Any compressor's discharge temperature cannot exceed 225 degrees F. if the discharge temperature rises above 225 degrees.
What temperature should a reciprocating compressor's discharge gas line be at?However, many compressor packages will contain components that limit discharge temperature to no more than 148.9°C (300°F). In general, it is advised to never exceed operating discharge temperatures of 176.7°C (350°F).
What are the likely reasons why the compressor discharge has an excessively high discharge pressure?The primary cause of high condensing pressure is high discharge pressure. High condensing pressure can be caused by insufficient condenser heat dissipation, condenser fouling, insufficient cooling air or water volume, and high cooling water or air temperature.
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02-series deep-groove ball bearing is considered as an application with the inner ring rotating, with a design life of 25 kh at a speed of 350 rev/min. the radial load is 2.5 kn and an application factor of 1.2 is appropriate. the reliability goal is 0.90. find the catalog rating c10 with which to enter a bearing table and select an appropriate size bearing.
The reliability goal is 0.90 is reached with given perameter and chosen bearing is correct the C10 catalogue rating would be 14.
R=exp{-{525(3/25.50³-0.02/4.439}^1.483}
=exp{-{0.98/4.439}^1.483}
=exp(-0.106)
=0.919
So, the chosen bearing is correct.
A bearing is a part of a machine that reduces friction between moving parts and restricts relative movement to only that motion that is intended. A fixed axis rotation or free linear motion of the moving part are two examples of possible bearing designs. By controlling the normal force vectors acting on the moving parts, it may also be used to stop movement. To enable the desired motion, the majority of bearings reduce friction. Bearings can be divided into many different groups depending on the type of operation, the motions allowed, or the direction of the loads (forces) applied to the components.
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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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very stiff clays that underlie the houston area are typically fissured. we often find that unconfined compression tests produce unreasonably low estimates of shear strength. why?
The maximum axial compressive stress that a cohesive soil specimen can withstand with no confining stress is known as unconfined compressive strength (UCS).
One of the quickest and least expensive ways to gauge the shear strength of clayey soil is the unconfined compression test. The unconfined compression test is the most popular method of soil shear testing because it is one of the fastest and least expensive methods of measuring shear strength. It is used primarily for saturated, cohesive soils recovered from thin-walled sampling tubes. The primary purpose of the Unconfined Compression Test is to quickly determine a measure of the unconfined compressive strength of rocks or fine-grained soils that possess sufficient cohesion to permit testing in the unconfined state.
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A pull of 40 N inclined at 30° to the horizontal plane, is required just to move a body
placed on a rough horizontal plane. But the push required to move the body is 50 N. If
the push is inclined at 30° to the horizontal, find the weight of the body and co-efficient
of friction.
In mathematics, is equal to F/N, where F is the frictional force and N is the normal force.
What is coefficient of friction?The friction coefficient is the ratio of the normal force pressing two surfaces together to the frictional force preventing motion between the two surfaces. Greek letter mu () is typically used to represent it. In mathematics, is equal to F/N, where F is the frictional force and N is the normal force. The coefficient of friction is dimensionless because both F and N are expressed in units of force (such as newtons or pounds). For both static and kinetic friction, the coefficient of friction has different values. When an object experiences static friction, the frictional force resists any applied force, and the object stays at rest until the static frictional force is removed. In kinetic friction, the frictional force opposes the motion of the object.The coefficient of kinetic friction for a brick sliding on a clean wooden table is approximately 0.5, meaning that a force equal to half the weight of the bricks is needed to simply overcome friction in order to keep the bricks moving along at a constant speed. The coefficient of static friction is approximately 0.6. The frictional force itself is focused in the opposite direction of the object's motion.To Learn more About frictional force refer To:
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The rule of 10 states that a measuring instrument should
A. Have one tenth the resolution of the tolerance.
B. Be 10 times more accurate than the tolerance you are trying to hold.
C. Be 10 times more accurate than your reference standard.
D. Be graduated in tenths.
The rule of 10 states that a measuring instrument should have one tenth the resolution of the tolerance. Hence option A is correct.
What is resolution?Resolution is defined as a term used to describe how clear and sharp an image or picture is. Resolution describes how many pixels are shown for an image per inch.
According to the Rule of Ten, the measuring device's discrimination should divide the tolerance of the characteristic under test into ten parts. In other words, the measuring device or gage needs to be at least ten times more accurate than the characteristic being assessed.
Thus, the rule of 10 states that a measuring instrument should have one tenth the resolution of the tolerance. Hence option A is correct.
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if the mixing ratio is 3.0 g/kg and the dry air temperature is 55f, what is the saturation mixing ratio?
A thermodynamic function of condition; the saturated air mixing ratio at the specified temperature and pressure.
How to Calculate a Mixing Ratio?The ratio of moist to dry airborne particles is referred to as the "mixing ratio" in the study of the atmosphere. Though it can also apply to other elements, it has a similar concept to humidity. It is possible to calculate a mixing ratio for gases other than water, such as argon or ozone. The earth's atmosphere is significantly impacted by even minor changes in the elemental mixing ratios. Depending on the data you already have, you can calculate the mixing ratio in a variety of ways. Using the saturation mixing ratio and humidity, the mixing ratio can always be calculated.The saturated mixing ratio and the relative humidity should be noted. Determines the amount of moisture in the air, humidity is a word you frequently hear on weather channels. At a given temperature, the maximum amount of water vapor that can be held in the air is known as the saturated mixing ratio. Let's say, for illustration purposes, that the saturated mixing ratio is 0.5 and the relative humidity is 0.8.The saturated mixing ratio multiplied by the mixing ratio. In this case, the solution is 0.8 x 0.5, which equals 0.04.In the previous step, multiply the response by 100. The response in our example is 0.04/100, or 0.004. Your mixing ratio is this response.By dividing the mixing ratio by the saturated mixing ratio and multiplying your result by 100, you can double-check your response.To Learn more About mixing ratio refer to:
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7.124 the cylindrical tank ab has an 8-in. inner diameter and a 0.32-in. wall thickness. it is fitted with a collar by which a 9-kip force is applied at d in the horizontal direction. knowing that the gage pressure inside the tank is 600 psi, determine the maximum normal stress and the maximum shearing stress at point k
No, generally it is not. It could be zero for specific loading conditions. Since they are equal but with opposite signs then their average is zero.
For example, if you put a stress element under tension in the x direction and compress it in the y direction with equal stresses such as sigma_x=sigma_y, this will give you a stress element if rotated by 45 degrees will give you the maximum shear planes with zero normal stresses. So generally that's not the case. The general case is that you will get the average normal stress when you get the maximum shear stress. In the example I mentioned before if we consider the compression and tension natures of the stresses, we assumed then sigma_y should be negative because it's compression and sigma_x is positive because it's tension.
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PSPICE 6.23 MULTISIM Assume that the initial energy stored in the inductors of Figs. P6.23(a) and (b) is zero. Find the equiva- lent inductance with respect to the terminals a, b. Figure P6.23 (a) 12 mH 24 mH 10 mH 520 mH 30 mH 15 mH 9 mH3 8 mH (b) 25 uH 18 uH 20 uH 60 uH 30 H 1) UH 312 pH 15 pH 38 pH
A mass moving at a certain speed is comparable to an inductor conducting current. In other words, a coil carrying current stores energy
In its magnetic field, which equals 1/2 Li2, just like a moving mass has kinetic energy = 1/2 mv2. Actually, the magnetic field produced by the current passing through the inductor is where this energy is kept. The energy is stored without being lost in a pure inductor, where it is released back into the circuit when the inductor's magnetic field collapses and the current through it is ramped down. The charge Q and voltage V between the capacitor plates are related to the energy U C U C stored in a capacitor because it is electrostatic potential energy.
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Which Statements below are true?
One of the primary advantages of simulation models is that they enable managers to answer what-if questions about changes in systems without actually changing the physical systems themselves.
When we solve a nonlinear programming problem (NLP), it is very possible that Solver will obtain a suboptimal solution.
A correlation matrix must always have 1’s along its diagonal (because a variable is always perfectly correlated with itself) and the correlations between variables elsewhere.
The built-in functions in Excel, along with the RAND function, can be used to generate random numbers from many different types of probability distributions.
A common distribution for modeling product lifetimes is the binomial distribution.
The random nature of games of chance make them poor candidates for simulation.
One of the primary advantages of simulation models is that they enable managers to answer what-if questions about changes in systems without actually changing the physical systems themselves. (True)
What is simulation models?A physical model's performance in the real world is predicted by creating and examining a digital prototype of the physical model. Designers and engineers use simulation modeling to determine whether, under what circumstances, and in what ways a part could fail as well as what loads it can withstand.
Fluid flow and heat transfer pattern prediction can also be aided by simulation modeling. By using simulation software, it analyzes the approximative working conditions.
By using simulation modeling, engineers and designers can analyze designs for new or existing parts without repeatedly building physical prototypes. Users can investigate a variety of digital prototypes before producing the physical prototype.
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The link AB is connected to a collar that moves on a vertical guide bar. The link is joined to the collar through a pin joint at A. dot y = 4.1 m/s doubledot y = 6.8 m/s^2 theta = 25.1 degrees
dot theta = 1 rad/s doubledot theta = -1.1 rad/s^2 and L = 0.68 m. Determine the horizontal component of a_B (positive is to the right). Specify your answer in m/s^2 to 3 decimal places.
The horizontal component of a_B is moving right with an acceleration with an angle θ at 8.2014 m/s².
Y.=4.1
y..=6.8
Angle θ=25.1
θ.=1rad/s²
θ..=-1.1rad/s²
L=0.68 m
Accelaration at b
ab=a=(α+rn)-ω².rb/a
rb/a=rb-ra
rb/a=0.416i+0.277j
aB=-2.0128i+8.2014j
a(b)=8.2014 m/s²
It measures how quickly velocity changes over time. Acceleration formula. Change in Velocity/Time Taken = Acceleration. (Final Velocity - Initial Velocity)/Time Taken is the formula for acceleration. The second object always applies an equal and opposing force to the first whenever one object applies a force to another. According to his third law, there is an equal and opposite reaction to every force (action) in nature.
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Entrapment and transfer of hear from the sun to a building without use of machinery
passive solar system
Entrapment and transfer of hear from the sun to a building without use of machinery : passive solar system
What are the three solar passive system?Distribution: The process by which solar heat is transferred from the locations of collection and storage to the various rooms in the house. The three natural heat transport modes—conduction, convection, and radiation—will be used entirely in a purely passive design.Absorber: The storage element's densely darkened, hard surface. The surface, which can be a stone wall, a floor, or a water container, is directly exposed to the sun. Heat is produced when sunlight strikes the surface.Thermal mass : substances that capture or store the heat produced by sunlight. The thermal mass is the substance beneath and below the exposed surface of the absorber.Aperture/Collector: The expansive glass area that lets light into the building. During the heating season, the aperture(s) should face within 30 degrees of true south and not be blocked by any other structures or trees from 9 a.m. to 3 p.m.Learn more about passive solar system refer to :
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A uniform rod BC of mass 4 kg is connected to a collar A by a 250-mm cord AB. Neglecting the mass of the collar and cord, determine (a) the smallest constant acceleration aA for which the cord and the rod lie in a straight line, (b) the corresponding tension in the cord. 250 mm 400 mm 350 mm
(a) The smallest constant acceleration aA for which the cord and the rod lie in a straight line is, a[tex]_A[/tex] = 4.09 m/sec².
(b) The corresponding tension in the cord is, T = 42.5 N.
What is tension?The force transmitted through a rope, string, or wire when pulled by forces acting from opposite sides is referred to as tension. The tension force is applied along the entire length of the wire and exerts an equal amount of force on the bodies at each end.
Every physical object that comes into contact with another one applies some sort of force. Depending on the type of object, these contact forces have different names. You can refer to a force as tension if a rope, cable, or chain is one of the objects it is pulling on.
Ropes and cables are useful for exerting forces because they effectively transfer a force over a limited distance (e.g. the rope length). Because ropes cannot effectively push, tension must be considered the pulling force.
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3) largest cluster of ones. assume in figures h7p3 we need to count the largest group of consecutive ones (instead of leading ones that we did in hw6, p3). for example if x
We must first transform the documents into numerical features in order to work with text data.
We will employ sparse matrices for the remaining tasks in the assignment. A sparse matrix is one that only contains a few nonzero entries. To reduce space and speed up calculation, a useful data structure for sparse matrices would only keep the nonzero values. A sparse matrix library that is well efficient is included in SciPy. For SciPy sparse matrices, many matrix function that are accessible for NumPy arrays are also available.
Dictionary format is first converted to the SciPy sparse matrix format. You can skip the next block and treat the function as a black box if you'd like, but we provided plenty of comments for those who are interested.
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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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design a rc low pass filter with cut-off frequency of 1khz. find one feasible combination of the r, c values of the circuit. what is the voltage gain of the filter circuit at 10khz frequency?
The voltage gain of the filter circuit of frequency is 10khz
What is voltage gain ?It is typically used in electronics to describe the amplification of a signal. While current gain is the ratio of output current to input current, voltage gain is the ratio of output voltage to input voltage.
voltage gain and current gain Pac dI iB = Ai The ratio of the transistor's input current to output current is known as current gain, or AI. A; = Bac = dic - ic for the CE amplifier in the forward active zone. The ratio of the transistor's input to output voltage is known as voltage gain (Ay).
Given ,
frequency = 1
filter circuit = 10
voltage gain = 10/1
= 10khz
Therefore the voltage gain is 10 khz
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technician a says that the upper shell of a main bearing is identified by a marking on the back of the shell. technician b says that the upper main bearing shell will always have a hole in it. who is correct?
Technician b is correct that he says affirms that the top main bearing shell will always be pierced by a hole.
A housing, shaft, and lubricant are other parts of the system, which also contains a bearing shell. As a result, they must be developed in concert with the bearing shell as a part of a bearing system as the dependability of the bearing shells is dependent on these other components. Their main objective is to make this rotation of the components almost wear-free. Plain bearings consist of one or two bearing shells that are tightly secured within the bearing seat. The spinning shaft is encircled by the bearing shells at the bearing journals. A steel alloy shell serves as the foundation for every bearing insert, upon which the softer bearing componentsis connected. Bearings may currently be divided into two main categories: those made of aluminum alloy or copper/lead alloy.
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The automatic antenna tuner on the ft-dx10 is designed to ensure what ohm antenna impedence is presented?.
At amateur operating frequencies, the FTDX10 is designed for 50 Ohm resistive impedance.
What is meant by Impedance?Impedance is the sum of resistance and reactance. It was defined as anything that can obstructs the flow of electrons within the electrical circuit. As a result, it influences current generation in the electrical circuit. It could be found in all the possible circuit components and across all possible electrical circuits. Impedance is represented mathematically by the letter Z and has the unit ohm. It's a mix of resistance and reactance.
Z stands for impedance, which is an expression of the resistance to alternating and/or direct electric current that an electronic component, circuit, or system offers. Resistance and reactance are two independent scalar (one-dimensional) phenomena that make up the vector (two-dimensional) quantity known as impedance.
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technician a says that synthetic oils can be used to extend oil change intervals because they do not become contaminated as quickly with soot and dirt as conventional oil. technician b says that synthetic oils can be used longer because they do not oxidize as quickly as conventional oil. who is correct?
Technician b is correct he syas that synthetic oils have a longer shelf life than traditional oils because they do not oxidize as quickly.
Deposits develop during the engine's motor oil circulation. Over time, conventional oils produce sludge from these deposits, decreasing the performance and life of your engine. Full synthetic oils, in contrast, have fewer impurities and don't form deposits or sludge. Conventional motor oil typically lasts five years when stored in unopened containers. Synthetic and semi-synthetic motor oils have a lifespan of seven to eight years. Given that their chemical makeup does not deteriorate over time, synthetic oils can easily provide a service life that is two times as long. Regular olive oil can be stored for up to three years without going bad. The incredible health benefits of coconut oil include everything from clear skin to lowering blood sugar. Long-term preservation of olive oil's properties is possible.
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what does the following code segment do to the array? .data array byte 1, 1, 2, 3, 5, 8 .code mov ebx, offset array mov eax, 3 skip this: ad [eax], byte ptr 2 loop skip this: g
Byte ptr 2 loop skip this: g is the code segment do to the array.
What does an array segment mean?The array is separated into several segments that are all the same size and have additional shared memory space. The frequently changing digit (FCD) of a number is subjected to a preset condition when data is initialized to an array, resulting in the storage of each data item in a particular section of the array.The index can either be a number or a field containing a number, and it denotes the location of the element within the array (beginning from 1).A data structure called an array consists of a set of elements (values or variables), each of which is identifiable by an array index or key. Array types may be confused with or overlap with other data types that describe aggregation of values, such as lists and strings.To learn more about array refer to:
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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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which of the following is true for an npn bjt ? select one: a. the base current consists of mostly holes b. a p-type base is sandwiched between an n-type emitter and an n-type collector c. current flows primarily because of electrons injected into the base d. all of these e. current flows when either vbe or vbc are positive voltages
For an NPN , the base current is primarily made up .
Which of the following statements is accurate about a npn transistor's active region?The potential difference between the collector and the base is always less than 0.4 V, and the base current and collector current are directly proportional to one another.
What are two defining characteristics?Based on the types of the three main terminals, can be divided into NPN and PNP types. An NPN transistor is made up of two semiconductor junctions with a thin p-anode region, and a PNP transistor is made up of two semiconductor junctions with a thin n- cathode region.
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historically, the average grade in chem 1015 is a b-/c . in order for an average student to earn an average grade, the average student would be expected to spend an average of 3 hour(s) a week on the course.
Students who specialize in a major field are better equipped to conduct in-depth research, analyze critically, and use discriminating judgment.
It makes the student ready for more difficult work, graduate school, or the job market right away. This concentration on the academic curriculum does not mean that other aspects of university life, including as social and athletic activities, public speaking and dramatic arts, music, art, public affairs, or other programs, did not contribute significantly to a student's personality development. The intended outcome of these degree programs is not a person who fits into society as it is or perceives their own vocation as being limited to the realm of the regular job, but rather a person who has been intellectually enhanced.
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Technician A says low fluid level in the master cylinder reservoir indicates a leak in the system.
Technician B says for both drum and disc brakes, the friction material rotates with the wheel.
Who is right?
Select the correct option and click NEXT
O A only
B only
Both A and B
Neither A nor B
Technician A says the low fluid level in the master cylinder reservoir indicates a leak in the system. Technician B says for both drum and disc brakes, the friction material rotates with the wheel. Both A and B are correct.
What is a technician?A technician is a person who knows the technicality of machines and other things, They can repair these things.
These rubber rings prevent hydraulic fluid from escaping and keep it free of moisture and impurities. They also cause the piston to return to its off position, allowing the brake pads to disengage correctly when the brake pedal is released.
Therefore, the correct option is c, Both A and B.
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which of the following describe the attributes that extended acls can use to filter network traffic? (select two.) answer extended acls can filter net
Extended ACLs can filter network traffic based on destination hostname or host IP address.
Extended ACLs can filter network traffic based on source protocol (i.e., IP, TCP, UDP, etc.).
What is meant by network traffic ?Network traffic is the amount of data moving through a network at any given moment. Data traffic or simply "traffic" are several names for network traffic. Traffic to a network can be classified as direct, organic, or paid in search engine optimization.
When a network is swamped with more data packet traffic than it can handle, network congestion results. When there are too many simultaneous communication and data requests made over a network with insufficient network bandwidth, data traffic backs up.
Data transfer via the internet is known as IP traffic. Web traffic is yet another name for IP traffic. Since servers—which are used to host websites
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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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Where loads are likely to be on continuously, the calculated load for branch circuits and feeders must be figured at (100%) (125%) (150%) of the continuous load, (plus) (minus) the non-continuous load. This requirement generally (does) (does not) apply to residential wiring.
Where loads are likely to be on continuously, the calculated load for branch circuits and feeders must be figured at 125%.
Section 210.19(A)(1) permits the bigger of the two values listed below to be utilized as the connectors 's ultimate size for sizing an ungrounded branch circuit conductor:
Without any extra adjustments or corrections, either 125% of the continuous load, OR
When adjustment and corrective factors are applied, the load is 100% (not 125% as stated previously).
This will be the same in the 2020 NEC. The introduction of new exception 2 is what has changed. To comprehend this new exception, one must study it very carefully. A part of a branch circuit connected to pressure connectors (such as power distribution blocks) that complies with 110.14(C)(2) may now be sized using the continuous load plus the noncontiguous load instead of 125% of the continuous load thanks to the new exception.
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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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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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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)
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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