per pole QUESTION SEVEN A 3HP, 3-phase induction motor with full load efficiency and power factor of 0.83 and 0.8 respectively has a short-circuit current of 3.5 times the full current. Estimate the line current at the instant of starting the motor from a 500% supply by means of star-delta switch. Ignore the magnetising current.

Answer:

A rectifier is an electrical device used to convert alternating current to direct current.

Explanation:

Hope this helps! Shalom

Answer:

A catalytic converter is expensive because it needs rhodium to reduce smog levels. Rhodium, at its current value, is extremely expensive which makes using it in a catalytic converter expensive. To make up for their cost, manufacturers have to increase the price of the catalytic converter.

Explanation:

The rate of heat transfer by the air conditioner using constant specific heat of 1.004kj/kg.K is 15.06 kW.

Rate of heat transfer is the power rating of the machine.

Work done and changes in potential and kinetic energy are neglected since it is a steady state process.

The specific heat in terms of specific heat capacity and temperature change is given as:

\(q_{out} = Cp(Ti - Te)\)

\(q_{out} = 1.004(30 - 10) = 20.08 kJ/kg \\ \)

The rate of heat transfer, is then determined as follows:

Qout = 0.75 × 20.08 = 15.06 kW

Therefore, the rate of heat transfer by the air conditioner is 15.06 kW.

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Answer:

please give me brainlist and follow

Explanation:

Example of an irreverseble isothermal process is mixing of two fluids on the same temperature - it requires a lot of energy to unmix Jack and coke. ... Example of an reversible process with changing temperature is isentropic expansion.

According to the question, an isothermal heat-transfer process can be either reversible or irreversible depending on the nature and characteristics of the closed system.

An isothermal process may be defined as a type of thermodynamic process in which the specific temperature of a system always remains constant. This means that ΔT = 0. In this thermodynamic process, the temperature of the whole system remains constant over a period of time.

An example of an isothermal process necessarily internally reversible may definitely include the working process of a radiator that involves the heating of the room while having a constant temperature is an irreversible isothermal process. An example of a reversible process with changing temperature is isentropic expansion.

Therefore, according to the question, an isothermal heat-transfer process can be either reversible or irreversible depending on the nature and characteristics of the closed system.

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Answer:

a. myMethod() has access to and can use myField.

Explanation:

Logic programming is a kind of programming which is largely based on formal logic.  The statement are written in logical forms which express rules about the domain. In the given scenario the my method will have access to my field which is private field. My method non static public field can also use my field class.

Answer:

Objects that float on water have densities less than the density of water; those that do not float on water have densisties greater than the density of water:

Float on water:  d < 0.0361 lb/in³ (where d denotes denisity)

Do not float on water:  d > 0.0361 lb/in³

Explanation:

I don't know if this works for it or not?

Answer:

Most technicians install rebuilt or new power steering pumps rather than overhauling the defective unit in the shop.

True

Explanation:

It has been established that most technicians, instead of overhauling the defective power steering pumps, prefer to install rebuilt or revamped pumps or even new pumps when they could have overhauled the unit themselves.  Some are afraid that leakage could occur again.  They are not confident enough to do the overhauling in-house or some claim that they do not have the time and other tools to carry out the overhauling.  Acknowledgedly, overhauling a power steering pump is not a job for the novice.  They require experienced and skilled hands to do the hard work.

The purpose behind the use of control charts is to distinguish between common cause variation and special cause variation in a process.

Common cause variation is a natural part of any process and is caused by random fluctuations in the system. Special cause variation, on the other hand, is caused by a specific event or factor that can be identified and addressed. Control charts help to monitor a process over time, by plotting data points on a graph, and determining if they fall within the expected range of variation.

If the data falls within the expected range, then the process is considered to be under control. If the data falls outside of the expected range, then there may be a special cause present that requires investigation and corrective action, control charts help to identify and distinguish between common cause and special cause variation, allowing for continuous improvement and quality control in a process.

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The outer shell of structural firefighting protective clothing is typically made from flame-resistant materials such as Nomex and Kevlar. These materials are chosen for their ability to withstand high temperatures and provide protection against flames and heat.

The outer shell of structural firefighting protective clothing plays a crucial role in shielding firefighters from the hazards they encounter during firefighting operations. It is designed to provide flame resistance, durability, and thermal protection. Nomex and Kevlar are two commonly used materials for constructing the outer shell of firefighting gear. Nomex is a flame-resistant aramid fiber that possesses excellent thermal stability. It can withstand high temperatures without melting or dripping, providing a critical layer of protection for firefighters. Nomex fibers are known for their resistance to heat and flame, making them ideal for use in firefighting garments. Kevlar, another aramid fiber, is known for its exceptional strength and heat resistance. It is widely used in various applications that require high-performance protection, including firefighting protective clothing. Kevlar fibers have excellent flame resistance and are capable of maintaining their structural integrity even in extreme heat conditions. By using materials like Nomex and Kevlar in the outer shell, structural firefighting protective clothing can withstand the intense heat and flames encountered during firefighting operations. These flame-resistant materials provide a crucial barrier between firefighters and the hazardous environment, helping to minimize the risk of burns and injuries.

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Answer:

It should be within 10%

Explanation:

Cranking compression is simply the pressure that builds up inside cylinders when the valves are closed and the piston then moves up the bores to lead to compression of the mixture.

Cranking compression is normally measured in pounds per square inch (PSI).

When checking cranking compression, we should be looking for signs of replication between cylinders. It means that each cylinder should build pressure within about 5 percent of the others under the same number of starter revolutions. Thus, the variation between the highest and lowest readings should not be more than 10%

Answer:

building?

Explanation:

Answer:

This is not a clear indication of the hot zone as the information of the radioactivity of the background is not provided clearly.

Explanation:

According to IAEA as well as NRCP, the hot area is defined on the basis of the radioactivity reading it shows instead of contrast or comparative reading from the background. The value of radiation activity which will be required to declare an area as hot zone is if it is greater than 0.1 mSv/h or \(1.5091\times 10^{29} kg^{-1} s^{-1}\).

Explanation:

Dempwolf created by John Augustus, Among the most prominent innovative solutions in Southern California Pennsylvania was established by Dempwolf with  brother Reinhardt or uncle's son Frederick entered the company of J.A. Dozens of structures in 10 states were engineered by Dempwolf.

Answer: Problem Statement

Explanation:

When going about designing a new product or an improvement to an existing product, it is important to state the problem in a clear and concise way so that the designers know precisely what they are working towards.

This is where a Problem statement comes in. It states the problem in a concise manner and juxtaposes the current shortcomings of the current system against what the system should ideally be in such a way that even though the solution is clear, it is not so precise that it makes the designers narrow-minded.

Explanation:

The logic is captured in the Karnaugh map of the first attachment. M and D refer to Mom and Dad, respectively, and A and B refer to the children. A logic 1 is a vote for Chicken, 0 is a vote for Hamburger.

The logic in attachment 2 shows an implementation using And and Or gates. The effective equation is ...

  chicken = (m·d) + (m+d)·(a+b)

The logic in attachment 3 shows an implementation using an 8-input selector. The dots at the inputs represent inversion, so those inputs to the selector represent a logic 1 (chicken).

Answer:  The answer is rockmetamorphic rock → igneous rock → sedimentary rockigneous rock

Explanation: Hope this was helpful

An illustration of elastic behavior is the elastic rebound brought on by earthquakes.

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The temperature at which the diffusion coefficient have a value of 2.1×10-5 m 2 /s is  -47078 K.

Using the relation;

logD = logDo - Ea/2.303RT

D = diffusion coefficient

Do =  preexponential

Ea = activation energy

R = gas constant

T = temperature

Substituting values;

log(2.1×10-5)= log (1.1×10-5 ) - 253,300/2.303 × 8.314 × T

log(2.1×10-5) -  log (1.1×10-5 ) =  - 253,300/2.303 × 8.314 × T

log[2.1×10-5/1.1×10-5] = - 253,300/2.303 × 8.314 × T

0.281 × (2.303 × 8.314 × T) = - 253,300

T =  - 253,300/2.303 × 0.281 × 8.314

T = -47078 K

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Answer:

pocket cut

Explanation:

type of adjustable square that can be used to set test and transfer angles. sliding t bevel.

The stage of saddle fusion that is completed when you remove the heater plate face and visually inspect the heated ends, then join the fitting and pipe is the "heating and fusing" stage.

During the heating and fusing stage of saddle fusion, the heater plate is placed between the ends of the fitting and pipe, and they are heated to their melting point. Once the ends are heated, the heater plate is removed, and the ends are visually inspected to ensure that they have melted and are ready for joining.

After the ends have been inspected, the fitting and pipe are joined together by applying pressure to the molten plastic and holding them in place until the plastic cools and solidifies. This completes the heating and fusing stage of the saddle fusion process.

It is important to note that proper technique and equipment are crucial during this stage to ensure a strong, leak-free joint. Improper heating or fusing can result in a weak or defective joint, which can lead to leaks, contamination, or other problems. Therefore, it is essential to follow established procedures and use appropriate equipment when performing saddle fusion.

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The most common type of work holding device for a milling machine is the vise. A milling machine vise is a mechanical device that holds the workpiece firmly in place during machining operations.

It is a rugged and robust device that is designed to withstand the forces generated during milling operations. Milling machine vises come in various sizes and configurations to accommodate different workpiece sizes and shapes. They are typically made of cast iron or steel and feature adjustable jaws that can be tightened to hold the workpiece securely in place.

Other types of work holding devices for milling machines include clamps, bolts, and straps. However, the vise remains the most commonly used type of work holding device due to its versatility, ease of use, and reliability. When selecting a milling machine vise, it is important to choose one that is compatible with the size and capacity of your milling machine.

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Answer:

Solvents can damage certain plastics and rubbers found in the engine

Explanation:

Answer:

The answer is below

Explanation:

The mining auxiliary operations in underground mining involve various activities that are important for a successful mining operation particularly in the areas of productive operating conditions.

The activities involved in the auxiliary operations in underground mining include the following: ventilation, haulage, drainage, power supply, lighting, delivery of compressed air, water, supplies to the working sections, and communications.

Answer:

Scheduling is a process of create a structure that shows the way a schedule is organized before developing a complete and final schedule of a project.

Explanation:

This is the initial step in of developing a project schedule for a capital cost project. At this stage, the estimates for the project are done involving the various actions in the project. A lot of details are included in this  schedule showing the activities that are to be performed and the constraints involved.

Solution :

It is given that :

Thermal coefficient = 0.0045/K

Ambient temperature, \($T_a = 25 - 40^\circ$\)

air velocity, v = 0-5 m/s

Solar radiation, \($G= 400-100 \ W/m^2$\)

\($P=50 \ W$\)

Model calculations :

Cell temperature (\($T_c$\))

\($T_c = T_a + \left(\frac{0.25}{5.7+3.8 \ v_w}\right) G$\)

where \($ v_w - v_a = $\) wind speed / air speed

∴ \($T_c = 2 \pi + \left(\frac{0.25}{5.7+3.8 \times 1}\right) \times 400$\)

   \($T_c = 35.526 ^\circ$\)

\($\Delta T = T_c -25$\)

      = 35.526 - 25

      = 10.526 K

Thermal coefficient = 0.0045 x 10.526

                                = 0.04737

Pv power = \($(1 -C_T) \times P \times \frac{G}{1000}$\)

                \($=(1 -0.04737) \times 50 \times \frac{400}{1000}$\)

                = 17.0526 W

At 1.2mpa pressure and 50c

What is pressure?
By pressing a knife against some fruit, one can see a straightforward illustration of pressure. The surface won't be cut if you press the flat part of the knife against the fruit. The force is dispersed over a wide area (low pressure).

a)Mass flow rate of the refrigerant
Therefore h1= condenser inlet enthalpy =278.28KJ/Kg
saturation temperature at 1.2mpa is 46.29C
Therefore the temperature of the condenser

T2 = 46.29C - 5
T2 = 41.29C

Now,
d)power consumed by compressor W = 3.3KW
Q4 = QL + w = Q4
QL = mR(h1-h2)-W
= 0.0498 x (278.26 - 110.19)-3.3
=5.074KW
Hence refrigerator load is 5.74Kg

(COP)r = 238/53
(Cop) = 4.490

Therefore the above values are the (a) mass flow rate of the refrigerant, b) the refrigerant load, c) the cop, and d) the minimum power input to the compressor for the same refrigeration load.

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Answer:

See attachment for chart

Explanation:

The IPO chart implements he following algorithm

The expressions in bracket are typical examples

Input

Input Number (5, 4.2 or -1.2) --- This will be passed to the Processing module

Processing

Assign variable to the input number (x)

Calculate the square (x = 5 * 5)

Display the result (25) ----> This will be passed to the output module

Output

Display 25

Excitons play a crucial role in silicon solar cells and are involved in several processes that contribute to the generation of electricity. Here are some key roles of excitons in silicon solar cells:

1. Absorption of Photons: When photons from sunlight strike the silicon material of a solar cell, they can be absorbed by silicon atoms, promoting an electron from the valence band to the conduction band. This process creates an exciton—a bound electron-hole pair.

2. Exciton Diffusion: After absorption, excitons can diffuse through the silicon material, moving towards the region of the solar cell where charge separation occurs. This diffusion process allows excitons to reach the vicinity of the p-n junction, where the separation of charges takes place.

3. Exciton Dissociation: At the p-n junction of a silicon solar cell, excitons can undergo dissociation. The electric field created by the junction separates the electron and hole of the exciton, allowing them to move freely in opposite directions as charge carriers.

4. Electron and Hole Transport: Once the exciton is dissociated, the free electron and hole can move independently within the solar cell. They are transported through the silicon material to the respective electrodes, creating an electric current that can be harnessed for external use.

5. Recombination: Excitons can also undergo recombination, where the electron and hole recombine, releasing energy in the form of light or heat. Recombination is undesirable in solar cells as it reduces the overall efficiency of the device.

To enhance the efficiency of silicon solar cells, various strategies are employed to minimize exciton recombination and improve exciton dissociation and charge carrier transport. These include the use of anti-reflection coatings, surface passivation techniques, and optimization of the device structure.

Overall, excitons play a vital role in the absorption and conversion of sunlight into electrical energy in silicon solar cells. Understanding and controlling exciton dynamics are essential for improving the performance of solar cells and advancing the field of photovoltaics.

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