Answer:
technician a and b are correct
in the construction of a large reactor pressure vessel, a new steel alloy with a plane strain fracture toughness of 50 mpa-m1/2 and a y value of 1. an in-service stress level of 150 mpa has been calculated. what is the length of a surface crack (in mm) that will lead to fracture?
The length of a surface crack that will lead to fracture is 35.29mm.
What do you mean by surface crack?
The surface crack in flexure (SCF) method employs a Knoop indentation to create a tiny semielliptical surface precrack in a bent bar. The DC Potential Drop Method can detect surface crack configuration. The crack shape can be determined with some accuracy by measuring the potential difference distribution along the surface cracks of a structural material subjected to DC current.
given, Kiс=50mpa√m
Y= 1.0
б=150mpa
find a= ? in(mm)
Formula,
Kic=Y.б√πa
where, Kic= Toughness due to fracture
б= applies stress
a= length of the crack
Y= Factor (geometrical)
Now, Kic=Y.б√πa
50=(1.0).(150).√πa
∴0.333= √πa
a= (0.333)²/(√π)
=0.03529m
=35.29mm
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when combustibles are covered with no. 24-gauge sheet metal with a 1-inch ventilated air space, the required 18-inch clearance from the rear of an appliance may be reduced to how many inches?
The required 18-inch clearance from the rear of an appliance can be decreased to 6 inches when combustibles are covered with no. 24-gauge sheet metal with such a 1-inch ventilated air space.
What do you mean by sheet metal gauge?
A sheet metal gauge specifies the typical thickness of sheet metal for a given material. The material thickness reduces as the gauge number increases. Steel sheet metal thickness gauges are weighted at 41.82 of pounds per square foot per inch of thickness. This is known as the Sheet Steel Manufacturers' Standard Gage. Other materials, such as aluminium and brass, will have varying thicknesses
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a panel of ti-6al-4v titanium has an edge flaw 3.5 mm deep. what is the critical stress for crack propagation if the part is loaded perpendicular to the flaw and y for this geometry is 1.24? answer in mpa to 3 sig figs.
The critical stress for crack propagation if the part is loaded perpendicular to the flaw and y for this geometry is 1.24 is 769.27Mpa.
What exactly is critical stress?
Critical stress is a set of physical and psychological symptoms that might occur as a result of being involved in a traumatic critical occurrence. The body's common reaction to an abnormal event is critical incident stress.
Ti-6A1-4V has edge flaw 3.5mm deep
Y = 1.24
KIc for Ti-6A1-4V alloy is 100MPa.m[tex]^{1/2}[/tex]
KIc =σ Y[tex]\sqrt{\pi C}[/tex].
given crack is edge crack, so c= 3.5 × 10⁻³
1m= 1000mm
1mm=10⁻³m
σ = [tex]\frac{100}{1.24\times\sqrt{\pi \times 3.5 \times 10^{-3} } }[/tex] = 769.27Mpa
Critical stress for crack propagation is 769.27Mpa
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define the terms grading and maximum aggregate size, as used in concrete technology. what considerations control the choice of the maximum aggregate size of aggregate in a concrete? discuss the reasons why grading limits are specified.
Grading is the process of separating coarse aggregate from fine aggregate. The maximum aggregate size is the largest particle size that can be used in concrete.
What is grading?
Grading is the job of assuring a level or sloped base for a building work such as a foundation, the base course for a road or railway, landscape and garden enhancements, or surface drainage in civil engineering and landscape architecture construction. The earthworks produced for this reason are commonly referred to as the sub-grade or final contouring.
The choice of maximum aggregate size is determined by the following considerations: 1. The maximum aggregate size should be small enough to prevent the formation of voids in the concrete. 2. The maximum aggregate size should be large enough to allow for proper compaction of the concrete. 3. The maximum aggregate size should be such that the concrete will have the desired workability.
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technician a says that the pcv system should create a slight pressure in the crankcase at idle. technician b says that the pcv system should create a slight vacuum in the crankcase at 2,500 rpm. which technician is correct?
When technician A says that the PCV system should create a slight pressure in the crankcase at idle and Technician B says that the PCV system should create a slight vacuum in the crankcase at 2,500 RPM. The correct technician is Technician B.
What is a PCV System?It is to be noted that the PCV controls the pressure used to clear blow-by gases from the crankcase. The pressure-regulating valve lowers the vacuum effect in the crankcase by directing away the blow-by gases. This keeps the engine seals from being damaged (which could be blown out if the pressure gets too high).
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Full Question:
Technician A says that the PCV system should create a slight pressure in the crankcase at idle. Technician B says that the PCV system should create a slight vacuum in the crankcase at 2,500 rpm. Which technician is correct?
A) technician A
B) technician B
C) both technicians A and B
D) neither technicians A nor B
an engineer receives an alert from a mobile system equipped with an rfid tag. upon investigating, the mobile system is missing from its assigned station. which alarm type prompted the engineer to investigate?
Since the engineer upon investigating, the mobile system is missing from its assigned station. the alarm type that has prompted the engineer to investigate is Proximity.
Is RFID a sensor for Proximity?On a more fundamental level, RFID tagging is just a sophisticated proximity sensor. When a piece of metal is there, a proximity sensor notices that a pallet has just arrived there.
Note that Tags and readers are the two halves of the wireless system known as Radio Frequency Identification (RFID). The reader is an electronic gadget with one or more antennas that transmit radio waves and take in signals from RFID tags.
Hence, it is seen as a tool that detects the presence of nearby objects. A proximity sensor on a mobile phone is typically used to determine when the phone is held close to the face. The answer is proximity because the mobile system is far from where the signal can pick.
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technician a says to bleed the conventional brake system before bleeding the abs modulator. technician b says a scan tool may be required to bleed the abs modulator. which technician is correct?
Answer:
technician B
Explanation:
your abs modulator is next to your resivor
Technician b is correct. This is right that a scan tool may be required to bleed the abs modulator.
ABS is the acronym for (Anti-locking Braking System). You have the choice of using the steering wheel while braking or turning using this method. When you push the brake pedal, the brake rotor is covered by an unlocked brake pad, giving you complete control of the car in challenging situations.
In other words, this technology uses speed sensors on each wheel to detect when the wheels lock up. When this occurs, the brakes are quickly applied and released in pulses, allowing the wheel to spin freely and prevent spilling while directing the vehicle.
The first indication that your ABS module and the entire braking system need to be bled to get rid of the extra air in the brake system is if you noticed that the brake pedal is particularly spongy or mushy. The ABS system may experience certain issues as a result or become weaker.
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tech a says that variable valve timing allows the engine's piston displacement to be increased or decreased. tech b says that in-block cams usually include variable valve timing. who is correct?
Tech A a says that variable valve timing allows the engine's piston displacement to be increased or decreased.
What is engine piston?
Among other related systems, pistons are found in reciprocating engines, rotary pumps, gas compressor, hydraulic cylinders, and pneumatic cylinders. It is the moving part that is enclosed in a cylinder and sealed off from the gas by piston rings. Its function in an engine is to use a piston rod and/or connection rod to transmit force from the expanding gas within the cylinder to the crankshaft. For the goal of compressing and ejecting the fluid in the cylinder, the function is reversed in a pump, when force is transferred from of the crankshaft to the piston. By closing and opening apertures in the cylinder, the piston can also function as a valve in some engines.
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tech a says that lead oxide acts as an insulator on the battery posts and has to be scraped away. tech b says that current can leak across the dirt on the surface of the battery. who is correct?
According to the question of lead oxide, both A and B are correct.
What is lead oxide?
Lead oxide, often known as lead monoxide, is an inorganic chemical having the molecular formula PbO. PbO exists in two polymorphs: litharge with a tetragonal crystal structure and massicot with an orthorhombic crystal structure. PbO's modern applications are mostly in lead-based industrial glass and industrial ceramics, particularly computer components. According to X-ray crystallography, both polymorphs, tetragonal and orthorhombic, have a pyramidal four-coordinate lead core. The four lead-oxygen bonds are the same length in the tetragonal form, whereas two are shorter and two are longer in the orthorhombic form. The pyramidal structure suggests the presence of a stereo chemically active lone pair of electrons.
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tech a says fuel line pressure may be relieved by disabling the fuel pump and running the engine until it stops. tech b says the only safe way to relieve fuel pressure is to open the fuel return line at a fitting away from the engine. who is correct?
Technician A states correctly as the fuel line pressure is relieved by disabling the fuel pump and operating the engine until it stops.
Relieving the fuel pressure from the engine is considered a vital mechanism. There are numerous methods that can be used to relieve fuel pressure. Disabling the fuel pump is one such method that is used to relieve fuel pressure on the vehicle engine. In this method, the fuel pump fuse is removed/disabled, and then the engine is started until it stalls. Therefore, we can say that technician A is correct.
However, the fuel pressure cannot be relieved by opening the fuel return line at a fitting away from the engine. So, technician B is incorrect who recommends the opening of the fuel return line to be fitted away from the engine in order to relieve fuel pressure.
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a cranking current test is performed, and the amperage is found to be less than specification. technician a says the starter is bad and it should be replaced. technician b insists on testing the resistance of the cables, grounds, and connections. who is correct?
According to the question of resistance, technician b is correct.
What do you mean by resistance?
The resistance of an electrical circuit to current flow is measured. Although the term "resistance" may sound negative, it has a good application in electricity. The Greek letter omega represents resistance, which is measured in ohms ().Resistance cannot be measured in an active circuit. As a result, troubleshooting personnel frequently assess resistance by measuring voltage and current and applying Ohm's Law.
Resistance in the cables, grounds, and connections can cause the starter to draw too much current. the cranking current test will indicate if the starter is good.
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A brake drum has a discard diameter specification of 11.420 inches and a maximum refinish specification of 11.390 inches. If the drum currently measures 11.362 inches, what are your options
Answer:
throw it out
Explanation:
if it need to be discareded at 11.420 and its already at 11.362 its no longer in the guidlines for operation, by refinishing your taking away material.
a microphone produces a voltage of 2mv and has an internal resistance of 300 ohm. the microphone is connected to an amplifier with an input impedance of 1k-ohm, an output impedance of 50 ohm, and a voltage gain of 50db. the amplifier output is connected to a 75 ohm load. what is the output voltage?
If the microphone produces a voltage of 2mv and has an internal resistance of 300 ohm, the amplifier output voltage would be 75mv.
What is voltage?
Voltage is the difference in electric potential between two points, often known as electric pressure, electric tension, or (electric) potential difference. It refers to the labour required per unit of charge to move a test charge between two places in a static electric field. The derived unit for voltage in the International System of Units is called volt. Work per unit charge is defined in SI units as joules per coulomb, where 1 volt equals 1 joule (of work) for 1 coulomb (of charge).
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an ideal otto cycle has a compression ratio of 7.4 and produces a net work output of 328.1 kj/kg. at the beginning of the compression process, air is at 282 k and 193.4 kpa. calculate the mean effective pressure for the cycle in kpa. 906.53 1.35 1.96 379.37 none of the above
The compression ratio and the equation = cp/cv determine the thermal efficiency of the air-standard Otto cycle.
With a higher compression ratio, the ideal Otto cycle becomes more thermally efficient. We come to the conclusion that the thermal efficiency of the air-standard Otto cycle is a function of the compression ratio and = cp/cv after rewriting the calculation for thermal efficiency using the compression ratio. The constant volume heat addition cycle, often known as the Otto cycle, takes into account one unique instance of an internal combustion engine where the combustion is so quick that the piston does not move, leading to the assumption that combustion occurs at constant volume.
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technician a says that if a fuse blows as soon as it is installed, a short to ground is indicated. technician b says the component will not turn off if the short to ground is on the ground side of the load component but before a grounding switch. who is correct?
Both technicians A and B are correct. It is because when a just-installed fuse blows, it indicates a short-to-ground. If the short-to-ground is on the ground side of the load component and before a grounding switch, the component is not turned off.
A short-to-ground is a term used to refer to a short circuit that has a direct connection to the ground. A short-to-ground in the electrical system can cause a fuse to blow when a component is just installed. When a short-to-ground occurs on the ground side of the installed component but before a grounding-side switch, it usually not results in turning the component off.
As per the above description, it is concluded that both technician A and technician B state correctly.
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for non-functional requirements in requirements engineering what are the constraints that the system must satisfy as well as the standards that the delivered system must meet?
The system must satisfy the constraints of the problem domain as well as the standards of the delivered system.
What is delivered system?
A courier is a business or individual who transports a package from one location to another. FedEx, Parcel Monkey, and Hermes Group are a few well-known examples. The Royal Mail is somewhat of an anomaly, as are the majority of delivered system. In order to provide more specialised or regional services, deliver multiple shipments, and relieve sellers of obligation, courier delivery services are frequently utilised for e-commerce fulfilment. While larger firms may have contracts using courier services for cost-effective mass delivery, smaller enterprises, like independent merchants, are more likely to rely on public services like the Royal Mail.
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Vehicle C is about to begin backing into the parking stall.
How much distance should there be between vehicle C and
the vehicle on its right?
3 feet should be there between vehicle C and the vehicle on its right.
What is a vehicle?
A vehicle is a machine used to transport people or goods. Wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses, disabled mobility scooters), railed vehicles (trains, trams), watercraft (ships, boats, underwater vehicles), amphibious vehicles (screw-propelled vehicles, hovercraft), aircraft (aeroplanes, helicopters, aerostats), and spacecraft are examples of vehicles. Land vehicles are broadly classified based on how they apply steering and drive forces to the ground: wheeled, tracked, railed, or skied. ISO 3833-1977 is the standard for road vehicle types, terms, and definitions, which is also used in international legislation. Over one billion bicycles are in use worldwide. There were an estimated 590 million cars and 205 million motorcycles in service worldwide in 2002.
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on a vehicle with dual filament brake / taillight bulbs, whenever the brake pedal is pressed the taillights as well as the brake lights of the vehicle illuminate dimly. technician a says the brake lights / taillights may have a poor ground connection. technician b says the brake light switch may have excessive resistance. who is correct?
Technician A exists correct. In contrast to brake lights, which turn on instantly when you hit the brakes, tail lights are activated by turning on your headlights or applying the parking brake.
Why would the brake warning light come on when you press on the foot brake?When you press on the brake pedal, friction material from the brake pads snags the rotors. Over time, that friction substance deteriorates. When your brake pads are getting close to their minimum thickness, tiny sensors recognize it and turn on the dash light to alert you that it's time for brake maintenance.
In contrast to brake lights, which turn on instantly when you hit the brakes, tail lights are activated by turning on your headlights or applying the parking brake. The brake lights are a brighter red than the tail lights, which are typically red on cars.
One of three things could be the case if one or more of your brake lights aren't functioning properly: either the brake light system fuse has blown, the brake light bulbs have burned out, or the brake light wire switch has malfunctioned. These problems are all simple to fix.
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Which tool is used to measure movement
Dial indicator
Feeler gauge
Inside micrometer
Outside micrometer
Answer:
Inside micrometer
Explanation:
technician a says that the cranking circuit should be tested for proper amperage draw. technician b says that an open in the control circuit will not prevent starter motor operation. which technician is correct?
Technical A is correct; check the cranking circuit for adequate amperage draw.
What is the operation of a starter motor?When you turn on the ignition, an internal electromagnet inside the body activates and forces a rod with a pinion connected outward. As the pinion and flywheel make contact, the starter motor rotates.This causes the engine to spin and pull in air (as well as fuel). A starter is a device that rotates (cranks) an internal combustion engine so that it can begin running on its own power. It is also referred to as a self-starting, cranking, or beginning motor.The starter motor is powered by the solenoid, which assists in moving the starter gear forward so that it meshes with the engine flywheel.This flywheel is attached to the crankshaft of the engine and rotates with it as the starter motor turns.To learn more about starter motor operation, refer to:
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on the i-35w bridge, fatigue cracks in the deck truss and in the approach span girders were observed in an inspection. what was the solution devised to deal with this cracking?
An assessment of the i-35w bridge revealed fatigue cracks in the deck truss and approach span girders. Fatigue crack arresting holes were drilled in the components to deal with this cracking.
What is fatigue?
Fatigue is defined in materials science as the beginning and propagation of cracks in a material caused by cyclic loading. Once a fatigue crack has begun, it expands a little amount with each loading cycle, resulting in striations on some portions of the fracture surface. The crack will continue to grow until it reaches a critical size, which occurs when the crack's stress intensity factor exceeds the material's fracture toughness, resulting in rapid propagation and, in most cases, total fracture of the structure.
An inspection in 2001 revealed fatigue cracks in the deck truss and approach bridge girders on the I-35 Bridge. Because of the fissures, the cross girders were also distorted. As a result, the problem was managed by cutting holes in the components and adding support struts to the cross girders for added stability.
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alternators have all of the following characteristics except: group of answer choices greater wattage output at lower rpm. lower maximum rpm. smaller physical size and weight for a given output. greater reliability and longer service life.
Option d is correct
The alternators do not provide greater reliability and longer service life. This is because any sudden change in the current will result in overheating which will damage it.
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consider that one diode in the bridge rectifier fails shorted. explain how the normal circuit operation changes. does some element overload? does the output change? g
Diodes in rotating rectifiers may fail due to an Open Circuit (OC) or Short Circuit (SC), overloading the exciter and preventing the alternator from running safely. Overheating will cause damage to the Xmer or AC source delivering power to the bridge rectifier.
What happens when a diode shorts in a bridge rectifier?A direct short-circuit is said to occur whenever one diode is damaged and this is detected by the available AC power supply. Now, overheating will result in a damage to the Xmer Transformer or AC source providing power to the bridge rectifier.
The same symptom occurs in the center-tapped circuit and it will be displayed by an open diode in a full-wave bridge rectifier, as shown in the attached image. During the first half of the input voltage cycle, the open diode tends to stop the current from flowing through RL. The end result would be the Half-wave rectification, and at 60 Hz, it must double the ripple voltage.
Diodes in rotating rectifiers may likely fail as result of Open Circuit (OC) or Short Circuit (SC), overloading the exciter and preventing the alternator from running safely. This is as a result of the aging phenomenon and continuous process regime.
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technician a says that a defective solenoid can cause a starter whine. technician b says that a defective starter drive can cause a starter whining noise. which technician is correct?
Answer:
technician A
Explanation:
your starter drive isnt being pushed out, so that means the drive is spinning but isnt interacting with the fly wheel.
A defective starter drive can produce a starter whining noise. So, only technician B is correct.
A defective starter sound can be of multiple types. Mostly, it is a whining noise. A bad starter produces whining sounds because of a fault in the kicker solenoid. If one drives with a faulty starter, it produces a starter whining noise. Therefore, it is technician B only who states correctly that driving with a defective starter can generate a starter whining noise.
However, technician A who says that a defective solenoid can produce a starter whine is not correct because, with a defective starter solenoid, the engine is not able to crank as a result of the solenoid failing to supply power to the starter motor. Because of this, no starter whine produces.
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the maximum load that a hori-zontal beam can carry is directly proportional to its width. if a beam 1.5 inches wide can support a load of 250 pounds, find the load that a beam of the same type can support if its width is 3.5 inches.
The load that the same type of beam can support is 583.345 pounds if its width is 3.5 inches.
As the maximum load that can be carried by the beam is directly proportional to the width of the beam and a 1.5 inches wide beam can support a load of 250 pounds, an equation can be written as;
L = kw
Here L represents the maximum load supported and w represents the width and k is the constant of proportionality. Therefore;
250 = k × 1.5
Solving for k;
k = 250 ÷ 1.5
k = 166.67
Therefore the equation can be written as;
L = 166.67 w
As the width of the same type of beam is 3.5 inches, the maximum load it can support can be calculated as follows;
L = 166.67 × 3.5
L = 583.345 pounds
Therefore; 583.345 pounds is the maximum load that the beam can support if its width is 3.5 inches.
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describe the result to the 24v secondary on a transformer with a 208/230v dual-rated primary when it is wired for 230v but installed on a 208v system.
The result to the 24v secondary on a transformer with a 208/230v dual-rated primary when it is wired for 230v but installed on a 208v system is 26.538V.
What is transformer?
A transformer is a passive component that transmits electrical energy from one circuit to another, or from many circuits. A changing current in any of the transformer's coils causes a changing magnetic flux in the core, which induces a changing electromotive force (EMF) across any additional coils coiled around the same core. Without a metallic (conductive) connection between the two circuits, electrical energy can be exchanged between separate coils.
given,
transformer rating = 208/230V ∴208=secondary, 230= primary
given, primary rated voltage 230V but installed on 208V system
∴ Primary voltage ratings V₁=208V
Hence, Secondary voltage rating V₂ =(208×208)/230V
given, voltage on secondary = 24V
Voltage on primary = 24×V₁/V₂
=24×(208/(208×208)/230))
=24×(230/208)
=26.538V
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compressors, the gas is often cooled while being compressed to reduce the power consumed by the compressor. explain how cooling the gas during a compression process reduces the power consumption.
The amount of work done by steady flow devices varies with the particular gas volume. The kinetic energy of gas particles decreases during cooling.
When the gas is subjected to intermediate cooling during compression, the gas specific volume is reduced, which lowers the compressor's power consumption. Compression is less adiabatic and more isothermal because the compressed gas must be cooled between stages since compression produces heat. The system's thermodynamic cycle's cold sink temperature is lowered by cooling the compressor coils. By increasing the temperature difference between the heat source and the cold sink, this improves efficiency.
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Describe the purpose of the SPST 12 volt DC master switch
The SPST 12-volt DC master switch is used to turn on and off the power to a device.
What is device?
A device is a physical piece of hardware or software that performs one or more computational functions within a computer system. It can either offer input to the computer or accept output from it. A device is any electronic element that has some computational capability and can install firmware or third-party software. A computer mouse, speakers, printer, and microphone are examples of common hardware. A device is sometimes known as an appliance, gadget, or electronic instrument.
The purpose of the SPST 12 volt DC master switch is to provide a way to turn on and off the power to a device. This switch is typically used to control the power to a lights or other electrical devices.
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when reinstalling a repaired engine, tech a says all components and fasteners should be installed starting at the bottom and working up. tech b says the exhaust pipes must be aligned with the manifolds or headers as the engine is lowered into place on some models. who is correct
Technician b is correct who says that exhaust pipes need to be aligned with the header or manifolds since the engine is lowered into place on some models.
Exhaust manifolds are used to collect exhaust gases from the ports in the cylinder heads of engines, and then route the exhaust gases to the remaining areas of the exhaust system. The exhaust manifolds act as a connection point for the exhaust pipes. In order to make the engines work efficiently and properly, exhaust pipes need to be aligned with exhaust manifolds. It is because when the engine is lower than the exhaust system, it becomes a cause exiting a low amount of exhaust gases.
Thus, it is concluded that only technician b is correct that exhaust pipes and exhaust manifolds must be properly aligned with each other. Whereas technician a is not correct it is because components and fasteners can be installed in any way that seems suitable.
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technician a says that burning of fossil fuels has increased the greenhouse gas co2 in the atmosphere. technician b says that increased lumber operations have removed trees, increasing the levels of co2 in the atmosphere. which technician is correct?
According to the question of fossil fuels, technician A is correct.
What is fossil fuel?
A fossil fuel is a hydrocarbon-containing material that occurs naturally in the Earth's crust as from remains of deceased plants and animals and is gathered and utilised as a fuel. Coal, crude oil, and natural gas are the primary fossil fuels. Fossil fuels can be burned to generate direct heat, power engines, or generate electricity.
Burning of fossil fuels has increased greenhouse gas CO2 levels in the atmosphere. When fossil fuels are burned, significant volumes of carbon dioxide, a greenhouse gas, are released into the atmosphere. Greenhouse gases trap heat in our atmosphere, which contributes to global warming. Already, the average global temperature has risen by 1 degree Celsius.
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