(a) A 3-phase, 15kW, 400V, 50Hz, 6-pole, delta connected squirrel cage induction motor has a full-load efficiency of 89%, power factor of 0.87 lagging, and running speed of 970 rpm. Calculate the following for full-load conditions; (i) Input power (VA) (3 Marks) (ii) Supply Line current (3 Marks) (iii) Phase current (3 Marks) (iv) Full-load torque (3 Marks) (b) A three phase induction motor has winding impedances of 20Ω. The motor terminal box contains six terminals, two for each winding. Explain how the starting line currents of this motor can be reduced and calculate these line currents when the motor is powered using 400V 50Hz three phase supply. Assume line currents are determined only by the winding impedance value

Answer:

1) The bending moment diagram of the shaft is shown in Figure 1. The weakest cross section A is located at the point where the bending moment is maximum.

2) The weakest point on cross section A is located at the point where the bending moment is maximum.

3) The von-Mises stress at the weakest point is given by:

σ = M/I

where M is the bending moment and I is the moment of inertia of the cross section.

4) The factor of safety n is given by:

n = Sy/σ

where Sy is the yield strength of the shaft and σ is the von-Mises stress at the weakest point.

Explanation:

Hope this helps!

The magnitude of σ1 that will cause yielding according to the maximum-shear-stress theory is 9.94 ksi.

Yield stress for the zirconium-magnesium alloy, σY = 15.3 ksi

In-plane principal stresses are σ1 and σ2 = −0.54σ1

To find the maximum shear stress theory, the equation used is τ_max=1/2(σ1-σ2)

The maximum shear stress theory states that yielding begins when the maximum shear stress in a part equals or exceeds the shear strength of the material. It is represented as τ_max = τ_yield

Where τ_max is the maximum shear stress in a part and τ_yield is the shear strength of the material. In-plane principal stresses are σ1 and σ2 = −0.54σ1

Let us replace the value of σ2 in terms of σ1σ2 = −0.54σ1,σ1 = 1.85σ2

Substitute the values in the τ_max=1/2(σ1-σ2)

τ_max=1/2(σ1-(-0.54σ1))

τ_max=0.77σ1

Now, τ_yield= σY/2 = 7.65 ksi

Therefore, 0.77σ1 = 7.65

σ1 = 9.94 ksi

You can learn more about magnitude at: brainly.com/question/31022175

#SPJ11

Control of certain diseases is possible by controlling reservoir animals. Reservoir animals are those that carry and spread disease-causing organisms.

Control vector animals: Vector animals are those that transmit diseases from one host to another, such as mosquitoes or ticks. Controlling their populations or preventing their contact with humans can also help reduce disease transmission, but this approach is more effective for diseases that are spread directly by vectors rather than through intermediate hosts or the environment.

Control vector animals: Vector animals are organisms that transmit diseases between humans or from animals to humans. By controlling their population and spread, we can reduce the transmission of diseases.

To know more about Reservoir animals visit:-

https://brainly.com/question/19490669

#SPJ11

The definition of a rural area according to China and Europe is: one in which more than half of the population resides in rural grid cells, as measured by the degree of urbanization.

A rural area, sometimes known as the countryside, is a geographical area located outside of towns and cities.

Rural areas often have a low population density and tiny communities. Agricultural and forestry regions are sometimes referred to as rural.

Cities, suburbs, and towns are all examples of urban environments. Villages are sometimes referred to as rural places.

Cities have seen increased growth in terms of infrastructure and connectivity, such as airports, ports, railroads, housing, and roadways. Infrastructure development in rural regions is typically limited.

Learn more about rural areas:
https://brainly.com/question/13547914
#SPJ1

Answer: 162.4

Sorry if you get it wrong :(

Explanation:

New, derived traits of human evolution over the past five million years include all of the following except: elongation. The correct answer to the given question is option D .

Derived traits are new traits that have been passed down to a given organism by their ancestors. Some of the derived traits of human evolution over the past five million years include:

Encephalization: Encephalization is the evolutionary trend of brain size increasing relative to body size over geological time in a lineage. This evolutionary trend was observed in the human lineage.

Lack of body hair: One of the derived traits of human evolution is the lack of body hair. Humans have a far less dense body hair than other apes and primates. The loss of body hair facilitated an increase in sweat gland density, which helps us regulate our body temperature.

Reduced sexual dimorphism: The reduced differences between the sexes in size and appearance over time in a given population is referred to as reduced sexual dimorphism.

Elongation: Elongation is not a derived trait of human evolution over the past five million years, so it is the correct answer.

For more such questions on human evolution, click on:

#SPJ8

The true power is obtained as 70.7 VA.

We define the power a the rate of doing work, we know that the power in a circuit is the product of the current and the voltage. In this case, we want to find the true power thus we have to involve the use of the phase shift in degrees.

Thus;

True power = PcosΦ

P =  100 VA

Φ = 45 degrees

True power =  100 VA * cos 45 degrees

True power = 70.7 VA

Learn more about power in a circuit:https://brainly.com/question/2933971

#SPJ1

Answer:

The correct response is "821.88". A further explanation is given below.

Explanation:

According to the question,

The largest amount unresolved after five years would have been:

= \(35000\times (\frac{F}{P}, 4 \ percent,5 )\)

= \(35000\times 1.216 7\)

= \(42584.50\)

Now,

time (t) will be:

= \(5\times 12\)

= \(60 \ monthly \ payments\)

So, monthly payment will be:

= \(42582.85\times (\frac{A}{P}, 0.5 \ percent,60 )\)

= \(42584.50\times 0.0193\)

= \(821.88\)

When using a decision matrix, weights are determined for each criterion to quantify their relative importance in the decision-making process.

In a decision matrix, weights are assigned to each criterion to reflect their significance in the decision-making process. The purpose of assigning weights is to quantify the relative importance of each criterion in relation to the others. The process of determining weights involves evaluating the impact or influence of each criterion on the overall objective or outcome of the decision.

To assign weights, decision-makers often engage in a collaborative process where they assess and discuss the criteria based on their relevance and importance. This can be done through expert opinions, surveys, or data analysis, depending on the nature of the decision. The assigned weights are typically expressed as percentages or numerical values, reflecting the proportionate significance of each criterion.

Learn more about decision matrix

brainly.com/question/30629177

#SPJ11

Answer:

a pneumatic or electric power

Explanation:

The primary energy source for the controller in a typical control system is either "a pneumatic or electric power."

This is because a typical control system has majorly four elements which include the following:

1. Sensor: this calculates the controlled variable

2. Controller: this receives and process inputs from the sensor to the controlled device as output

3. Controlled device: this tweak the controlled variable

4. Source of energy: this is the energy used to power the control system. It could be a pneumatic or electric power

Answer:

Forces like wind and water break down rocks through the processes of weathering and erosion. ... Forces like wind and water move the rock pieces. They mix with matter like sand to become sediment. Weathering and erosion help shape Earth's surface.

Answer:

As an agent of erosion, the wind will quickly break the rock into different rock types.

Explanation:

The given statement "A binary half adder, adds 3 bits and produces sum and carry" is false because a digital circuit, a half adder can only add two bits and produce a sum and a carry output.

A binary half adder is a digital circuit that adds two binary digits (bits) together and produces a sum and a carry output. It operates on only two inputs and produces two outputs, one for the sum and one for the carry. It is a fundamental building block in digital circuits and is used in many applications such as arithmetic operations and data processing.

A half adder is a basic digital circuit used in many applications such as data processing, arithmetic operations, and memory devices. It is a combinational logic circuit that adds two single-bit binary numbers and produces a sum bit and a carry bit. The half adder has two input ports, one for each binary digit to be added, labeled as A and B, and two output ports, labeled as S (sum) and C (carry).

However, a half adder cannot add three bits. It can only add two bits together. To add three bits together, a full adder is required, which has three inputs and produces two outputs for the sum and the carry.

So, the statement "binary half adder adds 3 bits and produces sum and carry" is false. A half adder can only add two bits and produce a sum and a carry output.

Learn more about digital circuit here:

https://brainly.com/question/31424422

#SPJ11

Answer:

Lack of fluid oil – lack of fluid oil in your vehicle, or a fluid leakage, can lead to heavy steering. If there is a lack of fluid oil, or a leak, this can reduce the pressure in the system, meaning the steering wheel does not receive enough supply of fluid to perform freely.

Information systems enable users to connect and process data to help with management decision making. Information systems (d) consist of software, hardware, data, people, and procedures working together to support the efficient and effective management of an organization.

These systems collect, store, analyze, and distribute information, allowing managers to make well-informed decisions based on reliable and up-to-date data.

While expert systems (a) and knowledge management systems (c) are specialized subsets of information systems that focus on specific domains of knowledge or expertise, they do not encompass the broader scope of data processing and connection that information systems provide. Similarly, information technologies (b) refer to the technological components used within information systems, but do not include the human and procedural aspects that are vital for decision-making. Decision-making tools (e) are applications or techniques used to analyze data and make decisions, but they do not offer the comprehensive integration of hardware, software, data, people, and procedures that information systems provide.

In conclusion, information systems are the most suitable choice for enabling users to connect and process data for management decision-making purposes, as they encompass all the necessary components to efficiently collect, store, analyze, and distribute information.

Learn more about hardware here:-

https://brainly.com/question/15232088

#SPJ11

A reciprocating engine automatic mixture control responds to changes in air density caused by changes in altitude or temperature.

An engine that uses one or more pistons to transfer pressure into rotational motion is referred to as a reciprocating engine. They convert this energy using the pistons' reciprocating (up and down) action.

A calibrated needle, seat, and bellows assembly make up the automatic mixture control device.The automatic mixture control is used to account for variations in air density brought on by changes in temperature and altitude.

Learn more about temperature at;

https://brainly.com/question/25677592

#SPJ4

Micropulse arc welding is a well-known tool for speeding up simple bench operations during the welding process like ring size, making connections near thermally sensitive gemstones, and mending porosity castings.

The practice performs effectively on gold, silver, copper, and stainless steel whether joining tiny jewelry materials or bigger pieces for miniature metal sculptures.

The welding arc temperatures typically range from 6000°C to 8000°C, which translates to about 10000F to 15000F.

This increased range of thermal heat is high enough to turn Gold and silver rings into a molten state. A molten state is a phase at which a solid element is being melted and turns into a liquid state under the influence of a high temperature.

Therefore, from the above explanation, we can conclude that it is possible and true for gold and silver rings to receive an arc and turn molten.

Learn more about arc welding here:

https://brainly.com/question/3810317?referrer=searchResults

An example of a visual or graphic representation of information that has more impact than an explanation of the information in text is a pie chart (graph).

A graph can be defined as a type of chart that's commonly used to graphically represent data on both the horizontal and vertical lines of a cartesian coordinate, which are the x-axis and y-axis.

In Science, there are different types of graph and these include the following:

A pie chart can be defined as a type of graph that is typically used for the graphical representation of the relationship between each part (unit) to a whole, especially by dividing a circle into various sectors.

In this context, we can reasonably infer and logically deduce that an example of a visual or graphic representation of information that has more impact than an explanation of the information in text is a pie chart (graph).

Read more on graphs here: https://brainly.com/question/25875680

#SPJ1

An environmental hazard is a substance, state or event which has the potential to threaten the surrounding natural environment and/or adversely affect human's health. This term incorporates topics like pollution, natural disasters and human-made hazards. Health studies investigate the human health effects of exposure to environmental hazards ranging from chemical pollutants to natural, technological or terrorist disasters. The environment in which we live can be considered as having three fundamental sets of components, physical, chemical, biological. Associations between an exposure and an adverse health effect do not, on their own, prove that the former is the cause of the latter. Many other non-causal associations could explain the findings. Physical hazards involve environmental hazards that can cause harm with or without contact. Examples are earthquakes, electromagnetic fields, floods, light pollution, noise pollution, vibration, x-rays etc. Radioactivity is associated with an exposure dependent risk of some cancers notably leukaemia. The scientific evidence of adverse health effects from general environmental exposure to these fields is "not proven". If there are adverse effects yet to be proven, the risk is probably likely to be small. Chemical substances cause significant damage to the environment. Tobacco smoke is the single biggest known airborne chemical risk to health, whether measured in terms of death rates or ill-health. To a much lesser degree of risk, these adverse effects apply to non-smokers exposed passively to sidestream tobacco smoke. Health effects of concern are asthma, bronchitis, lung cancer and similar lung diseases, and there is good evidence relating an increased risk of symptoms of these diseases with increasing concentration of Sulphur dioxide, ozone and other pollutants. Biohazards generally fall into two broad categories: those which produce adverse health effects through infection (microorganisms, viruses or toxins) and those which produce adverse effects in non-infective (allergic) ways.

Hope this helps...:)

Answer: 2nd Student (Ceramic student)

Explanation: Ceramic is reliable for fuses more than the paragraph in this states they are. Hence it would be the 2nd student who is wrong.

To solve the initial value problem for the linear model for velocity v(rho) = v max (1 - rho / rho max), where cars can merge from the on-ramp onto the main road anywhere in the merger zone 0 <= x <= rho max / 2, and the traffic on the main road has uniform density rho max / 2 and no other cars merge onto the main road in the future, we can use the conservation law.

The conservation law states that if we consider a road segment [x1, x2], then the change in the number of cars on the segment is equal to the difference between the number of cars entering the segment and the number of cars leaving the segment. Therefore, d N/d t = a(x, t) - a(x + delta x, t) - v(rho)(rho(x, t)) + v(rho)(rho(x + delta x, t)), where delta x is the length of the road segment [x, x + delta x].

We will consider two cases,  (i) x1 and x2 are away from the merging zone, and (ii) x1 and x2 are within the merging zone. In case (i), a(x, t) = a(x + delta x, t) = 0, since no cars are merging onto the main road in the future and all cars are already on the main road. Therefore, we get d N/d t = - v(rho)(rho(x, t)) + v(rho)(rho(x + delta x, t)).

Know more about conservation law:

https://brainly.com/question/20635180

#SPJ11

Two technicians are discussing solder repair. Technician A says that solder should be applied to the soldering iron tip while soldering Technician B says that the solder should be applied to the wire joint while soldering. The correction technician is: "Both Technician A and B (Option C)

Soldering is a joining method that uses solder to bind several metals together. Solder is a metal alloy typically composed of tin and lead that is melted using a hot iron.

The iron is heated to a temperature above 600 degrees Fahrenheit before cooling to form a strong electrical connection. To put it another way, soldering is the process of uniting metal pieces to produce a mechanical or electrical link.

It commonly employs a low melting point metal alloy (solder), which is heated and applied to the metal pieces to be connected, and when the solder solidifies, it attaches to the metal parts and makes a connection.

Learn more about soldering:
https://brainly.com/question/28555395

#SPJ1

Full Question:

Two technicians are discussing solder repair. Technician A says that solder should be applied to the soldering iron tip while soldering Technician B says that the solder should be applied to the wire joint while soldering. Who is Correct?

a) The given statement "f is a smooth function, then curl(gradf) = 0 i 0 j 0 k" is false because a scalar function f, these partial derivatives are identically zero, and thus the curl of grad(f) is zero in all three directions: curl(grad(f)) = 0i + 0j + 0k.

B) The given statement "  if g is a smooth curl field, then divg = 0 " is true because the curl of g is zero, it follows that the flux of g* through any closed surface is also zero

a) False. If f is a smooth function, then grad(f) is a vector field given by the partial derivatives of f with respect to each coordinate direction. The curl of grad(f) is given by the cross product of the vector differential operator del with grad(f). This operation can be computed using the formal definition of the curl, which involves taking the partial derivatives of each component of grad(f) with respect to the remaining two components. For a scalar function f, these partial derivatives are identically zero, and thus the curl of grad(f) is zero in all three directions: curl(grad(f)) = 0i + 0j + 0k.

b) If g is a smooth curl field, then it is a vector field whose curl is zero: curl(g) = 0. This means that any closed loop in the vector field will have zero circulation. Using Stokes' theorem, we can relate the curl of g to the divergence of its dual vector field, which we denote by g*. Specifically, Stokes' theorem states that the circulation of a vector field around a closed loop is equal to the flux of its dual field through the surface enclosed by the loop. In the case of a curl field, the dual field is given by the cross product of g with the unit normal vector to the surface. Since the curl of g is zero, it follows that the flux of g* through any closed surface is also zero. By the divergence theorem, this implies that the divergence of g is also zero: div(g) = 0. Therefore, the statement is true.

Know more about divergence theorem here:

https://brainly.com/question/30029376

#SPJ11

Screws that join clothes dryer exhaust ducts may protrude a maximum of 1/8 inch into the inside of the duct.

When connecting clothes dryer exhaust ducts, it is essential to ensure proper installation to maintain efficient airflow and minimize potential hazards. Screws used to join these ducts should not extend more than 1/8 inch into the inside of the duct.

This limit helps prevent lint buildup, which can lead to clogs, reduced airflow, and potential fire hazards. By adhering to this guideline, the risk of lint accumulation and blockages is minimized, promoting safer and more efficient dryer operation.

Learn more about Clothes dryer

brainly.com/question/13841768

#SPJ11

Answer:

Shelf life.

Explanation:

In Business, an inventory is a term used to describe a list of finished goods, goods still in the production line and raw materials that would be used for the manufacturing of more goods in a bid to meet the unending consumer demands.

Simply stated, an inventory can be classified into three (3) main categories; finished goods, work in progress, and raw materials.

An inventory is recorded as a current asset on the balance sheet because it's primarily the most important source of revenue for a business entity.

Also, the three (3) main cost concept associated with an inventory are;

1. First In First Out (FIFO).

2. Last In First Out (LIFO).

3. Weighted average cost.

Shelf life can be defined as a measure of the length of time that a particular product could be kept or stored without it getting bad or becoming unsuitable for use by the consumers. Thus, the shelf life of a product is largely dependent on its expiration date.

Hence, merchandise without an expiration date like electronics, tools and home goods typically have a longer shelf life.

To calculate the total wellbore storage coefficient and the dimensionless wellbore storage coefficient,  it is necessary to obtain more details about the compressibility of the fluid and the fluctuations in fluid level observed during the drawdown experiment.

The wellbore's storage coefficient reflects the variation in fluid quantity resulting from a unit of pressure change in the same area. The subsequent equation can be utilized to compute it:

Wellbore Storage Coefficient (C) = (Change in Fluid Volume) / (Change in Pressure)

To estimate the wellbore storage coefficient without having the specific values of the oil formation volume factor (Bo) for a particular reservoir, we divide the wellbore storage coefficient by Bo.

Learn more about total wellbore storage coefficient from

https://brainly.com/question/14685207

#SPJ4

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.

Answer:

On wht!?!?!?!

Explanation:

A change in ambient temperature or air density can have a significant effect on gas turbine engine performance. These factors influence the engine's efficiency, power output, and fuel consumption.

1)Firstly, an increase in ambient temperature causes a decrease in air density. As air density decreases, the mass of air entering the engine per unit time (mass flow rate) also decreases. This leads to a reduction in the engine's power output since less air is available for combustion with fuel. Conversely, a decrease in ambient temperature increases air density, resulting in a higher mass flow rate and increased power output.

2)Secondly, a change in ambient temperature affects the engine's thermal efficiency. Higher temperatures cause an increase in the temperature difference between the inlet air and the hot gases exiting the combustion chamber, which can lead to decreased thermal efficiency. Lower ambient temperatures, on the other hand, increase thermal efficiency as the temperature difference is greater.

3)Lastly, variations in air density can also affect fuel consumption. When air density is low, the engine requires more fuel to maintain a specific power output, leading to increased fuel consumption. Conversely, higher air density allows the engine to achieve the desired power output with less fuel, resulting in improved fuel efficiency.

4)In conclusion, changes in ambient temperature and air density significantly impact gas turbine engine performance by influencing power output, thermal efficiency, and fuel consumption. Understanding these effects is crucial for optimal engine operation and management.

For such more question on power output

https://brainly.com/question/29746696

#SPJ11

Answer:

  110 m

Explanation:

The geometry of the problem can be modeled by a right triangle. The height of the cliff forms one leg, and the distance to a buoy forms the other leg. The angle of depression is opposite the height of the cliff. An appropriate trig relation is ...

  Tan = Opposite/Adjacent

Solving for the Adjacent side (the distance to the buoy), we find ...

  Adjacent = Opposite/Tan

  distance to buoy 1 = (80 m)/tan(23°) ≈ 188.468 m

  distance to buoy 2 = (80 m)/tan(15°) ≈ 298.564 m

Then the distance between the buoys is ...

  298.564 -188.468 m ≈ 110 m

The buoys are about 110 meters apart.

Answer:

sorry di ko alam

Explanation: