We need to apply the First Law of Thermodynamics, considering the enthalpy change of the methane and air, as well as the heat capacity of the products of combustion. By calculating the enthalpy changes and the mass flow rates of the reactants and products, we can determine the rate of heat transfer, denoted as Qev, in kilowatts.
To calculate the rate of heat transfer for the control volume, we can follow these steps:
1. Determine the enthalpy change of the methane (CH₄) and air (O₂ and N₂) by using the heat of formation data. The enthalpy change for the complete combustion of methane can be obtained by subtracting the enthalpy of the reactants from the enthalpy of the products.
2. Calculate the mass flow rate of the methane based on the given information of 1.4 kg/min.
3. Determine the mass flow rate of the air entering the furnace by multiplying the mass flow rate of the methane by the stoichiometric ratio between methane and air. Since the air is 140% of the theoretical amount, the stoichiometric ratio is 1.4 kg/min * 1.4 = 1.96 kg/min.
4. Calculate the total mass flow rate of the products of combustion exiting the furnace by summing the mass flow rates of the methane and air.
5. Calculate the heat capacity of the products of combustion by using the average specific heat capacity for the mixture of the products.
6. Apply the First Law of Thermodynamics equation, which states that the rate of heat transfer is equal to the mass flow rate multiplied by the enthalpy change plus the heat capacity multiplied by the temperature difference.
7. Substitute the calculated values into the First Law equation to determine the rate of heat transfer, denoted as Qev, in kilowatts.
By following these steps and performing the necessary calculations, you can determine the rate of heat transfer for the control volume enclosing the reacting gases.
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Safety management is critical and accident prevention is of utmost importance. a) Outline the areas covered by Occupational Health and Safety. b) What are the steps/approaches to safety management in a workplace? To combat against fraud or bribery. It is critical to exercise internal control program. Outline the requirements.
a) Areas covered by Occupational Health and SafetyThe areas covered by Occupational Health and Safety are as follows:Safety training and awareness.PPE (personal protective equipment) and its proper use.General safety procedures.
Emergency response and evacuation procedures.Workplace hazard identification and risk assessment.Workplace inspections, audits, and evaluations.
b) Steps/approaches to safety management in a workplaceThe following are the steps/approaches to safety management in a workplace:
Step 1: A Safety Management System should be established
Step 2: The Safety Management System should be documented.
Step 3: Management should demonstrate their commitment to the Safety Management System
Step 4: A competent person should be appointed to oversee safety management.
Step 5: Identify the hazards in the workplace.
Step 6: Assess the risks associated with those hazards.
Step 7: Control the risks.
Step 8: Review and revise the Safety Management System on a regular basis.
In summary, the Occupational Health and Safety Administration covers a broad range of areas that are critical to safety management in a workplace. To combat fraud or bribery, a company's internal control programme must be robust and address all risk areas.
In addition, having a safety management system in place will reduce accidents and promote a healthy workplace. Therefore, the effective implementation of Occupational Health and Safety as well as a safety management system is critical for organizations to have a safe and productive work environment.
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A six poles three-phase squirrel-cage induction motor, connected to a 50 Hz three-phase feeder, possesses a rated speed of 975 revolution per minute, a rated power of 90 kW, and a rated efficiency of 91%. The motor mechanical loss at the rated speed is 0.5% of the rated power, and the motor can operate in star at 230 V and in delta at 380V. If the rated power factor is 0.89 and the stator winding per phase is 0.036 12 a. b. c. d. Determine the power active power absorbed from the feeder (2.5) Determine the reactive power absorbed from the line (2.5) Determine the current absorbed at the stator if the windings are connected in star (2.5) Determine the current absorbed at the stator if the windings are connected in delta (2.5) Determine the apparent power of the motor. (2.5) Determine the torque developped by the motor (2.5) Determine the nominal slip of the motor (2.5) e. f. g.
The six poles three-phase squirrel-cage induction motor is connected to a 50 Hz three-phase feeder, and it has a rated speed of 975 revolutions per minute, a rated power of 90 kW, and a rated efficiency of 91%.
The motor mechanical loss at the rated speed is 0.5% of the rated power, and it can operate in star at 230 V and in delta at 380V. The rated power factor is 0.89, and the stator winding per phase is 0.036 12 a.
Thus, the power absorbed from the feeder is 82 kW, the reactive power absorbed from the line is 18.48 kVA, the stator current in star is 225 A, the stator current in delta is 130 A, the apparent power of the motor is 92.13 kVA, the torque developed by the motor is 277 Nm, and the nominal slip of the motor is 2.5%.
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ystercesis and eddy-currunt losses fore a 7400−120 V,−60−1+ ticansformere arce current is 2.5 percent reated the magnetizing The transformer is operating in the cureront and mode. Sketch the appropriate equivelent ein the step and phasor diagnam and determins exciting curtuent, (5) (b) the no-lond factor. (c) the reoctive power input
(a) The hysteresis and eddy current losses depend on the operating current of a 7400-120 V, -60 Hz transformer.
(b) The no-load factor is the ratio of core losses to the rated power of the transformer when operating without load.
(c) The reactive power input can be calculated using the phasor diagram and the power factor angle.
(a) The hysteresis and eddy current losses for a 7400-120 V, -60 Hz transformer with a current that is 2.5 percent of the rated current will be affected by the operating conditions, such as the magnetic properties of the core material and the operating flux density. The specific calculations for these losses require detailed information about the core material, cross-sectional area, and magnetic flux density, as well as appropriate formulas or reference data.
(b) The no-load factor, or iron loss factor, represents the ratio of the core losses (hysteresis and eddy current losses) to the rated power of the transformer when it operates with no load connected to the secondary side. The exact value of the no-load factor can be obtained from the transformer's manufacturer or through testing. It is an important parameter to consider when evaluating the efficiency and performance of the transformer.
(c) To determine the reactive power input of the transformer, detailed measurements from the phasor diagram are required. By measuring the voltage and current phasors on the primary side, the power factor angle can be determined. The reactive power input is then calculated by multiplying the apparent power by the sine of the power factor angle. Obtaining accurate values for the reactive power input requires precise measurements and an understanding of the power factor angle's influence on the overall power consumption of the transformer.
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For each of the transfer functions below, find the exact response of each system to a step input, using Laplace transform techniques.
a. T(s) = (s+3)(s+6) 10(s+7)
b. T(s) (s+10) (s+20) 20 c. T(s) s²+6s+144 s+2 d. T(s) s²+9 e. T(s) = s+5 (s+10)²
Step-by-step solutions for the given transfer functions are as follows a. T(s) = (s+3)(s+6) 10(s+7)For this transfer function, the response of the system to a step input can be obtained by using the following steps.
After obtaining the values of A, B, and C, the inverse Laplace of the transfer function will be as follows'(t) By putting the given values of A, B, C, and y(0), we get the exact response of the system to a step input as follows:
y(t) = (0.0833 e⁻⁷ᵗ) - (0.0268 e⁻³ᵗ) + (0.9435 e⁻⁶ᵗ) b.
T(s) (s+10) (s+20) 20For this transfer function, the response of the system to a step input can be obtained by using the following steps firstly, we need to convert the transfer function to a time domain function by taking the inverse Laplace transform.
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Define the following terms in the synchronous machine (8 points): a. Load (power) angle b. Phase angle c. static stability limits d. capability curve
Here's what these terms mean and why they're so important: Load (Power) Angle: When the synchronous generator is connected to the infinite bus, the angle between the stator's voltage and the rotor's magnetic field is referred to as the load or power angle. option a
Load angle, phase angle, static stability limits, and capability curve are all significant parameters in the synchronous machine.
The power angle is affected by the mechanical torque of the machine and the electrical power being generated by the machine.
Phase Angle: The angle between two sinusoidal quantities that are of the same frequency and are separated by a given time difference is known as the phase angle.
The phase angle represents the relative position of the voltage and current waveforms on a graph.
Static Stability Limits: Static stability is determined by the synchronous generator's capacity to withstand transient power swings.
If the torque exceeds the generated power, the rotor angle increases.
The generator's rotor could be separated from the rotating magnetic field if the angle exceeds a certain limit.
This is referred to as a loss of synchronism or a blackout.
Capability Curve:
graph that demonstrates the power that a generator can produce without becoming unstable or damaging the generator is referred to as the capability curve.
It is a representation of the maximum electrical power that the machine can generate while remaining synchronized with the power grid.
the significance of the terms load angle, phase angle, static stability limits, and capability curve in the synchronous machine.
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Design a connecting rod for a sewing machine so that it can be produced by sheet metal working, given that the diameter of each of the two holes is 0.5 inches (12.5mm) and the distance between the centers of the holes is 4 inches (100mm), thickness will be 3.5mm.
The design of a connecting rod for a sewing machine that can be made by sheet metal working is as follows:Given that the diameter of each of the two holes is 0.5 inches (12.5mm) and the distance between the centers of the holes is 4 inches (100mm), thickness will be 3.5mm. The following is a design that fulfills the requirements:
Connecting rods are usually made using forging or casting processes, but in this case, it is desired to make it using sheet metal working, which is a different process. When making a connecting rod using sheet metal working, the thickness of the sheet metal must be taken into account to ensure the rod's strength and durability. In this case, the thickness chosen was 3.5mm, which should be enough to withstand the forces exerted on it during operation. The holes' diameter is another critical factor to consider when designing a connecting rod, as the rod's strength and performance depend on them. The diameter of the holes in this design is 0.5 inches (12.5mm), which is appropriate for a sewing machine's requirements.
Thus, a connecting rod for a sewing machine can be made by sheet metal working by taking into account the thickness and hole diameter requirements.
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Consider a reheat Rankine cycle with a net power output of 100 MW. Steam enters the high pressure turbine at 10 MPa and 500°C and the low pressure turbine at 1 MPa and 500°C. The steam leaves the condenser at 10 kPa. The isentropic efficiencies of turbine and pump are 80% and 95%, respectively. 1. Show the cycle on a T-S diagram with respect to saturation lines. 2. Determine the mass flow rate of steam. 3. Determine the thermal efficiency for this cycle. 4. Determine the thermal efficiency for the equivalent Carnot cycle and compare it with the Rankine cycle efficiency. 5. Now assume that both compression and expansion processes in the pump and turbine are isentropic. Calculate the thermal efficiency of the ideal cycle.
The Rankine cycle is a thermodynamic cycle that describes the operation of a steam power plant, where water is heated and converted into steam to generate mechanical work.
To solve the given problem, we'll follow these steps:
Show the cycle on a T-S diagram with respect to saturation lines:
Plot the states of the cycle on a T-S (temperature-entropy) diagram.
The cycle consists of the following processes:
a) Isentropic expansion in the high-pressure turbine (1-2)
b) Isentropic expansion in the low-pressure turbine (2-3)
c) Isobaric heat rejection in the condenser (3-4)
d) Isentropic compression in the pump (4-5)
e) Isobaric heat addition in the boiler (5-1)
The saturation lines represent the phase change between liquid and vapor states of the working fluid.
Determine the mass flow rate of steam:
Use the net power output of the cycle to calculate the rate of heat transfer (Q_in) into the cycle.
The mass flow rate of steam (m_dot) can be calculated using the equation:
Q_in = m_dot * (h_1 - h_4)
where h_1 and h_4 are the enthalpies at the corresponding states.
Substitute the known values and solve for m_dot.
Determine the thermal efficiency for this cycle:
The thermal efficiency (η) is given by:
η = (Net power output) / (Q_in)
Calculate Q_in from the mass flow rate of steam obtained in the previous step, and substitute the given net power output to find η.
Determine the thermal efficiency for the equivalent Carnot cycle and compare it with the Rankine cycle efficiency:
The Carnot cycle efficiency (η_Carnot) is given by:
η_Carnot = 1 - (T_low / T_high)
where T_low and T_high are the lowest and highest temperatures in Kelvin scale in the cycle.
Determine the temperatures at the corresponding states and calculate η_Carnot.
Compare the efficiency of the Rankine cycle (η) with η_Carnot.
Calculate the thermal efficiency of the ideal cycle assuming isentropic compression and expansion:
In an ideal cycle, assuming isentropic compression and expansion, the thermal efficiency (η_ideal) is given by:
η_ideal = 1 - (T_low / T_high)
Determine the temperatures at the corresponding states and calculate η_ideal.
Note: To calculate the specific enthalpy values (h) at each state, steam tables or appropriate software can be used.
Performing these calculations will provide the required results and comparisons for the given reheat Rankine cycle.
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1. (10 points) Assume a timer that is designed with a prescaler. The prescaler is configured with 3 bits and the free-running counter has 16 bits. The timer counts timing pulses from a clock whose frequency is 8 MHz. A capture signal from the processor latches a count of 4D30 in hex. Find out how much time was elapsed since the last reset to the free counter.
Therefore, the time elapsed since the last reset to the free counter is simply 19,856 µs or 19.856 ms.
Assuming a timer that is designed with a prescaler, the prescaler is configured with 3 bits, and the free-running counter has 16 bits.
The timer counts timing pulses from a clock whose frequency is 8 MHz, a capture signal from the processor latches a count of 4D30 in hex. The question is to find out how much time elapsed since the last reset to the free counter.
To find out the time elapsed since the last reset to the free counter, you need to determine the time taken for the processor to capture the signal in question.
The timer's count frequency is 8 MHz, and the prescaler is configured with 3 bits.
This means that the prescaler value will be 2³ or 8, so the timer's input frequency will be 8 MHz / 8 = 1 MHz.
As a result, the timer's time base is 1 µs. Since the free counter is 16 bits, its maximum value is 2¹⁶ - 1 or 65535.
As a result, the timer's maximum time measurement is 65.535 ms.
The captured signal was 4D30 in hex.
This equates to 19,856 decimal or
4D30h * 1 µs = 19,856 µs.
To obtain the total time elapsed, the timer's maximum time measurement must be multiplied by the number of overflows before the captured value and then added to the captured value.
Since the captured value was 19,856, which is less than the timer's maximum time measurement of 65.535 ms, there were no overflows.
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Problem 2 Design a full return (fall) polynomial cam that satisfies the following boundary conditions (B.C): At 0=0°, y= h, y'= 0,4" = 0 = At 0= 5, y = 0, y = 0,4" = 0
A full return polynomial cam that satisfies the given boundary conditions can be designed by utilizing a suitable polynomial equation. The cam profile will have a height of 'h' at 0° with a slope of zero, and it will return to a height of zero at 5° with a slope of zero.
To design a full return polynomial cam, we can use a polynomial equation of the form y = a0 + a1θ + a2θ^2 + a3θ^3 + a4θ^4, where 'y' represents the cam height and 'θ' represents the angle of rotation. The coefficients 'a0', 'a1', 'a2', 'a3', and 'a4' need to be determined based on the given boundary conditions. At 0°, the cam height is 'h' and the slope is zero, which means y = h and y' = 0. Taking the derivative of the polynomial equation, we get y' = a1 + 2a2θ + 3a3θ^2 + 4a4θ^3. Setting θ = 0, we have a1 = 0. Since the slope should be zero, we can set a2 = 0 as well. At 5°, the cam height is zero and the slope is zero. Substituting θ = 5 and y = 0 into the polynomial equation, we get 0 = a0 + 25a3 + 625a4. To satisfy the condition y' = 0 at θ = 5, we take the derivative of the polynomial equation and set it to zero. This leads to a3 = -16a4. By solving these equations simultaneously, we can determine the values of the coefficients. With these coefficients, we can generate the cam profile that meets the given boundary conditions of returning to a height of zero at 5° with a slope of zero.
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In a boat race , boat A is leading boat B by 38.6m and both boats are travelling at a constant speed of 141.6 kph. At t=0, the boats accelerate at constant rates. Knowing that when B passes A, t=8s and boat A is moving at 220.6 kph, determine the relative position (m) of B with respect to A at 13s. Round off only on the final answer expressed in 3 decimal places.
Given:Initial separation between Speed of Boat A and Boat Time when Boat B passes Speed of Boat A at Acceleration of Boat A and Boat Relative position of B with respect to We know that: Relative position distance travelled by Boat B - distance travelled by Boat Aat time, distance travelled by Boat mat time, distance travelled .
When Boat B passes A, relative velocity of Boat B w.r.t. This is because, Boat B passes A which means A is behind BNow, relative velocity, Relative position of Relative position distance travelled by Boat B distance travelled by Boat Let's consider the distance is in the +ve direction as it will move forward (as it is travelling in the forward direction).
The relative position is the distance of boat B from A.The relative position of B w.r.t. A at t = 13 s is 1573.2 + 12.5a m. Now we will put Hence, the relative position of B w.r.t. A at t = 13 s is 1871.167 m.
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If the coefficient of kinetic friction between the 50-kg crate and the ground is .3, determine the distance the crate travels and its velocity when t=3s. The crate starts from rest and P=200N. P(the force) is being pulled 30 degrees from the horizontal to the right from the right side of the box
The distance traveled by the crate when t=3s is approximately 0.786 meters, and its velocity at that time is approximately 1.572 m/s.
Resolve the applied force P=200N into its horizontal and vertical components. Since the force is being pulled 30 degrees from the horizontal to the right, the horizontal component is P_horizontal = P * cos(30°).
P_horizontal = 200N * cos(30°) ≈ 173.2N
The frictional force F_friction can be calculated using the equation F_friction = μ * F_normal, where μ is the coefficient of kinetic friction and F_normal is the normal force acting on the crate. The normal force is equal to the weight of the crate, which is given by F_normal = m * g, where m is the mass of the crate (50 kg) and g is the acceleration due to gravity (9.8 m/s²).
F_normal = 50 kg * 9.8 m/s² = 490N
F_friction = 0.3 * 490N = 147N
The net force acting on the crate in the horizontal direction is the difference between the applied force and the frictional force. Therefore, the net force is F_net = P_horizontal - F_friction.
F_net = 173.2N - 147N = 26.2N
Using Newton's second law, F_net = m * a, we can solve for the acceleration.
a = F_net / m = 26.2N / 50 kg ≈ 0.524 m/s²
Using the kinematic equation, x = x_0 + v_0t + (1/2)at², we can calculate the distance traveled by the crate. Here, x_0 represents the initial position, which is 0 in this case, v_0 represents the initial velocity, which is 0 since the crate starts from rest, t is the time (3s), and a is the acceleration.
x = 0 + 0 + (1/2)(0.524 m/s²)(3s)²
x ≈ 0 + 0 + 0.786 m = 0.786 m
Therefore, the distance traveled by the crate when t=3s is approximately 0.786 meters.
To find the velocity of the crate at t=3s, we can use the equation v = v_0 + at, where v_0 is the initial velocity (0) and a is the acceleration.
v = 0 + (0.524 m/s²)(3s)
v = 1.572 m/s
Therefore, the velocity of the crate at t=3s is approximately 1.572 m/s.
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A unity feedback system whose forward transfer function is given by the following expression: G(s)= ((8S+16) (S+24))/(S³+6S²+245) Determine the steady-state error when applying each of the three units standard test input signals (Step, ramp, and parabolic).
The steady-state errors for the three standard input signals are: ess(step input) = 1ess(ramp input) = ∞ess(parabolic input) = ∞
The transfer function of the unity feedback system is, G(s)= ((8S+16) (S+24))/(S³+6S²+245)
The steady-state error of a unity feedback system is calculated with the help of final value theorem.
A unit step input signal has a Laplace Transform of 1/s.
A unit ramp input signal has a Laplace Transform of 1/s²
.A unit parabolic input signal has a Laplace Transform of 2/s³
.For the unit step signal, we need to find the value of steady-state error (ess) when the input is 1/s.ess = 1/(1+Kp)
where Kp is the position error constant.Kp = lims→0(s×G(s)) = lims→0(s ×((8S+16) (S+24))/(S³+6S²+245))= 0
Kp = 0. So, ess = 1/1 = 1
For the unit ramp signal, we need to find the value of steady-state error (ess) when the input is 1/s².ess = 1/Kv
where Kv is the velocity error constant.Kv = lims→0(s×G(s)) = lims→0(s ×((8S+16) (S+24))/(S³+6S²+245))= 0
Kv = 0. So, ess = 1/0 = ∞ (infinite)
For the unit parabolic signal, we need to find the value of steady-state error (ess) when the input is 2/s³.ess = 1/Ka, where Ka is the acceleration error constant.
Ka = lims→0(s×G(s)) = lims→0(s ×((8S+16) (S+24))/(S³+6S²+245))= 0
Ka = 0. So, ess = 1/0 = ∞ (infinite).
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How important to evaluate the lateral earth pressure?
Lateral earth pressure evaluation is important because it ensures safety and stability in geotechnical engineering.
What is lateral earth pressure?
Lateral earth pressure is the force exerted by soil on an object that impedes its movement.
The force is created as a result of the soil's resistance to being deformed laterally and is proportional to the soil's shear strength.
It's crucial to assess the lateral earth pressure in various geotechnical engineering contexts because it affects the stability of a structure's foundation.
What are the benefits of evaluating lateral earth pressure?
Here are some of the benefits of evaluating lateral earth pressure:
Safety and stabilityThe safety and stability of a structure's foundation are important factors to consider when evaluating lateral earth pressure.
Failure to assess lateral earth pressure can result in a foundation collapse that can cause significant damage to a structure and put people's lives in danger.
Cost-effectiveIt's important to evaluate lateral earth pressure because it can help save money by avoiding overdesign or under-design of a foundation. Proper evaluation of lateral earth pressure ensures that a foundation's design matches the project's requirements.
Precise foundation designA precise foundation design is one of the benefits of evaluating lateral earth pressure. Proper foundation design is crucial because it can prevent foundation failure that can lead to significant financial losses.
It's also essential to consider the lateral earth pressure when designing the foundation of tall structures to avoid lateral instability.
So, lateral earth pressure evaluation is important in ensuring safety, cost-effectiveness, and stability in geotechnical engineering.
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Five miners must be lifted from a mineshaft (vertical hole) 100m deep using an elevator. The work required to do this is found to be 341.2kJ. If the gravitational acceleration is 9.75m/s^2, determine the average mass per person in kg.
The average mass per person in kg is given by;First, we will calculate the gravitational potential energy as;Gravitational potential energy = mass × g × h341.2 × 1000 = mass × 9.75 × 100
mass = (341.2 × 1000) / (9.75 × 100)mass = 350.26 kg
Therefore, the average mass per person in kg is 70.05 kg.
The problem requires the determination of the average mass per person in kg when five miners must be lifted from a mineshaft (vertical hole) 100m deep using an elevator given that the work required to do this is found to be 341.2kJ, and the gravitational acceleration is 9.75m/s^2. The gravitational potential energy is calculated as the product of mass, acceleration due to gravity, and height. Solving the expression, the mass of the five miners is found to be 350.26 kg. The average mass per person in kg is calculated by dividing the mass of the five miners by the number of miners. Thus, the average mass per person in kg is 70.05 kg.
The average mass per person in kg is 70.05 kg.
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Consider the interval (measured depth) from 10,850 to 10,860 on the Bonanza #1 wireline logs (at the end of the sheet). a) Read and record the porosity from the neutron log (dashed curve). b) Calculate the porosity from the sonic travel time, assuming that the matrix is sandstone and that the pore space is saturated with water. Compare and discuss relevant differences with the neutron porosity value from part a above. Assume travel time for water is 189.0 µs/ft.
c) Calculate the porosity from the density log (solid curve), assuming the matrix is sandstone and the pore space is saturated with water. d) Calculate the porosity from the density log assuming that the matrix is sandstone and the pore space is half filled with water (density of 1.1 g/cm³), and half filled with gas (density of 0.25 g/cm³). Discuss differences from the density porosity calculated from part c above.
e) Which of these logs (parts a-c) can be used to determine total porosity, and which can be used to determine effective porosity?
a) porosity = 31.5%. b) Sonic travel time porosity = 67%. c) porosity = 19%. d) porosity calculated from the density log = 41%. e) The neutron log can be used to determine total porosity.
a) The porosity from the neutron log is 31.5%.
b) Let us first define the formula for the calculation of porosity:
Porosity, Φ = (Tma - Tlog) / Tma
Where,
Tma is the travel time through the matrix
Tlog is the travel time through the formation
Here, travel time for water is 189.0 µs/ft.
The sonic log shows the reading of 62 µs/ft.
Hence, the travel time through the formation is given by;
Tlog = 62 µs/ft * 10 ft
= 620 µs
Similarly, the matrix travel time is calculated using the equation,
Tma = 189.0 µs/ft * 10 ft
= 1890 µs
Therefore,
Φ = (1890 - 620) / 1890
= 0.67 or 67%
The porosity calculated from the sonic log is much higher than that calculated from the neutron log.
c) The porosity from the density log is given by the formula;
Porosity, Φ = (ρma - ρb) / (ρma - ρf)
Where,ρma is the bulk density of the matrixρb is the bulk density of the rock formationρf is the density of the fluid
Here, matrix is sandstone and the pore space is saturated with water.
Therefore,
ρma = 2.65 g/cm³
ρf = 1.0 g/cm³
ρb = 2.3 g/cm³
Hence,
Φ = (2.65 - 2.3) / (2.65 - 1)
= 19%
d) The porosity calculated from the density log assuming that the matrix is sandstone and the pore space is half filled with water (density of 1.1 g/cm³), and half filled with gas (density of 0.25 g/cm³) is given by;
Φ = [(0.5 x (2.65 - 2.3)) + (0.5 x (2.65 - 0.25))] / (2.65 - 1)
Φ = 41%
The difference between the porosity calculated from the density logs is due to the presence of gas in the pore space. The density log cannot differentiate between gas and liquid, so it calculates the porosity based on the average density of the fluids.
e) The neutron log can be used to determine total porosity while the density and sonic logs can be used to determine effective porosity.
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(b) In addition, provide the cycle time for each worker in his/her sub-cell below. Then indicate the overall cycle time of your design (7 pts) Worker A's cycle time is: 160 _s/pc Worker B's cycle time is: 160 s/pc Worker C's cycle time is: 160 s/pc If 4 workers are defined, then, Worker D's cycle time is: s/pc Looking into the cell as a whole, what is the cycle time of the system with your design?: 100 s/pc With your design, how many garments will be produced per day (one shift)? per day The daily demand is 15 garments/day, are you meeting the demand? (Yes or NO
Worker A's cycle time is 160 s/pc, Worker B's cycle time is 160 s/pc, and Worker C's cycle time is 160 s/pc.
If 4 workers are defined, Worker D's cycle time is yet to be specified. **The cycle time of the system with my design is 100 s/pc**.
In the given scenario, the cycle time of each worker is 160 seconds per piece (s/pc). The overall cycle time of the system with my design is 100 s/pc. This means that the entire process, including the contributions of all the workers, takes 100 seconds to complete one garment.
To calculate the number of garments produced per day during one shift, we need to consider the working hours in a day. Assuming an 8-hour shift, which is standard, there are 28,800 seconds in a working day (8 hours × 60 minutes/hour × 60 seconds/minute).
To find the number of garments produced per day, we divide the total available time in seconds (28,800 s) by the cycle time of the system (100 s/pc):
28,800 s / 100 s/pc = 288 garments/day
The daily demand is 15 garments/day. Since the number of garments produced per day (288) exceeds the demand (15), **we are meeting the demand**.
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Consider a combined gas-steam power plant. Water for the steam cycle is heated in a well-insulated heat exchanger by the exhaust gases that enter at 800 K at a rate of 60 kg/s and leave at 400 K. Water enters the heat exchanger at 200 ∘ C and 8 MPa and leaves at 350 ∘ C and 8MPa. The exhaust gases are treated as air with constant specific heats at room temperature. What is the mass flow rate of water through the heat exchanger? Solve using appropriate software.
multiple choice question
a) 24kg/s
b)60kg/s
c)46kg/s
d)11kg/s
e)53kg/s
please show your work
C. The maximum amount an insurer will pay during the life of the insurance policy.
An aggregate limit refers to the maximum amount that an insurer is obligated to pay for covered losses or claims during the duration of an insurance policy. It represents the total limit or cap on the insurer's liability over the policy period, regardless of the number of incidents or claims that occur. Once the aggregate limit is reached, the insurer is no longer responsible for paying any further claims, even if they fall within the policy coverage.
It's important to note that once the aggregate limit is reached, the insurer's liability is exhausted, and they will no longer provide coverage for subsequent claims under that policy. In such cases, you may need to obtain additional coverage or seek alternative means of protection.
In summary, an aggregate limit represents the maximum amount an insurer will pay for covered claims or losses over the life of an insurance policy, encompassing multiple incidents or claims during that period.
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Fixture Inside Diameter = 49.29mm Air Inlet Area of Dryer = 61.65mm Elevation Difference Inlet/Outlet = 12.36mm Air exit temperature 35.15 °C Exit velocity = 4.9m/s Input Voltage = 240V Input Current=1.36A Average Temp. of Nozzle=25.5 °C Outside Diameter of Nozzle = 58.12mm Room Temperature = 23.5 °C Barometric Pressure = 101.325 Pa Length of Heated Surface = 208.70mm Density of exit air= 0.519 l/m^3 Mass flow rate=m= 0.157kg/s Change of enthalpy=317.14J This is A Simple Hairdryer Experiment to Demonstrate the First Law of Thermodynamics and the data provided are as seen above. Calculate the following A) Change of potential energy B) Change of kinetic energy C) Heat loss D) Electrical power output E) Total thermal power in F) Total thermal power out G) %error
The final answers for these values are: a) 0.00011 J, b) 0.596J, c) 1.828J, d) 326.56W, e) 150.72W, f) 148.89W, and g) 1.22%.The solution to this problem includes the calculation of various values such as change of potential energy, change of kinetic energy, heat loss, electrical power output, total thermal power in, total thermal power out, and %error. Below is the stepwise explanation for each value.
A) Change of potential energy= mgh= 0.157kg/s × 9.81m/s² × 0.01236m = 0.00011 J.
B) Change of kinetic energy= 1/2 × ρ × A × V₁² × (V₂² - V₁²) = 0.5 × 0.519 kg/m³ × 0.006406 m² × 0.076 × (4.9² - 0.076²) = 0.596 J.
C) Heat loss= m × cp × (t₁ - t₂) = 0.157 kg/s × 1.006 kJ/kg·K × (35.15 - 23.5) = 1.828 J.
D) Electrical power output= V × I = 240V × 1.36A = 326.56W.
E) Total thermal power in= m × cp × (t₂ - t_room) = 0.157 kg/s × 1.006 kJ/kg·K × (35.15 - 23.5) = 1.828 J.
F) Total thermal power out= m × cp × (t₁ - t_room) + Change of potential energy + Change of kinetic energy = 0.157 kg/s × 1.006 kJ/kg·K × (25.5 - 23.5) + 0.00011J + 0.596J = 148.89 W.
G) %error= ((Thermal power in - Thermal power out) / Thermal power in) × 100% = ((150.72W - 148.89W) / 150.72W) × 100% = 1.22%.
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An aircraft is flying at an indicated airspeed of 223 kts and Mach 0.65. Calculate the Equivalent airspeed in kts. Enter only the numerical part of your answer in the box below, in kts to the nearest integer.
Equivalent airspeed (EAS) is the airspeed at sea level in the International Standard Atmosphere at which the dynamic pressure is the same as the dynamic pressure at the true airspeed (TAS) and altitude at which the aircraft is flying.
EAS is used to determine the aerodynamic forces on the aircraft. Mach Number is the ratio of the true airspeed to the speed of sound. Indicated airspeed is the airspeed which is directly measured by the instruments. Mach number, M = True Airspeed / Speed of Sound At sea level, the speed of sound is 661.8 knots (TAS), 340.3 m/s (IAS), or 1116.4 fps (CAS).
True airspeed (TAS) = Indicated airspeed (IAS) x correction factor Correction factor = √(density ratio)EAS = TAS * correction factor [tex]EAS = IAS * √(density ratio)[/tex] Given, Indicated airspeed, IAS = 223 knots Mach number, M = 0.65
[tex]Density ratio = ρ/ρ0ρ = (1 + 0.2M^2)^3.5ρ0 = density[/tex]
at standard sea level,
[tex]1.225 kg/m³(1 + 0.2M^2)^3.5 = (1 + 0.2 * 0.65^2)^3.5 = 1.4985ρ = 1.4985 * 1.225 = 1.833 kg/m³[/tex]
[tex]Correction factor = √(density ratio) = √1.4985 = 1.2241EAS = IAS * √(density ratio) = 223 * 1.2241 ≈ 272[/tex]
The equivalent airspeed in knots (to the nearest integer) is 272 knots.
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Discuss any tow advantages of superposition theorem.
Superposition theorem is a fundamental principle used to analyze the behavior of linear systems. It states that the effect of two or more voltage sources in a circuit can be individually analyzed and then combined to find the total current or voltage in the circuit. This theorem offers several advantages, two of which are discussed below.
Advantages of Superposition theorem:
1. Ease of analysis:
The Superposition theorem simplifies analysis of complex circuits. Without this theorem, analyzing a complex circuit with multiple voltage sources would be challenging. Superposition allows each source to be analyzed independently, resulting in simpler and easier calculations. Consequently, this theorem saves considerable time and effort in circuit analysis.
2. Applicability to nonlinear circuits:
The Superposition theorem is not limited to linear circuits; it can also be used to analyze nonlinear circuits. Nonlinear circuits are those in which the output is not directly proportional to the input. Despite the nonlinearity, the theorem's principle holds true because the effects of all sources are still added together. By applying the principle of superposition, the total output of the circuit can be determined. This versatility is particularly useful in practical circuits, such as radio communication systems, where nonlinear elements are present.
In conclusion, the Superposition theorem offers various advantages, including ease of analysis and applicability to nonlinear circuits. Its ability to simplify circuit analysis and handle nonlinearities makes it a valuable tool in electrical engineering and related fields.
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URGENT. ANSWER ALL PLEASE :) WILL GIVE THUMBS UP!
Question 13 6 pts A 0.04 m³ tank contains 13.7 kg of air at a temperature of 190 K. Using the van de Waal's equation, what is the pressure inside the tank? Express your answer in kPa. Question 15 6 pts The actual Rankine cycle has an 87.03% turbine isentropic efficiency and 80.65% pump isentropic efficiency. If in the ideal Rankine cycle, the heat input in the boiler = 900 kW, the turbine work output = 392 kW, and pump work input = 19 kW, what is the actual cycle thermal efficiency if the heat input in the boiler is the same for the actual cycle? Express your answer in percent. Question 14 6 pts 3.4 kg/s of carbon dioxide undergoes a steady flow process. At the inlet state, the reduced pressure is 2 and the reduced temperature is 1.3. At the exit state, the reduced pressure is 3 and the reduced temperature is 1.7. Using the generalized compressibility and correction charts, what is the rate of change of total enthalpy for this process? Use cp = 0.978 kJ/kg K. Express your answer in kW. Question 17 6 pts In a reheat cycle with one stage of reheat, the steam leaving the high-pressure turbine is reheated before it enters the low-pressure turbine. For the ideal cycle, the heat input in the boiler is 898 kW, the high-pressure turbine work output is 142 kW, the low-pressure turbine work output is 340 kW, and the input work to the pump is 15 kW. If the efficiency of the ideal reheat cycle is 36.5%, what is the heat transfer in the condenser? Express your answer in kW.
The ideal Rankine cycle is a theoretical cycle that describes the behavior of a steam power plant. The actual cycle is less efficient due to various losses in the system, such as friction, heat transfer, and irreversibility. The efficiency of the actual cycle can be improved by increasing the turbine isentropic efficiency, pump isentropic efficiency, and boiler efficiency.
Question 13A 0.04 m³ tank contains 13.7 kg of air at a temperature of 190 K. Using the van de Waal's equation, the pressure inside the tank can be calculated as follows:
Given data,Volume = 0.04 m³n = ?R = 8.31 J/K.molT = 190 Km = 13.7 kgMolar mass of air = 28.97 g/mol = 0.02897 kg/molVan der Waals equation isP = (nRT) / (V-nb) - a(n/V)²For air, a = 0.1385 Pa.m³/mol, and b = 0.0000385 m³/molWe need to calculate n = m / M = 13.7 kg / 0.02897 kg/mol = 473.06 mol.Now calculate pressure P = ?P = (nRT) / (V-nb) - a(n/V)²Putting the values we getP = ((473.06 mol) x (8.31 J/mol.K) x (190 K)) / ((0.04 m³)-(473.06 mol x 0.0000385 m³/mol)) - 0.1385 Pa.m³/mol x ((473.06 mol) / (0.04 m³))²= 19024 Pa, rounded to 19.0 kPaTherefore, the pressure inside the tank is 19.0 kPa.
ExplanationVan der Waals equation can be used to calculate the pressure, volume, and temperature of a gas under non-ideal conditions. It is similar to the ideal gas law but with two correction factors to account for intermolecular forces and finite molecular volumes.Question 15
The ideal Rankine cycle can be represented on a temperature-entropy diagram as follows:
Given data,Heat input in the boiler = 900 kWTurbine work output = 392 kWPump work input = 19 kWEfficiency of the actual cycle = 87.03%Efficiency of the pump = 80.65%Efficiency of the actual cycle = (Net work output / Heat input) x 100%Where,Net work output = Turbine work output - Pump work input
Net work output = (392 - 19) kW = 373 kWHeat input in the boiler = 900 kW
Efficiency of the actual cycle = (373 / 900) x 100% = 41.44%
Therefore, the actual cycle thermal efficiency is 41.44%.
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2) A piston-cylinder assembly is thermally insulated. There is saturated liquid water at 120°C with a mass of 1.8 kg. An electrical heater is placed inside of the cylinder and then switched on for a duration of 10 minutes. During this time, the volume of the cylinder increases by four times. Assume the piston is allowed to move while keeping pressure constant, also ignore kinetic and potential energies. Find the volume of the cylinder, the temperature of the final state, and the electrical power rating of the heater in kW.
Given:Mass of saturated liquid water = 1.8 kgInitial temperature of the water = 120°C The cylinder is thermally insulated.The piston is allowed to move while keeping the pressure constant.
The volume of the cylinder increases four times in 10 minutes.Ignore kinetic and potential energies.Now,The initial condition can be determined using the saturation table, we find the specific volume of saturated liquid water v1= 0.001074 m3/kg.
The initial volume of water in the cylinder will be V1 = m/v1 = 1.8/0.001074 = 1674.77 cm3 = 1.67477 LThe volume of the cylinder during the process is 4 V1 = 6.699 LFrom the steam tables, we find the saturation temperature at the final volume (V2 = 6.699 L) and find it to be 193.65°C.So, 193.65°C is the final temperature.
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The G Command in Moving From Point 7 to Point 8, the Tool Diameter is .375" . USE THE TOOL CENTER PROGRAMMING APPROACH
A) G01 X.8660 Y-3.1875
B) G01 X.500 Y-3.00
C) G01 X.8175 Y-3.00
D) G01 X.8157 Y-3.1875
Given that the tool diameter is 0.375". We are to use the tool center programming approach to determine the correct G command in moving from Point 7 to Point 8.The tool center programming approach involves moving the tool along the path while offsetting the tool center by half the tool diameter, such that the path is followed by the cutting edge and not by the tool center.
Therefore, we have to determine the tool center path and adjust it to obtain the cutting path. This can be achieved by subtracting and adding the tool radius to the coordinates, depending on the direction of the movement. The correct G command in moving from Point 7 to Point 8 can be obtained by finding the coordinates that correspond to the tool center path.
Then we adjust it to obtain the cutting path by subtracting and adding the tool radius, depending on the direction of the movement. We can use the following steps to determine the correct G command. Step 1: Determine the tool center path coordinates. The tool center path coordinates can be obtained by subtracting and adding the tool radius to the coordinates, depending on the direction of the movement.
Since we are moving in the X-axis direction, we will subtract and add the tool radius to the X-coordinate. Therefore, the tool center path coordinates are: X = 0.8157 + 0.1875 = 1.0032 (for Point 8)X = 0.8660 + 0.1875 = 1.0535 (for Point 7)Y = -3.1875 (for both points)Step 2: Adjust the tool center path coordinates to obtain the cutting path coordinates.
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draw and briefly explain cost comparison diagram which
allows comparison of the cost to fabricate composite products
When it comes to fabricating composite products, there are a number of methods that can be used. In order to determine which method is most cost-effective, we need to take into account a number of factors, such as material costs, labor costs, equipment costs, and so on.
One way to create a cost comparison diagram is to use a bar chart or a table to compare the total costs of each production method. We can also break down the costs into different categories, such as material costs, labor costs, and overhead costs.Here's an example of a cost comparison diagram for fabricating composite products:
[tex]| Production Method | Material Cost | Labor Cost | Equipment Cost | Total Cost || ---------------- | ------------ | ---------- | -------------- | ---------- || Hand Layup | $10,000 | $25,000 | $5,000 | $40,000 || Filament Winding | $12,000 | $20,000 | $10,000 | $42,000 || Resin Infusion | $15,000 | $30,000 | $15,000 | $60,000 |[/tex]
As we can see from the table above, the hand layup method is the most cost-effective, with a total cost of $40,000. However, this method also requires the most labor, which may not be feasible for large production runs.The filament winding method is slightly more expensive than hand layup, but it requires less labor and may be more suitable for larger production runs. Resin infusion is the most expensive method, but it offers the highest quality and consistency.
Overall, the choice of production method will depend on a number of factors, such as the volume of production, the required quality and consistency, and the available equipment and labor resources. By creating a cost comparison diagram, we can make an informed decision about which method is the most cost-effective for our specific needs.
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Which gate has its output equal 0 if and only if both inputs are 0 Select one: a. \( \mathrm{OR} \) b. AND c. NOT d. NAND
d. NAND gates have their output equal to 0 if and only if both inputs are 0; for all other input combinations, the output is 1.
The NAND gate, short for "NOT-AND," is a logic gate that performs the combination of an AND gate followed by a NOT gate. It has two inputs and one output. The output of a NAND gate is the logical negation of the AND operation performed on its inputs.
In the case of the NAND gate, if both inputs are 0 (logic low), the AND operation results in 0. Since the NAND gate also performs a logical negation, the output becomes 1 (logic high). However, for any other combination of inputs (either one or both inputs being 1), the AND operation results in 1, and the NAND gate's logical negation flips the output to 0.
The NAND gate has an output equal to 0 only when both of its inputs are 1. In all other cases, when at least one input is 0 or both inputs are 0, the NAND gate produces an output of 1. Therefore, the NAND gate has its output equal to 0 if and only if both inputs are 0.
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A venturi meter is installed in a vertical pipeline system in which petroleum c flows in an upward direction through it. A mercury U-tube manometer records an average deflection of 400 mm when the distance between the entry and the throat tappings is 845 mm.
The throat diameter is 200 mm and the pipe diameter is 450 mm. The flow coefficient for the meter is 0.945 and the relative density of the petroleum oil is 0.85
Calculate:
The velocity of flow ratio between the 450 mm diameter pipe section to the 200 mm throat section
The change in pressure between the 450 mm diameter pipe section and the 200 mm throat section in kPa
The velocity of the petroleum oil of at the throat section in m/s with the aid of Bernoulli's energy equation ignoring all losses
The actual volumetric flow rate of the petroleum oil through the venturi flowmeter in litres per minute
The venturi meter is installed in a vertical pipeline system in which petroleum oil flows in an upward direction through it.
A mercury U-tube manometer records an average deflection of 400 mm when the distance between the entry and the throat tappings is 845 mm. The throat diameter is 200 mm and the pipe diameter is 450 mm. The flow coefficient for the meter is 0.945 and the relative density of the petroleum oil is 0.85.
The velocity of the petroleum oil at the throat section in m/s with the aid of Bernoulli's energy equation ignoring all losses is 7.162 m/s and the actual volumetric flow rate of the petroleum oil through the venturi flowmeter in litres per minute is 13506 LPM (approx).
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Explain the operation of a sample-hold in an ADC.
A sample and hold (S/H) device is used in an ADC (analog-to-digital converter) to store the analog input voltage for a specified amount of time before the converter measures it. S/H samples the analog signal, holds it, and then converts it into a digital signal.
The sample and hold operation is used in an ADC to preserve the amplitude of the input signal for a certain amount of time, allowing it to be measured more precisely. The first part of an ADC, the sample, holds a voltage and stores it temporarily until the second part, the ADC, is ready to measure it.The sample and hold circuit usually comprises of an input, an output, a switch, and a capacitor. A voltage that represents the analog signal is supplied to the input. The switch is turned on by the clock pulse, allowing the capacitor to store the voltage that the input circuit received.
The output signal is now a voltage that is held constant, unaffected by the changes in the input signal while it is held. The voltage stored on the capacitor is held until the next clock cycle, at which point the switch turns off and the capacitor is disconnected from the input signal. The input signal voltage now passes through the amplifier, which generates the output voltage.
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A trapezoidal channel of bed width 10.0 m, side slope 3:2, longitudinal bed slope 10 cm/km, mean velocity 0.594 m/s, and Manning's coefficient 0.025. Determine: a) The average boundary shear stress acting on the channel wetted perimeter. b) The maximum boundary shear stress on the bed and sides. c) If the mean diameter of the material forming the channel bed and sides is 0.4 mm and the angle of repose is 35º, what is the maximum discharge that can pass in this channel without causing scour?
Bed width = 10.0 m Side slope = 3:2Longitudinal bed slope = 10 cm/km Mean velocity = 0.594 m/s Manning's coefficient = 0.025The formula for average boundary shear stress is:τb = (γ × R × S) / nwhere,γ = unit weight of waterR = hydraulic radius S = longitudinal bed slope n = Manning's coefficienta) The calculation of average boundary shear stress:
We can find the hydraulic radius using the given data. It is given by:R = (A / P)Where A is the cross-sectional area of the flow and P is the wetted perimeter of the channel. Here, the channel is trapezoidal. Therefore, A can be calculated using the formula:A = (b1 + b2) / 2 × ywhere b1 and b2 are the bottom widths of the trapezoidal channel and y is the depth of flow. P can be calculated using the formula:P = b1 + b2 + 2 × (y / sinθ)where θ is the angle between the horizontal and the side slope. Using the given data, we have:b1 = 10.0 mb2 = 3/2 × 10.0 = 15.0 my/s = 0.594 m/sn = 0.025S = 10 cm/kmγ = 9.81 kN/m³Now, we can use the values to calculate R as follows:Depth of flow:y = (4 / 3) × (b1 + b2) / (2 + 3) = 6.86 mCross-sectional area:A = (10.0 + 15.0) / 2 × 6.86 = 96.78 m²Wetted perimeter:P = 10.0 + 15.0 + 2 × (6.86 / sin(53.13º)) = 41.22 m Hydraulic radius:R = 96.78 / 41.22 = 2.345 mNow, we can calculate the average boundary shear stress.τb = (γ × R × S) / nτb = (9.81 × 2.345 × 0.1) / 0.025τb = 93.99 N/m²Therefore, the average boundary shear stress is 93.99 N/m².b) The calculation of the maximum boundary shear stress:We can use the following formula to calculate the maximum boundary shear stress:τmax = τb × Kcwhere Kc is the coefficient of contraction and its value is usually between 0.2 and 0.6.
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A pressure gauge is calibrated from 0 to 800 kg/cm². it's a accuracy is specified as within 1% of the full scale value, in the first 20% of the scale reading and 0.5% in the remaining 80% of the scale reading. What static error expected if the instrument indicates: a. a)130 kg/cm² b) 320 kg/cm² [P 2.22] [E 4.2]
a. The static error expected for an indication of 130 kg/cm² on the pressure gauge is approximately 2.6 kg/cm².
b. The static error expected for an indication of 320 kg/cm² on the pressure gauge is approximately 1.6 kg/cm².
The pressure gauge has a specified accuracy that varies depending on the scale reading. For the first 20% of the scale reading, the accuracy is within 1% of the full scale value, while for the remaining 80% of the scale reading, the accuracy is within 0.5% of the full scale value.
To calculate the static error, we need to determine the error limits for each range of the scale. For the first 20% of the scale reading (0 to 160 kg/cm² in this case), the error limit is 1% of the full scale value. Therefore, the error limit for this range is 1.6 kg/cm² (1% of 160 kg/cm²).
For the remaining 80% of the scale reading (160 to 800 kg/cm² in this case), the error limit is 0.5% of the full scale value. Therefore, the error limit for this range is 3.2 kg/cm² (0.5% of 640 kg/cm²).
For the given indications, we can compare them to the scale ranges and determine the corresponding error limits. For an indication of 130 kg/cm² (within the first 20% of the scale), the static error expected would be approximately 2.6 kg/cm² (1% of 160 kg/cm²). Similarly, for an indication of 320 kg/cm² (within the remaining 80% of the scale), the static error expected would be approximately 1.6 kg/cm² (0.5% of 320 kg/cm²).
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A rigid tank contains 6 kg of saturated vapor steam at 100°C. The steam is cooled to the ambient temperature of 25°C. Determine the entropy change of the steam, in kJ/K. Use steam tables.
The entropy change of the steam is ___kJ/K
Given data are:Mass of steam m = 6kgTemperature of steam T1 = 100 °CTemperature of surrounding T2 = 25°CWe need to find entropy change of steam ∆S
.From steam table, we have:At 100°C, saturation pressure P1 = 1.013 bar Specific enthalpy of saturated vapour h1 = 2676.5 kJ/kgSpecific entropy of saturated vapour s1 = 6.828 kJ/kg KAt 25°C, saturation pressure P2 = 0.031 bar Specific enthalpy of saturated vapour h2 = 2510.1 kJ/kgSpecific entropy of saturated vapour s2 = 8.785 kJ/kg KThe entropy change of the steam is -0.116 kJ/K
In order to find the entropy change of steam, we will use the entropy formula. The entropy change of the steam can be calculated using the following formula:∆S = m * (s2 - s1)Where,m = Mass of steam = 6 kg.s1 = Specific entropy of saturated vapour at temperature T1.s2 = Specific entropy of saturated vapour at temperature T2.s1 and s2 values are obtained from steam tables.At 100°C,s1 = 6.828 kJ/kg KAt 25°C,s2 = 8.785 kJ/kg KNow, substituting the values in the formula, we get∆S = 6 * (8.785 - 6.828) = -0.116 kJ/KSo, the entropy change of the steam is -0.116 kJ/K.
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The entropy change of the steam is -40.902 kJ/K
How to determine the entropy changeUsing the steam tables, we have that the specific entropy values are;
At 100°C, the specific entropy of saturated vapor steam is s₁= 7.212 kJ/(kg·K).
At 25°C, the specific entropy of saturated liquid water is s₂= 0.395 kJ/(kg·K).
The formula for entropy change (Δs) is given as;
Δs = s₂ - s₁
Substitute the values from the steam table, we get;
Δs = 0.395 - 7.212
subtract the values
Δs = -6.817 kJ/(kg·K)
To calculate the total entropy change, we have;
Entropy change = Δs × mass
= -6.817 kJ/(kg·K) × 6 kg
Multiply the values
= -40.902 kJ/K
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