit short-circuit protection (dual-element fuse) cannot be greater than 50A. A 25-hp, 460V, 3-phase synchronous motor's branch-circuit short-circuit protection (inverse-time breaker) must be greater than 70A.
What size branch circuit overcurrent protection is required for a motor?For a single motor utilized in a continuous duty application, under 430.22, the motor branch-circuit conductors must have an ampacity of at least 125 percent of the motor full-load current rating.
What is the motor branch's maximum rating?This gadget can withstand a maximum rating of 60A. It must be size down to 60A so as not to exceed the calculated 61A. The discussion of single motor computations and the Code is now complete.
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ipcc not incorporating the impact of climate change on hazards such as heat waves and flooding will potentially significantly underestimate the risks presented by these hazards
The most important thing humans can do to assist nature in battling climate change is to safeguard the world's natural environments, which hold billions of tons of this "living carbon."
However, the conclusion is that regional climate changes, particularly temperature rises, are having an impact on natural systems all over the world, and that these temperature increases are very likely caused by anthropogenic emissions of greenhouse gases. By the end of this century, extreme sea level occurrences that formerly happened once every 100 years could occur annually. The loss of seasonal snow cover, glacier and ice sheet melting, and summer Arctic Sea ice will all be accelerated by further warming.
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determine the 0.2% offset yield strength from the stress-strain data. the sample is cylindrical with a radius of 1.25 mm.
By building a parallel line offset from the linear stress-strain line by 0.002 strain, the 0.2% offset yield strength is computed.
Because the yield strength of steel, according to ASTM, is 0.2% permanent strain (offset). This definition serves as a good "rule of thumb" for the majority of steels and typically equates to a 0.5% total strain. The predetermined amount of permanent strain is set along the strain axis of the graph, to the right of the origin, in order to determine yield strength. Figure 5 designates it as Point. Point (D) is crossed by a straight line that has the same slope as the first part of the stress-strain curve.
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Which statement about the filtering result of the following ACL is true?
Router(config-ext-nacl)# permit tcp 192.168.1.0 0.0.0.255 host 192.168.100.1 eq 80
Router(config-ext-nacl)# deny tcp any host 192.168.100.1 eq 80
If you want to prevent traffic from entering the internal server network, use the command ip access-list 6 deny 192.168.1.00.0.0.255.
How does the router's ACL filter work?A set of rules known as a "Access Control List" (ACL) governs how any traffic passing through routers is allowed, permitted, or denied. By filtering and managing the traffic flow between routers, it functions at layer 3 to ensure security.According to the source IP address, destination IP address, and port numbers, packet filtering occurs in the Extended access list. Services will either be allowed or blocked according to an extended access list. From 100 to 199, and 2000 to 2699, are the extended ACL ranges that are produced.If you want to prevent traffic from entering the internal server network, use the command ip access-list 6 deny 192.168.1.00.0.0.255.To learn more about "Access Control List" (ACL) refer to:
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Cognitive computing, which is also called _____ computing, aims to mimic the functioning of the human brain through greater interconnectivity among memory, processors, and communications.
a. hybrid memory
b. core
c. neurosynaptic
d. quantum
Answer: c
Cognitive computing, which is also called neurosynaptic computing, aims to mimic the functioning of the human brain through greater interconnectivity among memory, processors, and communications.
A cognitive chip or neurosynaptic chip is a type of computer processor that works more like a biological brain than a normal CPU.
Neurosynaptic chips are designed to operate like human brains on the hardware level, in contrast to cognitive computing and neural networks, which use software to simulate human thought and learning. Even if a normal computer is effective at processing language, mathematics, and data analytics, it can be labor-intensive for it to carry out tasks that even rudimentary biological brains are proficient at. These processes, which include pattern recognition, sensory processing, and learning, are more effectively performed by a neurosynaptic device. The neurosynaptic chip has the potential to change capabilities, particularly in mobile technologies where computation and power are constrained.
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what type of truss is constructed of wood or metal and is generally used to support flat roofs and floor assemblies?
The parallel chord truss is constructed of wood or metal and is generally used to support flat roofs and floor assemblies.
What is The parallel chord truss?In contrast to the majority of other timber frame trusses, a parallel chord truss is not triangular in shape. They are rectangular in shape, with intermediate components known as webs strengthening and separating the top and bottom chords (the long, straight truss parts).Although they are commonly employed as floor joists, parallel chord trusses with diagonal bracing can also be used as rafters in sloped roofs.Most frequently waterproof, felt or underlayment is also sometimes referred to as tar paper. It is sprayed on top of the decking to provide an additional layer of protection from the outdoors and water underneath the shingles.To learn more about floor joists refer to:
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a 220-v-rms, 60 hz, 3-phase y-connected induction motor draws 31.87 a at a power factor of 75% lagging. for all three phases, the total stator copper losses are 400 w, and the total copper losses are 150 w. the rotational losses are 500 w
It is possible to change the slip and speed at which the maximum torque occurs if the rotor resistance is raised in some way.
In the case of slip ring or wound rotor type motors, this can be accomplished by adding external resistance to the rotor circuit. This occurs when the rotor conductors are shorted-circuited and there is a transformer action between the stator winding and the rotor winding. The rotor experiences a strong current flow as a result. The starting torque is also impacted if the applied starting voltage is decreased in order to reduce this high starting current.
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technician a says that a transaxle first-gear ratio of 3.5:1 means input torque is increased by 3.5 times. technician b says that a transaxle first-gear ratio of 3.5:1 means input speed is increased by 3.5 times. which technician is correct?
The technician A is right. When the transaxle's first gear is 3.5:1, the input torque is multiplied by 3.5. The output torque is thus 3.5 times greater than the input torque. The first-gear ratio of the transaxle has no impact on the input speed.
What is a torque?
The force that can force an object to spin along an axis is measured as torque. In linear kinematics, force is what drives an object's acceleration. Similar to this, an angular acceleration is brought on by torque. As a result, torque can be thought of as the rotational counterpart to force.
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high traffic volume allows more vehicles on the expressway due to the design of a) speed limits b) medians c) exits d) multiple lane roads
Answer:
d) multiple lane roads
Explanation:
High traffic volume allows more vehicles on the expressway due to the design of multiple lane roads. The correct option is d.
What is an expressway?Expressways are split, high-speed thoroughfares for through traffic with partially or completely restricted access.
Roadways that connect significant cities, villages, and other locations are referred to as highways, and they often feature four lanes to accommodate high-speed traffic.
However, an expressway is a high-speed route with limited access that has a number of infrastructure such access ramps and lane separators.
The term "highway" derives from elevated Roman highways that featured a mound or hill in the middle created by earth thrown from side ditches.
Because multiple lane highways are designed for high traffic volumes, there can be more vehicles on the expressway.
Thus, the correct option is d.
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It's the law. Under New York law, you can get a citation for riding your bike while listening to music using headphones or earbuds in both ears. It is lawful, however, to listen to music with only one earbud keeping the other ear free.
Sensory deprivation. One of the main ways that people alert each other to danger on the road is through sound. Whether it's honking, yelling or ringing a bicycle bell, you're less likely to hear any of these warnings if you're listening to music putting you at higher risk of an accident.
Decreased attention. The more stimuli you have to contend with, the more difficult it is to dedicate your full attention to one particular task. If you get caught up in a song or story you're listening to while cycling, it can increase your distractibility which could have disastrous consequences.
The majority of cycling-related accidents involve a cyclist and a motor vehicle. Not surprisingly, the injuries a cyclist suffers in such collisions tend to be disproportionately serious and often fatal. Therefore, if you're cycling in traffic, foregoing the headphones can prove to be a life-saving decision.
Answer:s
Explanation:s
It's the law. Under New York law, you can get a citation for riding your bike while listening to music using headphones or earbuds in both ears. It is lawful, however, to listen to music with only one earbud keeping the other ear free.
Sensory deprivation. One of the main ways that people alert each other to danger on the road is through sound. Whether it's honking, yelling or ringing a bicycle bell, you're less likely to hear any of these warnings if you're listening to music putting you at higher risk of an accident.
Decreased attention. The more stimuli you have to contend with, the more difficult it is to dedicate your full attention to one particular task. If you get caught up in a song or story you're listening to while cycling, it can increase your distractibility which could have disastrous consequences.
The majority of cycling-related accidents involve a cyclist and a motor vehicle. Not surprisingly, the injuries a cyclist suffers in such collisions tend to be disproportionately serious and often fatal. Therefore, if you're cycling in traffic, foregoing the headphones can prove to be a life-saving decision.
The following tabulated data were gathered from a series of Charpy impact tests on a tempered 4340 steel alloy. Temperature (°C) 0 25 50 75 100 113 125 150 175 200 Impact Energy (J) 105 104 103 97 63 40 34 28 25 24 (a) Plot the data as impact energy versus temperature. (Hint: use engineering paper for the graph) (b) Determine a ductile-to-brittle transition temperature as the temperature corresponding to the average of the maximum and minimum impact energies. (c) Determine a ductile-to-brittle transition temperature as the temperature at which the impact energy is 50J
To establish the temperature at which the transition from ductile to brittle occurs as being 80J. Another answer is 65 J.
To calculate the transition temperature from deductile to brittle that corresponds to the average of the maximum and least impact energy.
Standard = 124J + 6J / 2 = 65J
According to this criterion, the ductile-to-brittle transition temperature is approximately -105°C, as seen on the plot by the single set of dashed lines.
to establish the temperature at which the transition from ductile to brittle occurs as being 80J.
Additionally, the ductile-to-brittle transition temperature for an impact energy of 80 J is approximately -95°C, as shown on the plot by the other set of dashed lines.
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Which of the following is shared among threads? Select all that apply. file descriptors registers stack memory virtual address space
Every thread have its own stack, register, and PC, so only address space that is shared by all thread for a single process.
Why threads are important?The use of threads has a number of advantages. A thread is more effective. For a new thread, the operating system does not need to construct a new memory map (as it does for a process). In order to monitor the status of open files and increase reference counts on open file descriptors, it is not necessary to allocate new structures.Additionally, threading makes some programming styles simple. Although it is true that shared memory among threads increases the risk of problems, shared memory also makes it simple to communicate data among threads. All threads in a process can read from and write to the same global and static variables.To learn more about thread, refer to
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technician a says that viscosity index improvers thicken oil when it becomes hot and thins it when it becomes cold. technician b says that viscosity index improvers thin oil when it's hot and thicken it when it's cold. who is correct?
Technician a is correct that he says Oil is thickened by viscosity index improvers when it is hot and thinned when it is cold.
The viscosity index (VI) is an arbitrary, unitless measurement of how much a fluid's viscosity changes as a function of temperature. It is mostly used to describe the behavior of lubricating lubricants' viscosity-temperature relationship. The more the viscosity is impacted by temperature variations, the lower the VI. The viscosity index is a way to quantify how viscosity changes in response to temperature changes. The viscosity index, to put it simply, indicates how well a fluid can maintain its viscosity throughout temperature fluctuations. An arbitrary scale known as the viscosity index is used to assess how quickly viscosity changes as temperature rises. The rate of viscosity change as a result of temperature change is measured by a lubricant's viscosity index (VI).
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the technician connects one test lead to the chassis ground and the other to the door chime negative connection. then, the technician performs a voltage drop test on the ground side circuit to the door chime module and finds that the ground side circuit voltage has a 3v drop reading. what is the next step?
The next step of technician is to take a look at the ground wire that runs from the door chime module connector to the chassis ground.
An electrical connection between various metallic components of a machine is ensured by a chassis ground, which connects them all. A couple such examples include automobiles and electrical devices. As with lightning protection for high voltage power systems, chassis grounding provides the same function for electronics. To avoid damaging or interrupting circuit functionality, it is specifically necessary to direct undesired and potentially harmful current away from system parts and components. An electrical device's metal housing serves as the chassis ground, which is a site where ground is collected. To prevent electrical shock, a chassis ground can be utilized for grounding and shielding. Using a strong ground wire or cable, ground the engine block to the frame, ensuring sure that the connections are metal to metal, clean, and secure.
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a 220-v-rms, 60 hz, 3-phase y-connected induction motor draws 31.87 a at a power factor of 75% lagging. for all three phases, the total stator copper losses are 400 w, and the total copper losses are 150 w. the rotational losses are 500 w
If the rotor resistance is increased in any way, it is possible to alter the slip and speed at which the greatest torque occurs.
This may be done in the case of slip ring or wound rotor type motors, right?via rotor circuit's addition of external resistance. When the rotor conductors are shorted-circuit, a transformer-like effect between the stator winding and the rotor winding takes place.
As a result, a powerful current flow is felt in the rotor. If the applied beginning voltage is lowered in an effort to lower this high starting current, the starting torque is also affected.
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a heating element operates on 115 v. if it has a resistance of 15.4 ohms, what current, in amps, does it draw?
The current is 7.46A. A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or a vacuum is known as an electric current.
How to calculate current?Electric currents are streams of electrically charged particles, such as electrons or ions, moving through a conductor or a void. It is calculated as the net rate of electric charge flowing through a surface or into a control volume.Electric currents generate magnetic fields, which are used in motors, generators, inductors, and transformers. In typical conductors, they cause Joule heating, which ignites incandescent light bulbs. To transfer information via communications, time-varying currents produce electromagnetic waves.Current is obtained by merely dividing the magnitude of a charge by the measurement duration. Current can be calculated using the equation I = Q t, where I denotes current, Q denotes charge, and t denotes time.Given value
Voltage = 115v
Resistance = 15.4 ohms
Equation is Current = V / R
I = V / R
= 115V / 15.4Ω = 7.467532A
The current is 7.467532 amps
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when a given op-amp has a common-mode input of 1 v, the output of the device is 100 mv. when the device has a differential input of 2 mv, the output of the device is 10 v. what is the cmrr of the device'? 50,000,000 : 1 50,000 : 1 1000 : 1 5 : 1
The CMRR the device is 5 : 1. The CMRR can be meant as ratio between common model gain and differential model gain.
CMRR refers to the ratio of the common-mode gain with differential-mode gain. The example of CMRR happens when a differential input change of Y volts produces a change of 1 V at the output, and a common-mode change of X volts produces a similar change of 1 V, then the CMRR is X/Y.
Assume a common-mode input of 1 v, the output of the device is 100 mv is Y
Common mode gain = Vout/Vin
Common mode gain = 0.01/1 = 0.01
Differential mode gain = 1
Then,
CMRR = Common mode gain/ Differential mode gain
CMRR = 0.01/1 = 0.01
Assume when the device has a differential input of 2 mv, the output of the device is 10 v is Y
Common mode gain = Vout/Vin
Common mode gain = 10/2
Common mode gain = 5
Differential mode gain = 10/2-1 = 10
Then,
CMRR = Common mode gain/ Differential mode gain
CMRR = 5/10 = 0.5
Hence, ratio of the CMRR in device is
CMRR = 0.5/0.1 = 5 : 1
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water flows past a flat plate that is oriented parallel to the flow with an upstream velocity of 0.5 m/s. determine the approxi- mate location downstream from the leading edge where the bound- ary layer becomes turbulent. what is the boundary layer thickness at this location?
Along with a flat, smooth plate, the following variables have an impact on the thickness of the boundary layer formation: The fluid's kinematic viscosity affects the thickness of the boundary layer.
As the distance from the leading edge gets less, the boundary layer thickness gets thinner. The narrow region of flow next to a surface known as a boundary layer is the layer in which friction between the fluid and solid surface affects the flow [2]. The theory was founded on certain significant System. In some areas, the viscosity of the fluid in motion cannot be ignored. The thickness of the boundary layer at a distance from the leading edge is discovered to be 5 mm for laminar flow over a flat plate.
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(20%) machining appears to play an important role in the manufacturing of this phone housing, but machining is a relatively slow process. can you explain why machining was chosen instead of sheet-metal forming or casting alone? list the major considerations and compare among all these processes to justify your answer.
No raw material is wasted during the metal forming process, and the product has higher mechanical qualities and is produced more quickly.
By using a wedge-shaped tool, machining is the removal of material in the form of chips. Metal plates, tubes, or solid round bars make up the material that is machined. On the other hand, metal flat sheets make up the material that goes through the fabrication process. Metal is heated in a furnace until molten before being cast. The metal is poured into a die, or mold, while it is still liquid, giving the metal the shape of the component.
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how can the elevation of an intermediate turning point be calculated from the usual note format of differential levels?
By deducting the foresight rod reading from the instrument's height, the elevation is computed. The elevation reading of a site with unknown elevation is called a foresight.
How do you calculate elevation using differential leveling?If you are aware of A's elevation (E(A)), you can use the formula BS - FS + E to get B's elevation (E(B)) (A).
However, the instrument's height or the elevation of the line of sight directed from the level is determined by BS + E(A) = HI.
By deducting the foresight rod reading from the instrument's height, the elevation is computed. The elevation reading of a site with unknown elevation is called a foresight.
An intermediate location between benchmarks known as a turning point (T.P.) offers a temporary point of known elevation for a level circuit between two benchmarks that are far apart.
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the amplitude of the measurable nmr signal is reduced from 2 mvpeak-peak to 1 mvpeak- peak. how many discrete signal levels become useless when the adc has 10 bits? (use the same gain of the amplifier that is calculated in 1b).
It can detect 1,024 (2¹⁰) discrete analog levels because the Arduino's ADC is a 10-bit ADC.
The precision of a measurement is based on resolution. The accuracy of the measurement values increases with digitizer resolution. The input amplifier's vertical range is split into 256 discrete levels by a digitizer with an 8-bit ADC. The typical vertical resolution for digital oscilloscopes is 8 bits. However, a 10-bit analog-to-digital converter (ADC) has a resolution that is four times higher than an 8-bit ADC. Signal details are much clearer to see. Calculating the Effective Number of Bits (ENOB) for an Analog-to-Digital Converter (ADC) involves solving for N, substituting the measured Signal-to-Noise Ratio plus Distortion (SINAD) value into the equation describing the Signal-to-Noise Ratio (SNR) for an ideal ADC, and then multiplying the result by the number of bits in the ADC.
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a vehicle is found to have multiple oil leaks. technician a says that all of the oil leaks should be repair. technician b says the pcv system should be tested first. who is correct?
Technician b says the pcv system should be tested first is correct.
What is pcv system?Vaccine Knowledge | PCV (Pneumococcal Conjugate Vaccine). MenB vaccination (Meningococcal B Vaccine)
Poor fuel economy is one of the indications of a faulty PCV valve. The precise ratio of the air and fuel mixture, which is necessary for proper combustion, will be thrown off by a broken PCV valve.
While not all vehicles have one, the majority do. If your vehicle has one, check the PCV valve (shown in Figure 8-5) to make sure it isn't blocked with sludge from impurities in the exhaust fumes or stuck in the wide-open position if your engine has been idling unevenly or if a malfunction indicator light comes on.
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consider the loading shown. note: this is a multi-part question. once an answer is submitted, you will be unable to return to this part. identify the equation of the elastic curve for the cantilever beam ab.
I is the section's second moment of area or moment of inertia. The following techniques can be used to determine the equation for the elastic curve of a beam.
The first and second derivatives of the function that represents the curve in terms of the Cartesian coordinates x and y are dydx and d2ydx2, respectively. Assuming that the longitudinal stresses on the fibers are within the elastic limit, the elastic curve of a beam is the curve formed by the intersection of the neutral surface with the side of the beam. The Bending Moment Equation's double integral is taken in order to perform the fundamental calculation. There are formulas for both cantilever beams and beams that are simply supported.
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while examining a heavy, flat steel plate bolted to the oil pan rails and main bearing caps, technician a suggests it is used to stiffen the crankcase to reduce torsional twisting. technician b says the plate is used to prevent oil from splashing up onto the cylinder walls and causing high oil consumption. who is correct?
Technician a is correct because that he says claims that it is utilized to strengthen the crankcase in order to prevent torsional twisting.
Engine heat ultimately determines what temperature the oil reaches and is the most common cause of high oil pressure. Oil pressure can also increase due to malfunctioning engine parts. Low oil level is the most frequent and simplest to fix reason for low pressure. While regular oil changes are important, it's also crucial to regularly check your motor oil level and top it off as needed in between oil changes. A beam will twist when a torque is applied, and this is known as torsional twisting. It is applied methodically to screws, nuts, axles, drive shafts, etc., and is also produced more randomly under service conditions in car bodies, boats, airplane fuselages, bridges, springs, and many other structures and components.
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Briefly explain how each of the following influences the tensile modulus of a semicrystalline polymer and why: (a) molecular weight (b) degree of crystallinity (c) deformation by drawing (d) annealing of an undeformed material (e) annealing of a drawn material
The molecular weight Increases, degree of crystallinity Decreases, deformation by drawing Increases, annealing of an undeformed material Increases, annealing of a drawn material Increases.
Molecular Weight: As the polymer's molecular weight rises, it does as well. Degree of crystallinity: As the degree of crystallinity of a semi-crystalline polymer grows, so does its tensile strength. Drawing-induced deformation: Drawing-induced deformation of a polymer results in a finely oriented chain structure, and the increased secondary interchain bonding structure increases the polymer's tensile strength. The tensile strength of the material also increases as a result of annealing an undeformed substance.
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use the myhill-nerode theorem to prove that the languages in exercise 1.29 (a and c), page 88 and problem 1.46 (b and c) page 90, are not regular. Aa. A1 = {01" 2" | n >0} b. 12 = {www w€ {a,b}*} Ac. Az = {a?" | n >0} (Here, a?" means a means a string of 2" a's.)
A string, often known as a word, is a limited collection of an alphabet's symbols.
Instances of strings over the letters "a, b" include "b, a" and "aabab," whereas "0, 10" and "001" are examples of strings over the letters "0, 1." A language is a collection of words written in an alphabet. As a result, (b + ab)* can be used to represent a string before the aa. Therefore, if a language string contains aa, the regular expression (b + ab) applies. *aa(b + ba)* The requirement is that every string created by the regular expression must have at least two a's, but there is no restriction on the quantity or placement of b's and c's. Therefore, (a+b+c)*. (a+b+c)*.
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what electronic component is generally used to change the ac voltage into dc voltage in large dc motor controllers?
SCR because it can be controlled with reference to the point in the cycle at which it will turn on.
use channel 1 of your oscilloscope to monitor the voltage vc across the capac- itor while using channel 2 to monitor the voltage vr across the resistor.
There are two ways to detect current using an oscilloscope, even though the majority of them can only directly measure voltage.
What is oscilloscope?
An oscillograph, which was the previous name for an oscilloscope, is a device that graphically displays electrical signals and illustrates how those signals change over time.
Through a sensor connection, a device that generates an electrical signal in response to physical stimuli like sound, light, and heat, it is able to measure these signals. A microphone, for instance, is a sensor that turns sound into an electrical signal.
Shunt resistors can be used as feedback devices in some power supply designs; measure the voltage dropped across one. An oscilloscope can be used to measure a time constant to determine the real capacitance of a device or the amount of dispersed capacitance in an electrical system.
From one peak to the next, count the horizontal divisions of your oscillating signal (i.e., peak to peak). The period of the signal is then calculated by multiplying the number of horizontal divisions by the time or division. The frequency of the signal can be calculated using the following formula: frequency=1/period.
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water (10 oc) flows with a speed of 2 m/s through a horizontal run of pvc pipe. the length of the pipe is 50 m, and the pipe is schedule 40 with a nominal diameter of 2.5 inch. calculate: a) the pressure drop in kpa b) the head loss in meters c) the power in watts needed to overcome the head loss
The pipe is schedule 40 and has a nominal diameter of 2.5 inches. It is 50 meters long. Then pressure drop is 29.1kpa,Head loss is 2.967m and power is 176.986 watt.
a)Pressure drop = 32μVL/D²
=32*1.307*10⁻³*2*50/0.0119882
=29102.6 pascal
=29.1 Kpa
b)Head loss=p1-p2/pg=29.1*10³/999.7*9.81
=2.967 m
c)power=(p1-P2)q
=29.1*10³*6.082*10⁻³
Power =176.986 watt //watt is the unit of power
The difference in total pressure between two points on a network used to transport fluids is known as a pressure drop. When frictional forces acting on a fluid as it flows through the tube, brought on by the resistance to flow, occur, a pressure drop happens.
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6 In the figure shown, shaft A, made of AISI 1010 hot-rolled steel, is welded to a fixed support and
is subjected to loading by equal and opposite forces F via shaft B. A theoretical stress concentration
Kts of 1.6 is induced by the 3 mm fillet. The length of shaft A from the fixed support to the connection
at shaft B is 1 m. The load F cycles from 0.5 to 2 kN.
a) For shaft A, find the factor of safety for infinite life using the modified Goodman fatigue failure
criterion.
b) Repeat part(a) using Gerber fatigue failure criterion.
Answer:
Explanation:
Calculate the factor of safety for infinite life using modified Goodman fatigue failure.
Tmax =16KfsTmax /πd^3
HB =200, r=3 mm, qs = 1
Kfs=1+qs(Kts-1)= 1+1(1.6-1) = 1.6
Calculate the maximum and minimum torque.
Tmax=2000(0.05) = 100 N. m
Tmin=500 /2000 (100)
Tmin= 25 N.m
Calculate the maximum and minimum shear stress on the shaft.
Tmax= 16(1.6)(100) (10-6) /π(0.02)3 = 101.9 MPa Tmax
Tmin=500 /2000 (101.9)
Tmin=7.4 N. m
Kb=(7.4/7.62) ^-0.107
Kb=0.59
Se=0.917(1.003)(0.59)(161.3) = 87.5 MPa
nf = 1/ (Ta/Se)+(Tm/Ssu)
=1 /(38.22/87.5)+(63.68/214.4)
= 1.36
b)
Calculate the factor of safety for infinite life using modified Gerber fatigue failure.
nf=1/2 (Ssu/Tm) ^2 Ta/Se [ -1+square root of 1+
(2Tm Se/Ssu Ta) ^2]
= 1/2 (214.4/63.68) ^2 (38.22/87.6) {-1+square root of 1+ [2(63.68) (87.5) /214.4 (38.22) ]^2
=1.70
= 25.46 MPa
Calculate the mean stress.
Tm = 1/2 (101.9+25.46)
= 63.68 MPa
Calculate the average stress.
Ta= 1/2
Ta= 1/2 (101.9-25.46)
=38.22 MPa
Ssu=0.67Sut
= 0.67(320)
= 214.4 MPa
Ssy = 0.577Sy
= 0.577(180)
= 103.9 MPa
Se = 0.504(320)
= 161.3 MPa
ka =57.7(320)-0.718
= 0.917
de = 0.370(20)
what process variable is affected when the cooling tower performance has an increase in ambient temperature that causes and increase in cooling tower demands
The process variable that is affected when the cooling tower performance has an increase in ambient temperature is lowering the efficiency of the condenser and reducing the cooling power.
The factors that is influenced performance of cooling tower are:
RangeHeat loadAmbient wet-bulb temperature or relative humidity.Approach.The temperature difference between the hot water inlet and cold water outlet at the tower is called a range. The temperature of tower's ambient is generally 4 ° C to 6 ° C (or even higher) less than the ambient temperature. Because of the temperature is cool, the cooling tower ready to cool the water at a temperature below ambient temperature. The impact of ambient temperature makes energy consumption increase.
Learn more about ambient temperature: https://brainly.com/question/14039991
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