Question 2 [4] A 4-pole DC machine, having wave-wound armature winding has 55 slots, each slot containing 19 conductors. What will be the voltage generated in the machine when driven at 1500 r/min assuming the flux per pole is 3 mWb? (4) Final answer Page Acro

Answers

Answer 1

The voltage generated in the machine when driven at 1500 rpm is approximately 1631.2 V.Answer: 1631.2 V.

The emf induced in a DC machine is given by the formula;E = 2πfTφZN / 60AVoltsWhere;f = Frequency of armature rotation in Hz = P × (n / 60)Where;P = Number of polesn = Speed of armature rotation in rpmT = Number of turns per coilZ = Number of slotsA = Number of parallel pathsφ = Flux per pole in WbN = Number of conductors in series per parallel pathE = 2 × 3.14 × f × T × φ × Z × N / A × 60But T × Z / A = N (Number of conductors per parallel path)Therefore, E = 2 × 3.14 × f × φ × N² / 60For the given 4-pole DC machine with wave-wound armature winding with 55 slots, each slot containing 19 conductors:N = 19, Z = 55, P = 4, n = 1500 rpm, φ = 3 mWb, A = 2 (Wave wound winding has 2 parallel paths)We can calculate the frequency, f as follows;f = P × (n / 60)f = 4 × (1500 / 60)f = 100 HzTherefore, the induced emf is given by;E = 2 × 3.14 × f × φ × N² / 60E = 2 × 3.14 × 100 × 3 × 19² / 60E = 1631.2 volts (rounded to one decimal place)Therefore, the voltage generated in the machine when driven at 1500 rpm is approximately 1631.2 V.Answer: 1631.2 V.

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5. A continuous hot rolling mill has two stands. Thickness of the starting plate = 1.0 in. and width = 12.0 in. Final thickness is to be 0.5 in. Roll radius at each stand = 10 in. Rotational speed at the first stand = 20 rev/min. Equal drafts of 0.25 in. are to be taken at each stand. The plate is wide enough relative to its thickness that no increase in width occurs. Under the assumption that the forward slip is equal at each stand determine (a) speed v, at each stand and (b) forward slip s. (c) also determine the exiting speeds at each rolling stand if the entering speed at the first stand is 85 ft/min.​

Answers

Answer:

(a) To determine the speed v at each stand, we can use the relationship between the forward slip, rotational speed, and rolling speed:

rolling speed = rotational speed × (1 - forward slip)

At the first stand, the thickness reduction is:

thickness reduction = draft / starting thickness = 0.25 / 1.0 = 0.25

The final thickness after the first stand is:

final thickness = starting thickness - thickness reduction = 1.0 - 0.25 = 0.75

The speed at the first stand is:

v1 = (π × 10^2 × 20) / (12 × 0.75) = 139.63 ft/min

At the second stand, the thickness reduction is again 0.25, and the final thickness is 0.5. The speed at the second stand is:

v2 = (π × 10^2 × 20) / (12 × 0.5) = 209.44 ft/min

(b) To determine the forward slip, we can use the formula:

forward slip = (rotational speed - rolling speed) / rotational speed

At the first stand:

forward slip1 = (20 - 139.63) / 20 = -5.98

At the second stand:

forward slip2 = (20 - 209.44) / 20 = -9.47

Note that the negative values indicate that the rolling speed is greater than the rotational speed, which is physically impossible. This suggests that the assumption of equal forward slip at each stand is not valid.

(c) The exiting speed at each rolling stand can be determined using the same formula as in part (a), but with the entering speed at the previous stand as the rolling speed:

At the first stand, entering speed = 85 ft/min:

v1 = 85 × (1 - (-5.98)) = 541.88 ft/min

At the second stand, entering speed = v1:

v2 = v1 × (1 - (-9.47)) = 922.57 ft/min

A second-degree burn may develop blisters

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Answer:

A second degree burn would have reddened, swollen skin, with blisters. So yes, your statement would be true.

Developer wishes to construct an office building of 10,000m2 gross floor area, of which 8,000 m2will be available for letting. The construction costs are estimated to be $6,000/m2. In addition, there are ancillary construction costs of $400,000 in laying roads and sewers to the building. Professional fees are estimated to total 13% of construction costs. Short-term finance is available at 16%. The expected rent is $3,000/m2 p.a. net. The developer wishes to see a return for risk and profit of 20% of development value. The pre-contract period is expected to be 6 months, the building work is estimated to take 15 months, and a period of 3 months has been allowed for letting. The developer intends to sell the completed and fully let development to a financial institution, and it is anticipated that an initial yield of 7% will be required. Within these parameters, the value of the site has to be established.

Answers

The value of the site is $10,472,000.

Here are the calculations:

The total construction costs are:

$6,000/m2 * 10,000m2 + $400,000 = $64,000,000

The professional fees are:

$64,000,000 * 0.13 = $8,320,000

The total development costs are:

$64,000,000 + $8,320,000 = $72,320,000

The developer's return for risk and profit is:

$72,320,000 * 0.20 = $14,464,000

The total cost of the development is:

$72,320,000 + $14,464,000 = $86,784,000

The expected rent is:

$3,000/m2 * 8,000m2 * 12 months = $28,800,000

The initial yield is:

$28,800,000 * 0.07 = $2,016,000

The value of the site is:

$86,784,000 - $2,016,000 = $10,472,000

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determine the distance aa as a fraction of the beam's length ll for locating the roller support so that the moment in the beam at bb is zero.

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The roller support on a beam with length L, a weight W, and a point load P at a distance of a from the roller support can be located at distance "a" from the left endpoint to make the moment at the beam's right endpoint zero. There is a point load P at point B, which is at distance b from the roller support.

Let's calculate the distance "a" from the left endpoint to the roller support in order to make the moment at point B zero. Let's assume that A is the distance between the left endpoint and the roller support. The moment at point B equals: M_B = (W*(L-A))/2 - P*(L-b) (1)
Setting MB equal to zero and solving for "a" yields the following result:a = (b/L)*L-(W/(2P))*(L-b).The roller support on a beam with length L, a weight W, and a point load P at a distance of a from the roller support can be located at distance "a" from the left endpoint to make the moment at the beam's right endpoint zero. The formula for determining this distance is (b/L)*L-(W/(2P))*(L-b).

The location of the roller support on a beam can be determined by calculating the distance from the left endpoint that makes the moment at the beam's right endpoint zero. This calculation involves the use of the beam's length, weight, and point load, as well as the distances between the left endpoint and the roller support and between the point load and the right endpoint. The formula for determining the distance of the roller support is (b/L)*L-(W/(2P))*(L-b).

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2.) A fluid moves in a steady manner between two sections in a flow
line. At section 1: A2 = 10 ft?, V = 100 fpm, vl = 4 ftp/lb
At section 2: A2 = 2 ft², P2 = 0.20 lb/ft?
Calculate (a.) the mass flow rate, and
(b.) the speed at section 2

Answers

Answer:

\(250\ \text{lbm/min}\)

\(625\ \text{ft/min}\)

Explanation:

\(A_1\) = Area of section 1 = \(10\ \text{ft}^2\)

\(V_1\) = Velocity of water at section 1 = 100 ft/min

\(v_1\) = Specific volume at section 1 = \(4\ \text{ft}^3/\text{lbm}\)

\(\rho\) = Density of fluid = \(0.2\ \text{lb/ft}^3\)

\(A_2\) = Area of section 2 = \(2\ \text{ft}^2\)

Mass flow rate is given by

\(m=\rho A_1V_1=\dfrac{A_1V_1}{v_1}\\\Rightarrow m=\dfrac{10\times 100}{4}\\\Rightarrow m=250\ \text{lbm/min}\)

The mass flow rate through the pipe is \(250\ \text{lbm/min}\)

As the mass flowing through the pipe is conserved we know that the mass flow rate at section 2 will be the same as section 1

\(m=\rho A_2V_2\\\Rightarrow V_2=\dfrac{m}{\rho A_2}\\\Rightarrow V_2=\dfrac{250}{0.2\times 2}\\\Rightarrow V_2=625\ \text{ft/min}\)

The speed at section 2 is \(625\ \text{ft/min}\).

(a) The mass flow rate will be "250 lbm/min".

(b) At section 2, the speed will be "625 ft/min".

Speed and Mass

According to the question,

Section 1 area, A₁ = 10 ft²

Section 2 area, A₂ = 2 ft²

Water's velocity, V₁ = 100 ft/min

Volume at section 1, v₁ = 4 ft³/lbm

(a) We know the formula,

Mass flow rate, m = ρA₁V₁

                              = \(\frac{A_1 V_1}{v_1}\)

By substituting the values,

                              = \(\frac{10\times 100}{4}\)

                              = \(\frac{1000}{4}\)

                              = 250 lbm/min

(2) The speed will be:

→ m = ρA₂V₂

or,

  V₂ = \(\frac{m}{\rho A_2}\)

By substituting the values,

       = \(\frac{250}{0.2\times 2}\)

       = \(\frac{200}{0.4}\)

       = 625 ft/min

Thus the responses above are correct.  

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The opcode of MOV AX, BX is AX or BX. Select one: True False

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The opcode of the instruction MOV AX, BX is neither AX nor BX, but rather the binary code 10001011. This instruction moves the contents of register BX into register AX in the x86 assembly language.

This can be explained as follows:Opcode is the hexadecimal value of the operation code (op code) used to specify the instruction to be executed in a computer's central processing unit (CPU).It tells the processor what to do with the operands of the instruction (such as AX, BX in this case). The opcode is used to assemble machine code, which the CPU can then execute. In general, opcodes are used to specify operations that can be performed by a processor, such as moving data between registers (MOV), adding numbers (ADD), and comparing data (CMP).The opcode of MOV AX, BX is a two-byte instruction in which the first byte specifies the opcode (8B in hexadecimal) and the second byte specifies the registers involved in the instruction (C3 in hexadecimal). The instruction is encoded as follows: 8B C3. Hence, we can say that the answer is false.

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The temperature distribution across a wall 0.3 m thick at a certain instant of time is T(x) a bx cx2 , where T is in degrees Celsius and x is in meters, a 200 C, b 200 C/m, and c 30 C/m2 . The wall has a thermal conductivity of 1 W/mK. (a) On a unit surface area basis, determine the rate of heat transfer into and out of the wall and the rate of change of energy stored by the wall. (b) If the cold surface is exposed to a fluid at 100 C, what is the convection coefficient

Answers

Answer:

the rate of heat transfer into the wall is \(\mathbf{q__{in}} \mathbf{ = 200 W/m^2}\)

the rate of heat output is \(\mathbf{q_{out} =182 \ W/m^2}\)

the rate of change of energy stored by the wall is \(\mathbf{ \Delta E_{stored} = 18 \ W/m^2 }\)

the convection coefficient is h = 4.26 W/m².K

Explanation:

From the question:

The temperature distribution across the wall is given by :

\(T(x) = ax+bx+cx^2\)

where;

T = temperature in ° C

and a, b, & c are constants.

replacing 200° C for a, - 200° C/m for b and  30° C/m² for c ; we have :

\(T(x) = 200x-200x+30x^2\)

According to the application of Fourier's Law of heat conduction.

\(q_x = -k \dfrac{dT}{dx}\)

where the rate of heat input \(q_{in} = q_k\) ; Then x= 0

So:

\(q_{in}= -k (\dfrac{d( 200x-200x+30x^2)}{dx})_{x=0}\)

\(q_{in}= -1 (-200+60x)_{x=0}\)

\(\mathbf{q__{in}} \mathbf{ = 200 W/m^2}\)

Thus , the rate of heat transfer into the wall is \(\mathbf{q__{in}} \mathbf{ = 200 W/m^2}\)

The rate of heat output is:

\(q_{out} = q_{x=L}\); where x = 0.3

\(q_{out} = -k (\dfrac{dT}{dx})_{x=0.3}\)

replacing T with \(200x-200x+30x^2\) and k with 1 W/m.K

\(q_{out} = -1 (\dfrac{d(200x-200x+30x^2)}{dx})_{x=0.3}\)

\(q_{out} = -1 (-200+60x)_{x=0.3}\)

\(q_{out} = 200-60*0.3\)

\(\mathbf{q_{out} =182 \ W/m^2}\)

Therefore , the rate of heat output is \(\mathbf{q_{out} =182 \ W/m^2}\)

Using energy balance to determine the change of energy(internal energy) stored by the wall.

\(\Delta E_{stored} = E_{in}-E_{out} \\ \\ \Delta E_{stored} = q_{in}- q_{out} \\ \\ \Delta E_{stored} = (200 - 182 ) W/m^2 \\ \\\)

\(\mathbf{ \Delta E_{stored} = 18 \ W/m^2 }\)

Thus; the rate of change of energy stored by the wall is \(\mathbf{ \Delta E_{stored} = 18 \ W/m^2 }\)

We all know that for a steady state, the heat conducted to the end of the plate must be convected to the surrounding fluid.

So:

\(q_{x=L} = q_{convected}\)

\(q_{x=L} = h(T(L) - T _ \infty)\)

where;

h is the convective heat transfer coefficient.

Then:

\(Replacing \ 182 W/m^2 \ for \ q_{x=L} , (200-200x +30x \ for \ T(x) \ , 0.3 m \ for \ x \ and \ 100^0 C for \ T\) We have:

182 = h(200-200×0.3 + 30 ×0.3² - 100 )

182 = h (42.7)

h = 4.26 W/m².K

Thus, the convection coefficient is h = 4.26 W/m².K

A 2-8/ 6-8 door would measure:

Answers

Answer:

2-8

6-8

= -6

-2

= 3

because the minus cancels each other and then 6 divided by 2 is 3

For welding the most important reason to use jigs and fixtures in a welding shop is to

Answers

Answer:

Reduce manufacturing costs.

Explanation:

Hope This Helps

Have A Great Day

grade 5 bolts have __ identifying on the head

Answers

Grade 5 bolts have 3 marks identifying on the head

This is further explained below.

What are Grade 5 bolts?

Generally,  When looking for the correct bolt, it is essential to check that the grades of the bolts that are currently being used are compatible with one another.

There is no difference between Grade 5 Bolts and Metric.

8 Bolts. The presence of three marks on the head of a Grade 5 bolt is often all that is required for successfully identifying the bolt.

In conclusion, The head of a grade 5 bolt will have three distinguishing markings on it.

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1. An access control system controls access to area restricted area or facility using physical and computer-related devices, equipment along with ___.

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An access control system controls access to area restricted area or facility using physical and computer-related devices, equipment along with authentication and authorization mechanisms.

software and/or managed databases?

During which step of a free-radical chain-growth polymerization does the polymer actually grow or chain extend?.

Answers

During  propagation step of a free-radical chain-growth polymerization does the polymer actually grow or chain extend.

What is radical chain-growth polymerization?

The process of free-radical chain growth in polymers. Common free-radical reactions include polymerizations using free-radical mechanisms. The formation of radicals is the initiation, the development of the products is the propagation, and the ending of the free-radical chain reactions is the termination.

What distinguishes step growth polymerization from chain growth polymerization?

The polymer chain in chain growth always expands one monomer at a time. The polymer chain doubles with each step of step development. The polymer chain's rate of expansion is drastically different in these two situations as a result. Every coupling step causes chain growth, which causes the chain length to gradually expand.

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Why does the us import oil? because it does not produce any oil at all because it needs higher quality oil than it produces because it has exported too much oil to nearby countries because it is cheaper to import oil than to produce it

Answers

US import oil because it is cheaper to import oil than to produce it

What is importation?

Importation is a way of bringing in goods and services from neighbouring country into your country.

Countries import because it helps them to supply high cost and scarce resources to its market with products from other countries at a very cheap rate.

Hence we can conclude that US import oil because it is cheaper to import oil than to produce it.

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Answer:

because it is cheaper to import oil than to produce it

Explanation:

d on edge2023

On a dual, day, vfr flight, lusoa pilots should plan to land with at a minimum of ___ minutes of fuel on board.

Answers

Answer:

30 -45 min

Explanation:

4. a. A family purchased a 3 acre piece of land in Limuru for Kshs.30,000,000.00 fifteen years ago. They planted trees at a cost of Kshs.250,000.00 per acre. Each year they have been spending on average Kshs.25,000.00 per acre per month to take care of the trees and also to secure the property. They are now considering selling it. What is the minimum amount they should accept so as not to incur a loss bearing in mind that comparable properties have been yielding a rate of 6.5% interest per annum? (8 marks)

b. “Compulsory acquisition is the power of government to acquire private rights in land for public good without the willing consent of the owner but; in exchange for compensation”. Discuss this statement with special reference to the main considerations that ought to be made in conducting a valuation for compulsory acquisition. (12 marks)

Answers

The family should accept a minimum of Kshs.42,250,000.00 to avoid incurring a loss.

Why should they accept this amount and why?

To obtain the total cost, the expenses for the land, trees and upkeep are summed up and subsequently reduced by 6. 5% using a discount rate.

Hence, it can be seen that a forced acquisition appraisal primarily focuses on three key factors: the land's market value, the expenses involved in replacing the property, and the potential harm caused to the owner's belongings.

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A circular casting is 0. 3 m in diameter and 0. 6 m in length. Another casting of the same metal is elliptical in cross section, with a major-to-minor axis ratio of 2. 5 and has the same length and cross sectional area as the circular casting. Both pieces are cast under the same conditions. What is the ratio of the solidification times of the two castings

Answers

The solidification time of a casting is influenced by factors such as the volume and shape of the casting, as well as the cooling rate.So, the ratio of the solidification times of the two castings is 1:1.

In this case, we are comparing a circular casting and an elliptical casting with the same length and cross-sectional area.Let's assume the solidification time of the circular casting is Tc, and the solidification time of the elliptical casting is Te. Since the cross-sectional areas of both castings are the same, we can assume that the volume of the castings is also the same.

The volume of the circular casting can be calculated using the formula: Vc = πr²h, where r is the radius (half of the diameter) and h is the length.

Vc = π(0.3/2)²(0.6) = 0.0424 m³

The volume of the elliptical casting can be calculated using the formula: Ve = πa²b, where a and b are the major and minor semi-axes lengths, respectively.

Ve = π(0.3/2)(0.3/2)(2.5)(0.6) = 0.0424 m³

Since the volumes of the castings are equal, we can assume that the solidification times are proportional to their volumes. Therefore, the ratio of the solidification times can be expressed as:

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when welding which steps should be taken to protect the welder and/or others in the area

Answers

Answer:

eye protection safety gloves and rubber shoes and a safe ground

Explanation:

A mixed economy combines the traits of which two economic systems?
A. Marxist and traditional
B. Market and command
C. Traditional and market
D. Command and traditional

Answers

A mixed economy combines the traits of these two (2) economic systems: B. market and command.

What is a mixed economy?

A mixed economy can be defined as a type of economic system in which the government of a particular country is minimally involved in the allocation and production of goods and services, while effectively protecting the interest of the consumers and regulating the market by establishing laws.

This ultimately implies that, a mixed economy combines the traits of these two (2) economic systems market and command.

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a centrifugal pump delivers water at the rate of 50kg/is . the inlet and outlet pressure are 2 bar and 6.2 bar respectively. the suction is 2.2 m below the center of the pump and delivery is 8.5 m above the above the center of the pump. the suction and delivery pipe diameter are 200 mm and 100 mm respectively. determine the capacity of the electric motor considering the efficiency of motor as 80℅to run the pump.​

Answers

Answer:

21.6 kw

Explanation:

Given data:

m = 50 kg/s

Inlet pressure (p1) = 2 bar

outlet pressure(p2) = 6.2 bar

suction ( h1 ) = -2.2 m

delivery ( h2 ) = 8.5 m

d1 = 200 mm = 0.2 m

d2 = 100 mm = 0.1 m

Vs of water = 0.001 m^3/kg

next we have to determine the Q value

Q = V*A

Q = 0.001 * 50 = 0.05 m^3/s

next we have to calculate the various V's

V1 = Q/A1 = \(\frac{0.05*4}{\pi *0.2^2}\)  = 1.59 m/s

V2 = Q/A2 = \(\frac{0.05*4}{\pi *0.1^2}\) = 6.37 m/s

Determine the capacity of the electric motor

attached below is the detailed solution

a centrifugal pump delivers water at the rate of 50kg/is . the inlet and outlet pressure are 2 bar and

What would be the required voltage of an energy source in a circuit with a current of 10.0 A and a resistance of 11.0 Ω?

Answers

Answer:

  110 V

Explanation:

V = IR

V = (10.0 A)(11.0 Ω) = 110 volts

phase field dislocation dynamics (pfdd) modeling of non-schmid behavior in bcc metals informed by atomistic simulations

Answers

Phase Field Dislocation Dynamics (PFDD) is a computational modeling technique used to simulate the behavior of dislocations in crystalline materials.

It combines the phase field method, which describes the evolution of a scalar order parameter, with the dislocation dynamics theory. PFDD allows for the study of dislocation interactions, evolution, and their effect on the material's mechanical behavior.

In the case of modeling non-Schmid behavior in body-centered cubic (BCC) metals, PFDD can be informed by atomistic simulations to incorporate more accurate and realistic dislocation properties.

Atomistic simulations, such as molecular dynamics (MD) or density function theory (DFT), provide detailed information about the atomic-scale behavior of dislocations, including dislocation core structures and their interactions with other defects.

Here is a general outline of how atomistic simulations can inform PFDD modeling for non-Schmid behavior in BCC metals:

1. Atomistic simulations: Perform atomistic simulations, such as MD or DFT, to investigate the dislocation properties and behaviors specific to the BCC metal of interest. This includes studying dislocation core structures, dislocation mobility, and dislocation interactions with other defects.

2. Extracting parameters: Extract relevant parameters from the atomistic simulations that describe the non-Schmid behavior. These parameters can include dislocation line tension, line mobility, and the Peierls barrier, which represents the energy barrier for dislocation motion.

3. Parameterization: Incorporate the extracted parameters into the PFDD model. The non-Schmid behavior can be incorporated by modifying the governing equations or adding additional terms to account for the specific dislocation properties observed in the atomistic simulations.

4. PFDD simulations: Conduct PFDD simulations using the modified model. The PFDD simulations will provide a larger-scale description of dislocation dynamics, interactions, and their effects on material behavior, accounting for the non-Schmid behavior observed in the atomistic simulations.

5. Validation and analysis: Compare the results of the PFDD simulations with experimental data or other atomistic simulations to validate the model's accuracy. Analyze the simulation results to gain insights into the dislocation behavior, material deformation mechanisms, and the effect of non-Schmid behavior on the overall material response.

By combining the strengths of atomistic simulations and PFDD, this approach allows for a multiscale understanding of dislocation behavior, capturing both the atomistic details and the larger-scale mechanical response of BCC metals. It provides a powerful tool for studying dislocation-mediated plasticity and material deformation in complex systems.

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The mean of 10 numbers is 9, then the sum (total) of these numbers will be​

Answers

Answer:

90

Explanation:

mean is basically taking the sum of all numbers and then dividing the sum with the number of all given numbers..

here, the mean is 9, total numbers are 10.. so the sum will be 9 multiplied by 10, that is 90.

If the mean of 10 numbers is 9, then the sum (total) of these numbers will be​ 90. The correct option is D.

What is mean?

The mean is the average of a set of variables in mathematics and statistics. The mean can be calculated in a variety of ways, including the simple arithmetic mean (add the numbers and divide the total by the number of observations), geometric mean, and harmonic mean. Mean is denoted by a small m.

To calculate mean: Arrange the data items in ascending order from least to greatest. If the number of points is odd, the median is the data point in the middle of the list. If the number of data points in the list is even, the median is the average of two middle data points.

Mean = total sum of the numbers/total numbers

9 = total sum of the numbers / 10

The sum of the terms = 9 x 10 = 90

90 = total sum of the numbers

Therefore, the correct option is D. 90

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The question is incomplete. Your most probably complete question is given below:

A. 9. B. 0.9. C. 70. D. 90

Never operate electric tools outdoors or in wet conditions unless circuit is protected by what?.

Answers

Never operate electric tools outdoors or in wet conditions unless the circuit is protected by a ground fault circuit interrupter (GFCI).

What is a circuit?

When a number of electric entities are connected through various conductors is called a circuit.

Here,
A ground fault circuit interrupter (GFCI) helps to avoid the repercussion caused due to electric shocks. An individual receives a shock, the GFCI perceives this and cuts off the current before the individual can get any damage. it is usually installed where electrical circuits come into reference with water.

Thus, Never operate electric tools outdoors or in wet conditions unless the circuit is protected by a ground fault circuit interrupter (GFCI).

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A person walks into a refrigerated warehouse with head uncovered. Model the head as a 25- cm diameter sphere at 35°C with a surface emissivity of 0.95. Heat is lost from the head to the surrounding air at 25°C by convection with a convection coefficient of ???????????????? ???????? ????????????????∙???????? , and by radiation to the surrounding black walls at 15°C. Determine the total rate of heat loss. StefanBoltzmann Constant, ???????? = ????????. ???????????????? × ????????????????−???????? ???????? ????????????????∙???????????????? . (10 points)

Answers

Answer:

Hello some parts of your question is missing below is the missing part

Convection coefficient = 11 w/m^2. °c

answer : 44.83 watts

Explanation:

Given data :

surface emissivity ( ε )= 0.95

head ( sphere) diameter( D )  = 0.25 m

Temperature of sphere( T )  = 35° C

Temperature of surrounding ( T∞ )  = 25°C

Temperature of surrounding surface ( Ts ) = 15°C

б  = ( 5.67 * 10^-8 )

Determine the total rate of heat loss

First we calculate the surface area of the sphere

As = \(\pi D^{2}\)  

= \(\pi * 0.25^2\) =  0.2 m^2

next we calculate heat loss due to radiation

Qrad = ε * б * As( \(T^{4} - T^{4} _{s}\) )  ---- ( 1 )

where ;

ε = 0.95

б = ( 5.67 * 10^-8 )

As = 0.2 m^2

T = 35 + 273 = 308 k

Ts = 15 + 273 = 288 k

input values into equation 1

Qrad = 0.95 * ( 5.67 * 10^-8 ) * 0.2 ( (308)^4 - ( 288)^4 )

         = 22.83  watts

Qrad ( heat loss due to radiation ) = 22.83 watts

calculate the heat loss due to convection

Qconv = h* As ( ΔT )

           = 11*0.2 ( 35 -25 )  = 22 watts

Hence total rate of heat loss

=  22 + 22.83

= 44.83 watts

In this exercise you will define language four, an extension of language three. Here is a sample program in language four, showing all the new constructs: let val fact = fn x => if x<2 then x else x * fact (x-1) in fact 5 end As you can see, language four extends language three with three new constructs: the < operator for comparison, the - operator for subtraction, and the conditional (if-then-else) expression. The sample program above defines a recursive factorial function and uses it to compute the factorial of 5. A. Define the syntax of Language Four by extending the syntax of Language Three with the three additional constructs required. Show your new BNF. Make sure it is unambiguous. B. Define the three new kinds of AST nodes you need to match your extended syntax. Extend the Prolog implementation of Language Three to handle them. (You will need to start with the dynamic-scoping implementation, since the static-scoping one cannot handle recursive definitions. For this reason, the sample program above is not legal in ML.) Verify that your implementation evaluates the sample program correctly _ the factorial of 5 is 120. C. Give a natural semantics for Language Four.

Answers

Language Four is an extension of Language Three that adds the < operator for comparison, the - operator for subtraction, and the conditional expression (if-then-else). The BNF syntax of Language Four is defined and three new kinds of AST nodes are introduced. The Prolog implementation of Language Three is extended to handle these new constructs, and a natural semantics for Language Four is provided.

How to define and implement Language Four?

A. Syntax of Language Four:

<expr> ::= <num>

| <id>

| <expr> + <expr>

| <expr> * <expr>

| <expr> - <expr>

| <expr> < <expr>

| if <expr> then <expr> else <expr>

| fn <id> => <expr>

| let <binding> in <expr>

<binding> ::= <id> = <expr>

BNF:

<expr> ::= <num>

| <id>

| <expr> + <expr>

| <expr> * <expr>

| <expr> - <expr>

| <expr> < <expr>

| if <expr> then <expr> else <expr>

| fn <id> => <expr>

| let <binding> in <expr>

<binding> ::= <id> = <expr>

B. Three new kinds of AST nodes:

Less Than Node(left, right) - represents the comparison of two expressions with the < operator

Minus Node(left, right) - represents the subtraction of two expressions with the - operator

If Node(cond, then _expr, else _expr) - represents the conditional expression if-then-else

Prolog implementation:

eval (Num, _, Num) :- number(Num).

eval(Id, Env, Val) :- atom(Id), lookup(Id, Env, Val).

eval(plus(Left, Right), Env, Val) :-

eval(Left, Env, LeftVal),

eval(Right, Env, RightVal),

Val is LeftVal + RightVal.

eval(times(Left, Right), Env, Val) :-

eval(Left, Env, LeftVal),

eval(Right, Env, RightVal),

Val is LeftVal * RightVal.

eval(minus(Left, Right), Env, Val) :-

eval(Left, Env, LeftVal),

eval(Right, Env, RightVal),

Val is LeftVal - RightVal.

eval(lessThan(Left, Right), Env, true) :-

eval(Left, Env, LeftVal),

eval(Right, Env, RightVal),

LeftVal < RightVal.

eval(lessThan(Left, Right), Env, false) :-

eval(Left, Env, LeftVal),

eval(Right, Env, RightVal),

LeftVal >= RightVal.

eval(if(Cond, Then, _), Env, Val) :-

eval(Cond, Env, true),

eval(Then, Env, Val).

eval(if(Cond, _, Else), Env, Val) :-

eval(Cond, Env, false),

eval(Else, Env, Val).

eval(fn(Param, Body), Env, closure(Param, Body, Env)).

eval(let(Binding, Body), Env, Val) :-

eval(Binding, Env, NewEnv),

append(NewEnv, Env, ExtEnv),

eval(Body, ExtEnv, Val).

eval(assign(Id, Expr), Env, Val) :-

eval(Expr, Env, Val),

update(Id, Env, Val, NewEnv).

eval(CallExpr, Env, Val) :-

CallExpr =.. [Name | Args],

evalArgs(Args, Env, ArgVals),

lookup(Name, Env, closure(Param, Body, ClosureEnv)),

bind(Param, ArgVals, ClosureEnv, NewEnv),

eval(Body, NewEnv, Val).

evalArgs([], _, []).

evalArgs([H | T], Env, [HVal | TVal]) :-

eval(H, Env, HVal),

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1.What is three phase? why it is needed?
2. What is the condition to be balanced? Write down voltage equation of a balanced 3 phase voltage source and draw their phasor diagram.

Answers

1. We can see here that three phase refers to a type of electrical power transmission that uses three alternating current (AC) waveforms that are 120 degrees out of phase with each other. This is different from single-phase power transmission, which uses only one AC waveform.

What is voltage?

Voltage, also known as electric potential difference, is a measure of the electrical potential energy per unit of charge in an electrical circuit. It is defined as the amount of work required to move a unit of electric charge between two points in a circuit, typically measured in volts (V).

Three-phase power is needed because it allows for more power to be transmitted over a given amount of wire or cable. With three-phase power, the power is delivered in a more consistent manner, which means that there is less voltage drop over long distances.

2. In order for a three-phase system to be balanced, the three phases must have the same amplitude and be 120 degrees out of phase with each other. The voltage equation of a balanced three-phase voltage source is given by:

Vph = Vline / √3

where Vph is the phase voltage and Vline is the line voltage. The phasor diagram for a balanced three-phase system shows three sinusoidal waveforms that are displaced by 120 degrees from each other.

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Reservoir simulation

Reservoir simulation

Answers

Answer:

I recommend getting brainly plus because it helps alot

MARKING BRAINLIEST
What is a good prototype plan?

Answers

Answer:

The plan is to make your design on AutoCAD and then make technical drawings. Print those technical drawings out with a scale of 1:1 and use those to trace over wood or metal.

Explanation:

Answer:

Make your design, make technical drawings, 3D print or trace

Explanation:

Anything you want to do in Hootsuite can be found in the ________, with the main workspace in the _________?
Settings; Streams
Sidebar; center
Header; Sidebar
Nav-panel; dashboard

Answers

Answer:

Anything you want to do in Hootsuite can be found in the ___ Sidebar_____, with the main workspace in the ___center______

Sidebar; center

Explanation:

The main workspace of the Hootsuite is located in the center.  The sidebar is where the core access to the Hootsuite functionality, like Streams, Inbox, Planner, Analytics, Publisher, and the App Directory, is obtained.  Hootsuite is a media management platform for curating content, scheduling posts, managing team members, and measuring performances.

Trace the output of the following code? int n = 15; while (n > 0) { n/= 2; cout << n * n << ""; }

Answers

The given code of the while loop will output the following result: 49, 9,1,0.

Let us analyze the given code, where the integer n is first initialized to 15.

In the while loop, it checks whether n is greater than zero.

If true, it then divides n by two and multiplies the result with itself, then prints it.

This will repeat until n becomes less than or equal to zero.

Here's how the iterations unfold:

Iteration 1:

n becomes 15 / 2 = 7

n * n = 7 * 7 = 49

Iteration 2:

n becomes 7 / 2 = 3

n * n = 3 * 3 = 9

Iteration 3:

n becomes 3 / 2 = 1 (integer division)

n * n = 1 * 1 = 1

Iteration 4:

n becomes 1 / 2 = 0 (integer division)

n * n = 0 * 0 = 0

At this point, the condition n > 0 is no longer true, and the loop terminates.

The final output is 49 9 1 0, as each iteration's result is printed.

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