Answer:
2:C 3:B
Explanation:
2. It is difficult to determine who is correct without additional information or context about the situation. Both Technician A and Technician B offer plausible explanations for the cause of the filter damage, and it is possible that both factors contributed to the problem. Therefore, the correct answer is (c) Both Technician A and Technician B.
3. Technician B is correct. Diesel exhaust oxidation catalysts do store noxious emissions in the substrate when the exhaust temperatures are low. This is known as "cold start emissions," and the stored emissions are later released when the catalyst reaches its operating temperature. Technician A is incorrect in stating that diesel exhaust oxidation catalysts are like the ones used in automobiles for the last 2 decades, as diesel engines have different emissions profiles and require different types of catalysts. Therefore, the correct answer is (b) Technician B.
Threaded rigid metal conduit or threaded steel in ________ locations shall be used for the last 24 inches of the underground run to emergence.
501.10
According to section 501.10 of the National Electrical Code, threaded rigid metal conduit or threaded steel must be used for the last 24 inches of an underground run to emergence. This is because these materials provide the necessary durability and strength to withstand the pressure and environmental factors that can impact underground electrical systems.
Threaded rigid metal conduit is a type of tubing that is made of steel and is designed to be used in applications where high levels of protection are needed. It is typically used in industrial settings, where the environment is harsh and corrosive. Threaded steel, on the other hand, is a type of metal that is threaded for ease of installation and is often used in electrical applications.Both of these materials are ideal for underground runs because they are resistant to corrosion, moisture, and other environmental factors that can damage electrical systems. Additionally, they are strong enough to withstand the pressure and weight of the soil and other materials that may be above them.In summary, if you are installing an underground electrical system, it is essential that you use threaded rigid metal conduit or threaded steel for the last 24 inches of the run to emergence in order to ensure the safety and reliability of the system.For such more question on installation
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Which syntax imports all static members of class Math? A. import java.lang.Math. B. import static java.lang.Math.C. import static java.lang.MathD. None of the above.
B. import static java.lang.Math. it is important to use import static judiciously and only when necessary, as it can make code harder to read and understand if overused.
In Java, the import static keyword is used to import static members of a class into another class without having to reference the class name each time. This allows for more concise and readable code, especially when working with static utility classes like java.lang.Math. When using import static, you can directly reference the imported static members by their name, as if they were declared in the current class. For example, you could import the PI constant from java.lang.Math and use it in your code like this: double area = radius * radius * PI;. However, it is important to use import static judiciously and only when necessary, as it can make code harder to read and understand if overused.
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To catch an exception, the code that might throw the exception must be enclosed in a ________.a. throws block.b. catch block.c. try block.d. finally block.
The correct answer is c. Try block. In Java, to catch an exception that might be thrown by a block of code, that code must be enclosed in a try block.
A try block is followed by one or more catch blocks, which are used to catch and handle any exceptions that are thrown within the try block.
The basic syntax of a try-catch block in Java is as follows:
csharp
try {
// code that might throw an exception
} catch (ExceptionType e) {
// exception handler
}
The code that might throw an exception is enclosed in the try block. If an exception is thrown, the Java runtime system will search for a matching catch block to handle the exception.
The catch block specifies the type of exception it can handle, using the ExceptionType parameter. If the type of exception thrown matches the type specified in the catch block, the code within the catch block is executed to handle the exception.
In addition to try and catch blocks, Java also provides a finally block, which is used to specify code that should be executed regardless of whether an exception is thrown or caught.
The finally block is optional and is typically used for cleanup code that needs to be executed, such as closing a file or releasing a resource, regardless of whether an exception occurred or was caught.
In summary, to catch an exception in Java, the code that might throw the exception must be enclosed in a try block, followed by one or more catch blocks to handle the exception.
The finally block is optional and is used to specify code that should be executed regardless of whether an exception is thrown or caught.
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(300-5(F)) Backfill used for underground wiring must not damage the wiring method, contribute to the corrosion of the raceway or prevent compaction of the fill.(True/False)
True. 300-5(F) of the National Electric Code (NEC) specifies the requirements for backfill used for underground wiring.
According to this section, the backfill material used must not damage the wiring method, contribute to the corrosion of the raceway, or prevent compaction of the fill. This is important to ensure the long-term safety and reliability of the electrical system, as damage or corrosion to the wiring method can increase the risk of electrical hazards, such as shocks, fires, or explosions. By using an appropriate backfill material that meets the NEC requirements, the wiring method can be protected from damage and corrosion, and the overall safety and reliability of the electrical system can be maintained.
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There shall be more than the equivalent of ____________ quarter bends 360 degrees total between pull point, for example, conduit bodies and boxes.
344.28
According to NEC section 344.28, there should not be more than the equivalent of four quarter bends (or one full 90-degree bend) in a conduit run between pull points, which can include conduit bodies and boxes. This helps to ensure that the conduit run is not excessively curved or difficult to pull wire through.
This requirement is specified in the National Electrical Code (NEC) section 344.28.
Explanation:
1. A conduit is a tube or pipe used to protect and route electrical wiring.
2. Quarter bends refer to conduit bends, with each quarter bend equal to 90 degrees.
3. The term "equivalent" means having the same value or amount.
In this context, the equivalent of four quarter bends (4 x 90 degrees) adds up to a total of 360 degrees. To comply with the NEC requirement, the conduit run should not have bends exceeding this 360-degree limit between pull points, ensuring safe and efficient installation and maintenance of the electrical system.
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Technician A says that the transmission hydraulic pump operates only when the vehicle is in motion. Technician B says that the transmission hydraulic pump operates when the engine is running. Which technician is correct?
Technician B is correct. The transmission hydraulic pump operates when the engine is running, regardless of whether the vehicle is in motion or not.
The best automatic transmission fluids usually claim to improve vehicle fuel mileage, but renewing the fluid will almost always do that. ( Here are some other ways to improve your miles per gallon.) Technician A states that the transmission hydraulic pump operates only when the vehicle is in motion.
While Technician B says that the transmission hydraulic pump operates when the engine is running. In this case. Technician B is correct. The transmission hydraulic pump starts operating when the engine is running, as it is driven by the engine, regardless of whether the vehicle is in motion or not.
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Technician B is correct.
The transmission hydraulic pump operates when the engine is running, regardless of whether the vehicle is in motion or not. The pump is responsible for supplying pressurized hydraulic fluid to the transmission to engage the gears and provide torque to the wheels.
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(310-10(H)(1)) In general, the minimum size phase, neutral or grounded conductor permitted for use in parallel is No. ___.
According to the National Electrical Code (NEC) section 310-10(H)(1), when conductors are installed in parallel is NO. 1/10 AWG.
According to the National Electrical Code (NEC) section 310-10(H)(1), when conductors are installed in parallel, they must be of the same length, have the same insulation and be terminated in the same manner at both ends.
Additionally, the minimum size of the phase, neutral or grounded conductor permitted for use in parallel is No. 1/0 AWG.
This minimum size requirement is based on the assumption that paralleling conductors will be used in large commercial or industrial applications where the electrical load is significant.
Using larger conductors helps to ensure that the load is distributed evenly across the conductors, minimizing voltage drop and improving the overall efficiency and safety of the electrical system.
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_______________ servers can help consolidate multiple machines into one box, saving floor space and electricity.
In addition to saving physical space and energy, virtual servers offer other benefits such as improved reliability, easier backup and disaster recovery, and increased scalability.
Virtual servers can help consolidate multiple machines into one box, saving floor space and electricity. A virtual server is a software-based emulation of a physical server that can run multiple operating systems and applications on a single physical machine. By using virtualization technology, businesses can reduce their hardware costs, minimize energy consumption, and improve resource utilization. With virtual servers, multiple virtual machines can be created and hosted on a single physical server. Each virtual machine has its own operating system, applications, and resources, but they all share the same physical resources of the host machine. This means that businesses can run multiple servers on a single box, saving space and reducing energy consumption.
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A network administrator is upgrading a small business network to give high priority to real-time applications traffic. What two types of network services is the network administrator trying to accommodate? (Choose two.)
The network administrator is trying to accommodate Quality of Service (QoS) and bandwidth management to give high priority to real-time applications traffic in the small business network.
The network administrator is trying to accommodate two types of network services: Quality of Service (QoS) and Traffic Shaping. QoS is a technique that prioritizes certain types of traffic over others, ensuring that real-time applications receive the bandwidth they require. Traffic shaping, on the other hand, manages the flow of traffic on the network, preventing congestion and ensuring that all applications receive the necessary bandwidth.
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A down counter output instruction wi decrement by 1 each time the counted event occurs. true/false
How is energy transferred to foods fried in deep-fat?
Foods that are fried in deep fat receive energy through conduction. The meal is uniformly cooked as a result of the hot oil heating the food's surface, which subsequently transfers heat to the centre.
Food is immersed in heated oil during the deep-frying process of cooking. The food's surface comes into touch with the heated oil when it is placed in the pan. Conduction is the method by which the heated oil conducts heat to the food's surface. Food is evenly cooked as a result of heat conduction from the surface to the centre of the food as it heats up. Conduction, which is the movement of heat through a solid or stationary fluid from a hotter location to a cooler region, is the term used to describe this heat transfer via the meal. As a result, the food receives energy from the heated oil, becoming crispy and delicious.
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One receptacle outlet shall be installed at an accessible location for the servicing of heating, air conditioning, and refrigeration within ______ feet and on the same level as the equipment.
210.63
According to National Electrical Code (NEC) 210.63, the electrical outlet accessing must be installed within 25 feet of heating, air conditioning, and refrigeration utilities that are level with the material.
According to National Electrical Code (NEC) 210.63, the electrical outlet must be installed within 25 feet of the accessing point at the same level as the heating, ventilation, cooling, and cooling equipment. National Electrical Code (NEC), or NFPA 70, is the United States standard for the safety of electrical installations and equipment.
It is part of the National Fire Code series published by the National Fire Protection Association (NFPA), a private trade association. Although the word "state" is used, it is not a federal law. It is often adopted by states and municipalities to regulate electrical safety. In some cases, NECs are revised and amended as local regulations are voted on by local leaders and can be vetoed. The "rule of thumb" ensures that these standards are followed.
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You do not test overbuild for density unless it is?
Overbuild refers to the practice of placing additional asphalt mix on top of the required thickness to achieve the desired density. This practice is often used to compensate for inadequate compaction during initial placement or to address areas of low density.
In general, overbuild should not be used as a primary means of achieving density because it can result in pavement distresses such as rutting and cracking. Instead, efforts should be made to achieve the desired density during initial placement through proper mix design, compaction techniques, and equipment calibration.
If overbuild is used, it is important to test the density to ensure that the desired level is achieved. However, overbuild should only be tested for density if it is necessary due to the specific project requirements or conditions, such as extremely heavy traffic loads or other unusual factors.
Testing for density in overbuild situations can be challenging because the additional layer of asphalt can make it difficult to obtain accurate density measurements. Special techniques, such as nuclear density testing or coring, may be required to accurately measure the density of the overbuild layer.
In summary, overbuild should not be used as a primary means of achieving density, and testing for density in overbuild situations should only be done if it is necessary due to project requirements or conditions. It is important to carefully consider the potential risks and benefits of overbuild and select the appropriate compaction methods to achieve the desired density during initial placement.
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(300-6(D)) The provisions required for mounting conduits on indoor walls or in rooms that must be hosed down frequently is ______ between the mounting surface and the electrical equipment.
The provisions required for mounting conduits on indoor walls or in rooms that must be hosed down frequently is to provide adequate clearance between the mounting surface and the electrical equipment.
This is to ensure that the electrical equipment is not damaged or affected by any water or moisture that may be present during the cleaning process. The clearance should be sufficient to allow for easy cleaning access and should also prevent any water from penetrating the conduit or entering the equipment through any openings. Additionally, any mounting hardware or brackets used should be constructed from materials that are corrosion-resistant and can withstand exposure to water and cleaning chemicals. Proper installation of conduits in these environments is essential to ensure the safety and reliability of the electrical system.
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Question 78 Marks: 1 A special engineering study is required for slopes with an incline greater thanChoose one answer. a. 8 percent b. 6 degrees c. 8 degrees d. 4 percent
The correct answer is (b) 6 degrees. A special engineering study is required for slopes with an incline greater than 6 degrees, as stated in the International Building Code (IBC) section 1612.3.
In civil engineering and construction, a slope refers to an inclined surface or ground. Slopes can be found in a variety of natural and man-made environments, including hillsides, road embankments, building sites, and retaining walls. The slope of a surface is typically measured in terms of its angle of inclination or its gradient. The angle of inclination is expressed in degrees, while the gradient is expressed as a percentage or a ratio. For example, a slope with a 10% gradient rises 10 units for every 100 units of horizontal distance. Slopes can pose various challenges and hazards, including erosion, landslides, and instability. For this reason, proper design and construction techniques are necessary to ensure the safety and stability of slopes, especially those located near buildings, roads, or other infrastructure. Special engineering studies may be required for slopes with steep inclines or other potentially hazardous conditions. These studies typically involve detailed analysis and testing to evaluate factors such as soil composition, water content, and stability, and to determine appropriate design measures and safety precautions.
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The load for house electric clothes dryers in a dwelling unit(s) shall be ________ watts (volt-amps) or the nameplate rating, whichever is larger, for each dryer served. 220.54
The load for house electric clothes dryers in a dwelling unit(s) shall be 5000 watts (volt-amps) or the nameplate rating, whichever is larger, for each dryer served.
This requirement can be found in section 220.54 of the National Electric Code. It is important to note that the nameplate rating of the dryer should always be taken into consideration when determining the load, as it may vary depending on the specific model and manufacturer.
The load for house electric clothes dryers in a dwelling unit(s) shall be 5,000 watts (volt-amps) or the nameplate rating, whichever is larger, for each dryer served. This is according to the National Electrical Code (NEC) section 220.54.
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A data integrity problem will occur only if ________.A database has multiple administratorsData are duplicated in a databaseThe database is very complexThere are complex relationships between entities in a databaseThe database has too many keys
A data integrity problem will occur primarily when data are duplicated in a database.
Data integrity is the maintenance and assurance of data's accuracy and consistency over its entire lifecycle. When there is data duplication, it can lead to inconsistencies and incorrect information, which in turn negatively impacts the integrity of the database.
While having multiple administrators, a complex database, complex relationships between entities, and too many keys might pose management challenges, they are not the direct cause of data integrity problems. However, they can indirectly contribute to the issue if proper management practices are not followed.
In order to maintain data integrity, it is essential to implement measures such as data validation, normalization, and the use of primary keys to uniquely identify records. By doing so, it helps to minimize data duplication and ensures that the data remains consistent, accurate, and reliable throughout its lifecycle.
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a tsunami watch is issued by the pacific tsunami warning center when __________.
A tsunami watch is issued by the Pacific Tsunami Warning Center when a large earthquake occurs in the Pacific Ocean that has the potential to generate a tsunami. They detect an earthquake or other event that has the potential to generate a tsunami in the Pacific Ocean.
The watch is issued as a precautionary measure to alert coastal communities to the possibility of a tsunami and to encourage them to prepare for the worst-case scenario. The warning center monitors seismic activity and sea level readings to determine the likelihood of a tsunami and will issue a warning if there is a high probability of a tsunami reaching the coastline. It is important to take tsunami watches and warnings seriously and follow evacuation orders to ensure the safety of yourself and others.
The watch is issued to alert affected coastal regions and help them prepare for a possible tsunami, allowing residents and officials to take necessary precautions and monitor the situation closely.
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A tsunami watch is issued by the Pacific Tsunami Warning Center when there is a possibility of a tsunami occurring in the Pacific Ocean, usually due to an earthquake or other seismic event.
Tsunamis are massive waves that result from seismic activity or volcanic eruptions beneath the ocean. When formed in the open sea, the height of the waves remains relatively constant. However, as the waves approach the shore, they gather momentum and grow taller due to the decreasing depth of the water.
This watch serves as an early warning to coastal areas, allowing them to prepare for a potential tsunami.
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A _____ is a process that ensures an applicant possesses the skills needed for a particular job.
a. accreditation
b. diploma
c. certification
d. commendation
Answer:
c.certification
Explanation:
hope this helps!
Question 2B
book, do standards and protocols mean the same thing?
No, In the context of a book, the terms "standards" and "protocols" do not mean the same thing.
Standards refer to established guidelines or criteria that are used to measure quality and consistency, whereas protocols are a set of rules or procedures that govern how actions are performed or how information is communicated. Both terms are important in different aspects of a book, but they serve distinct purposes.
A standard is a set of guidelines or requirements that a product or service must meet in order to be considered acceptable or of high quality. On the other hand, a protocol is a specific set of rules or guidelines that are followed in order to achieve a certain outcome or goal. While both standards and protocols are important in various industries, they serve different purposes and should not be used interchangeably.So, the long answer is that although the terms "standards" and "protocols" may be used in similar contexts, they refer to different things and have distinct meanings.
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The collections framework algorithms are ___, i.e., each of these algorithms can operate on objects that offer given interfaces without concern to the underlying implementations
The collections framework algorithms are implementation-agnostic, i.e., each of these algorithms can operate on objects that offer given interfaces without concern to the underlying implementations.
This allows for flexibility and adaptability when working with different types of collections. The collections framework algorithms are interface-based, i.e., each of these algorithms can operate on objects that offer given interfaces without concern to the underlying implementations. This means that the algorithms are designed to work with any class that implements the required interface, regardless of how the class is implemented internally. This allows for greater flexibility and reusability of code within the collections framework.
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A host is accessing a Web server on a remote network. Which three functions are performed by intermediary network devices during this conversation? (Choose three.)
When a host is accessing a web server on a remote network, intermediary network devices perform these three functions:
Pscket forwardingAddressing and path determinationTraffic management and control
1. Packet forwarding: Devices like routers and switches forward packets of data between the host and the web server, ensuring that the data reaches its destination.
2. Addressing and path determination: Devices like routers use routing tables to determine the best path for data packets to travel between the host and the remote web server. They also translate IP addresses as needed, such as when using Network Address Translation (NAT).
3. Traffic management and control: Network devices like routers and switches manage and control data traffic by prioritizing packets and controlling congestion, ensuring that data is transmitted efficiently across the network.
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5202 - On a wing, the force of lift acts perpendicular to the relative wind and the force of drag acts parallel to the:- chord line-flightpath-longitudinal axis
On a wing, the force of lift acts perpendicular to the relative wind and the force of drag acts parallel to the flightpath. Option b is answer.
The chord line is an imaginary straight line that connects the leading edge to the trailing edge of the wing and the longitudinal axis is an imaginary line that runs through the center of the airplane from nose to tail. The force of lift is generated due to the difference in air pressure on the top and bottom surfaces of the wing, and it acts perpendicular to the relative wind, which is the direction of the airflow relative to the wing.
The force of drag, on the other hand, is generated due to the resistance of the air to the motion of the airplane through it, and it acts parallel to the flightpath of the airplane.
Option b is answer.
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TW can be described as thermoplastic insulation, suitable for dry or wet locations with a maximum operating temperature of 60 degrees C(True/False)
True. TW is a type of thermoplastic insulation that is suitable for use in both dry and wet locations. It has a maximum operating temperature of 60 degrees Celsius.
here is the list of several points to consider when choosing between thermoset and thermoplastic insulation:
Thermoset insulations have a higher tolerance to high temperatures compared to thermoplastic insulations. Thermoplastic insulations have a risk of heat deformation at inappropriately hot temperatures.
Thermoset insulations have superior flexibility, which they retain in cold temperatures. They stretch better than thermoplastic counterparts without the risk of breakage.
Thermoplastic materials are light in weight; therefore, thermoplastic insulations are a go-to when the weight matters. They can be put in very thin walls without negative consequences.
Thermoplastic insulations are easier to produce, which makes them cheaper than thermoset analogs.
Thermoplastic insulations are recyclable, while thermoset insulations cannot be recycled.
Thermoset insulations are quite hard and rigid, which can be a pro or a con depending on the particular electrical application.
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A frame is transmitted from one networking device to another. Why does the receiving device check the FCS field in the frame?
The receiving device checks the Frame Check Sequence (FCS) field in the frame to ensure that the frame has not been corrupted during transmission.
The FCS field contains a mathematical checksum that is calculated by the transmitting device before the frame is sent. When the frame is received, the receiving device recalculates the checksum and compares it to the value in the FCS field.
If the two values match, the frame is considered error-free and is accepted. If the values do not match, the receiving device assumes that the frame has been corrupted during transmission and discards it.
Therefore, the FCS field is an important mechanism for ensuring the reliability of data transmission in a network.
A frame is transmitted from one networking device to another in a networking environment.
The receiving device checks the FCS (Frame Check Sequence) field in the frame to ensure data integrity and detect any possible errors that may have occurred during the transmission process.
The FCS is a type of error-detection mechanism that helps maintain the reliability and accuracy of the data being transmitted between devices.
By checking the FCS field, the receiving device can verify if the received frame is error-free or corrupted, and take appropriate action, such as requesting retransmission or discarding the frame.
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5750 - Choose the correct statement regarding wake turbulence:- Vortex generation begins with the initiation of the takeoff roll- The primary hazard is loss of control because of induced roll- The greatest vortex strength is produced when the generating airplane is heavy, clean, and fast
The correct statement regarding wake turbulence is: "The primary hazard is loss of control because of induced roll." Wake turbulence, caused by vortex generation, can pose a hazard to other aircraft, especially during takeoff and landing.
The induced roll from the wake turbulence can make it difficult for pilots to maintain control of their airplane. Vortex generation begins at rotation and continues as the airplane gains altitude. The primary hazard of wake turbulence is a loss of control due to induced roll, which can occur if an airplane encounters wake turbulence from a larger or heavier airplane. It is important for pilots to be aware of this hazard and take appropriate measures to avoid encountering wake turbulence.
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Where does a asymmetric multiprocessing scheduler run?
An asymmetric multiprocessing scheduler typically runs on the operating system kernel of the primary processing unit.
This scheduler is responsible for distributing tasks to the different processing units in the system, which may have varying capabilities and resource availability. The scheduler must take into account the workload and capabilities of each processing unit in order to optimize system performance and ensure that tasks are completed efficiently. Overall, the goal of the asymmetric multiprocessing scheduler is to maximize the utilization of available resources while minimizing delays and bottlenecks in the system.
An asymmetric multiprocessing scheduler runs on the master processor in an asymmetric multiprocessing system. This type of scheduler is responsible for managing tasks and resources across multiple processors, with the master processor handling the scheduling and coordination, while the other processors execute the assigned tasks.
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A terminal that allows a server to enter guest orders but not settle guest accounts is called a __________ terminal.
A. cashier
B. precheck
C. "smart card"
D. self-service
A terminal that allows a server to enter guest orders but not settle guest accounts is called a A. cashier terminal. Other types of terminals that may be used in hospitality settings include precheck terminals.
A terminal is a device or computer that allows a user to access a server or network. In the context of hospitality or restaurants, a terminal can be used by servers to input guest orders into a point-of-sale (POS) system, which is typically managed by a server.
In this scenario, the terminal is restricted to only allowing servers to enter guest orders and is not authorized to settle guest accounts. This is known as a "cashier" terminal, as it is only used for inputting orders and not handling payments or cash transactions.
Other types of terminals that may be used in hospitality settings include precheck terminals, which allow guests to view menus and place orders before being seated, and self-service terminals, which allow guests to place orders and pay without assistance from a server.
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"A terminal that allows a server to enter guest orders but not settle guest accounts is called a __________ terminal."
Your answer: A terminal that allows a server to enter guest orders but not settle guest accounts is called a B. precheck terminal.
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352-10(F)) Rigid nonmetallic conduit can be installed exposed in buildings _____.
According to the National Electric Code (NEC) section 352-10(F), rigid nonmetallic conduit can be installed exposed in buildings where it is not subject to physical damage.
However, it is important to consult with local codes and damage before installing any electrical conduit to ensure compliance and safety.Rigid nonmetallic conduit (RNC) can be installed exposed in buildings when used in accordance with the National Electrical Code (NEC) Section 352-10(F). This section states that RNC is permitted for exposed work where it is not subject to physical damage, securely fastened, and properly supported.
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Einstein's general theory of relativity predicts that two orbiting neutron stars should radiate gravitational waves. How does the fact that the orbital period is getting shorter support this prediction?
The observed orbital decay provides strong support for the prediction that neutron star binaries radiate gravitational waves, as predicted by general relativity.
Einstein's general theory of relativity predicts that two orbiting neutron stars should radiate gravitational waves because the orbits should slowly lose energy in the form of these waves, causing the two stars to gradually spiral closer together. As the neutron stars move closer together, their orbital period should decrease. This is because the gravitational force between the two stars is proportional to the inverse square of the distance between them, so as they get closer, the force becomes stronger and they move faster. Observations of neutron star binaries have indeed shown that their orbital periods are decreasing over time, in a manner consistent with the predictions of general relativity. This decrease in orbital period is known as "orbital decay" and it has been measured very precisely using techniques such as pulsar timing.
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