The axial Coefficient of Performance (COP) of the cycle is 20.25.
a) Hardware diagram:The components of a heat pump cycle can be classified into two main groups: primary components and secondary components. The primary components are the ones that circulate the refrigerant throughout the cycle, while the secondary components are the ones that circulate the heat. Primary components:1- Compressor: The compressor is responsible for compressing the low-pressure refrigerant vapor and raising its temperature and pressure.
2- Condenser: The condenser is responsible for rejecting heat from the hot, high-pressure refrigerant vapor to the cold surroundings.3- Expansion Valve: The expansion valve is responsible for lowering the temperature and pressure of the refrigerant liquid-vapor mixture.4- Evaporator: The evaporator is responsible for absorbing heat from the cold surroundings by boiling the refrigerant liquid-vapor mixture.Secondary components:5- Cold source: This is the object that is being cooled by the heat pump.
The refrigerant is subcooled by 5°C, which means it is at the state (3a) on the chart. From the chart, the enthalpy at state (3a) is h3a = 450 kJ/kg. Since the refrigerant is subcooled, we can use the following equation to find the specific enthalpy at state (3):h3 = h3a - Cp(T3a - T3)where:Cp = Specific heat of refrigerant at constant pressure = 1.15 kJ/kg.KT3 = Temperature of refrigerant at station (3) = 20°C + 273.15 K = 293.15 KSubstituting the values, we get:h3 = 450 - 1.15(293.15 - (20 - 5 + 273.15))h3 = 423.5 kJ/kg.c) Coefficient of Performance (COP):The Coefficient of Performance (COP) of a heat pump is defined as the ratio of the heat output to the energy input.
For a heat pump cycle, the heat output is the heat transferred from the hot source to the cold source, while the energy input is the work input to the compressor.The heat transferred from the hot source to the cold source is given by:QH = m(dot)h2 - m(dot)h1where:m(dot) = Mass flow rate of refrigerantQH = Heat transferred from hot source to cold sourceh2 = Enthalpy at station (2)h1 = Enthalpy at station (1)Substituting the values, we get:QH = m(dot)(418.5 - 369.8)QH = 5m(dot) kJ/kg The work input to the compressor is given by:W = m(dot)(h2 - h1)/ηcwhere:ηc = Isentropic efficiency of compressor Substituting the values, we get:W = 5m(dot)(418.5 - 369.8)/0.85W = 247.06m(dot) kJ/kgThe Coefficient of Performance (COP) is given by:COP = QH/WSubstituting the values, we get:COP = 5m(dot)/(247.06m(dot))COP = 20.25
Therefore, the Coefficient of Performance (COP) of the cycle is 20.25.
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A 4-stroke SI ICE, with the following parameters: number of crankshaft rotations for a complete EG cycle, nr = 2 number of cylinders, nc = 4 cylinder bore, B = 82 mm piston stroke, S = 90 mm mean effective pressure, Pme = 5.16 bar engine speed, Ne = 2500 rpm fuel mass flow rate, m = 1.51 g/s
A 4-stroke SI (Spark Ignition) ICE (Internal Combustion Engine) is also known as a petrol engine, uses a spark plug to ignite the fuel.
The basic principle behind the 4-stroke engine is that a fuel-air mixture is ignited by spark plug, which forces the piston down the cylinder, resulting in mechanical energy. In this question, the parameters of the 4-stroke SI ICE are given as follows.
Nr = 2 (number of crankshaft rotations for a complete EG cycle)nc = 4 (number of cylinders)B = 82 mm (cylinder bore)S = 90 mm (piston stroke)Pme = 5.16 bar (mean effective pressure)Ne = 2500 rpm (engine speed)m = 1.51 g/s (fuel mass flow rate)In order to calculate the engine power.
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Close command In multline command close multiple lines by linking the last parts to the first pieces. False O True O
Multiline commands are those that stretch beyond a single line. They can span over multiple lines. This is useful for code readability and is widely used in programming languages. The "Close Command" is used in Multiline commands to close multiple lines by linking the last parts to the first pieces.
The given statement is False. Multiline commands often include a closing command, that signifies the end of the multiline command. This is to make sure that the computer knows exactly when the command begins and ends. This is done for the sake of code readability as well. Multiline commands can contain variables, functions, and much more. They are an essential part of modern programming.
It is important to note that not all programming languages have Multiline commands, while others do, so it depends on which language you are programming in. In conclusion, the statement "Close command In multline command close multiple lines by linking the last parts to the first pieces" is False.
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(c) (i) (ii) Choose a commercially successful type of biosensor and justify its importance to the society. Briefly outline your business plan for commercializing the selected biosensor.
A commercially successful type of biosensor and its importance to society. The glucose biosensor is an example of a commercially successful type of biosensor, which has found various applications in medical science and beyond.
The glucose biosensor is a tiny electrochemical device that can monitor blood sugar levels in real-time. This type of biosensor is critical for people living with diabetes because it allows them to manage their blood sugar levels more effectively.Apart from the immediate benefit of glucose biosensors for people with diabetes, they are also beneficial for medical practitioners who require accurate blood sugar level measurements in their diagnoses.
The following is an outline for a business plan that could be used to commercialize a biosensor:
Step 1: Defining the target market- Identify who the customers are and where they are located
Step 2: Creating a business model- Determine the product's value proposition and how it will generate revenue.
Step 3: Conducting market research- Analyze the target market, identify any potential competitors, and evaluate demand.
Step 4: Develop a marketing strategy- Determine the best way to reach the target market and promote the product.
Step 5: Identify funding sources- Determine how the product will be funded and secure financing.
Step 6: Finalize the product design- Ensure that the product meets customer needs and requirements.
Step 7: Launch the product- Begin selling the product and continue to monitor the market for changes or trends.
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A hydraulic reservoir pressurised to 12,5 kPa contains a fluid with a density of 960 kg/m³. The reservoir feeds a hydraulic pump with a flow rate of 10 l/s through a filter with a shock loss constant (k) of 4.
After the pump, there are two bends, each with a shock loss constant (k) of 0,85 and a selector valve with a length to diameter ratio of 60. The actuator requires a pressure of 4,25 MPa to operate. The actuator is located 6 m lower than the fluid level in the reservoir. A 30 mm diameter pipe of 15 m connects the components. The pipe has a friction coefficient of 0,015. Calculate: 6.2.1 The total length to diameter ratio of the system (ignore entrance loss to the pipe.) 6.2.2 The total head loss throughout the system
The total length to diameter ratio of the hydraulic system is calculated to be 421.
The total head loss throughout the system is determined to be 31.47 meters. The length to diameter ratio is a measure of the overall system's size and complexity, taking into account the various components and pipe lengths. In this case, it includes the reservoir, pump, bends, selector valve, and the connecting pipe. The head loss is the energy lost due to friction and other factors as the fluid flows through the system. It is essential to consider these values to ensure proper performance and efficiency of the hydraulic system.
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We are analyzing an engine piston and cylinder setup. If the crank AB has a constant clockwise angular velocity of 2000 rpm (rpm is rounds per minute – every one round is 2 radians – use that to convert rpm to radians per second), determine the forces on the connection rod at B and D. Assume BD to be a uniform, slender rod of mass 4 lbm. Piston P weights 5 lb. HINT: Draw the free body diagram of member BD just the same way as you did back in statics. Set up the force and moment equations. Find the reaction forces.
The forces acting on the member BD at point B and D are;FBX = 0DY = FBY/2FBY = 267.6 lbm
FY = 133.8 lbm
Given data Angular velocity of crank AB, ω = 2000 rpm
Angular velocity of crank AB in radian/sec = ω/60 * 2 π
= 2000/60 * 2 π
= 209.44 rad/s
Weight of piston, P = 5 lb
Weight of uniform slender rod, BD = 4 lb
We need to find out the forces on the connection rod at B and D.
The free body diagram of member BD is as shown below;
Free Body Diagram(FBD)Let FBX and FBY be the forces acting on the member BD at point B and DY and DX be the forces acting on member BD at point D.
The forces acting on member BD at point B and D are shown in the figure above.
Force equation along x-axis;FBX + DX = 0FBX = -DX -------------(1)
From the force equation along the y-axis;FBy + DY - P - BDg = 0FY = P + BDg - DY -------------(2)
Moment equation about D;DY * L = FBX * L / 2 + FBY * L / 2DY = FBX/2 + FBY/2 --------- (3)
Substituting (1) in (3)DY = FBY/2 - DX/2 ----------(4)
Substituting (4) in (2)FY = P + BDg - FBY/2 + DX/2 --------- (5)
Substituting (1) in (5);FY = P + BDg + FBX/2 + DX/2 ----------(6)
Equations (1) and (6) gives;FBX = -DXFY = P + BDg + FBX/2 + DX/2 ------(7)
Substituting the given values;FY = 5 + 4 * 32.2 + (-DX)/2 + DX/2FY = 5 + 4 * 32.2FY = 133.8 lbm
Substituting in (1);FBX = -DXFBX + DX = 0DX = 0FBX = 0
Hence, the forces acting on the member BD at point B and D are;FBX = 0DY = FBY/2FBY = 267.6 lbm
FY = 133.8 lbm
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show your calculations Question - Question 28 : A copper electrode is immersed in an electrolyte with copper ions and electrically connected to the standard hydrogen electrode. The concentration of copper ions in the electrolyte is O.5 M and the temperature is 3o'c. What voltage will you read on the voltmeter? A.E0.330 V B. 0.330 V0.350V
the voltage that will be read on the voltmeter is 0.355V.So, the correct option is C)
Given: Concentration of copper ions in the electrolyte = 0.5M
Temperature = 30°C
Copper electrode is immersed in the electrolyte
Electrically connected to the standard hydrogen electrode
To find: Voltage that will be read on the voltmeter
We know that, the cell potential of a cell involving the two electrodes is given by the difference between the standard electrode potential of the two electrodes, E°cell
The Nernst equation relates the electrode potential of a half-reaction to the standard electrode potential of the half-reaction, the temperature, and the reaction quotient, Q as given below: E = E° - (0.0591/n) log Q
WhereE° is the standard potential of the celln is the number of moles of electrons transferred in the balanced chemical equation
Q is the reaction quotient of the cellFor the given cell, Cu2+(0.5 M) + 2e- → Cu(s) E°red = 0.34 V (from table)
The half-reaction at the cathode is H+(1 M) + e- → ½ H2(g) E°red = 0 V (from table)
For the given cell, E°cell = E°Cu2+/Cu – E°H+/H2= 0.34 - 0= 0.34 V
The Nernst equation can be written as:
Ecell = E°cell – (0.0591/n) log QFor the given cell, Ecell = 0.34 - (0.0591/2) log {Cu2+} / {H+} = 0.34 - (0.02955) log (0.5 / 1) = 0.34 - (-0.01478) = 0.3548 ≈ 0.355 V
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A 6-mm diameter Sphere is droped into water. The weight of the ball and bouncy force exerted on the sphere equal 0.0011 N , respectively The density of water 1000 kg/m² Assume that the fluid flow Sphere lawinar and the aver the is drag coefficient remains Constant and equal 0.5 Delermine the terminal Velocity of the Sphere in water ? a) 0.266 mis -) 0-238 mis b) 0.206 mis d) 0.155 mis
The terminal velocity of the sphere in water is 0.206 m/s.
When a sphere of 6-mm diameter is dropped into water, its weight and bouncy force exerted on it are 0.0011 N, respectively. The density of water is 1000 kg/m³.
Assume that the fluid flow sphere is laminar and the average drag coefficient remains constant and equal 0.5. To find the terminal velocity of the sphere in water, we can use the Stokes' Law. It states that the drag force Fd is given by:
Fd = 6πηrv
where η is the viscosity of the fluid, r is the radius of the sphere, and v is the velocity of the sphere. When the sphere reaches its terminal velocity, the drag force Fd will be equal to the weight of the sphere, W. Thus, we can write:6πηrv = W = mgwhere m is the mass of the sphere and g is the acceleration due to gravity. Since the density of the sphere is not given, we cannot directly calculate its mass.
However, we can use the density of water to estimate its mass. The volume of the sphere is given by:
V = (4/3)πr³ = (4/3)π(0.003 m)³ = 4.52 × 10⁻⁸ m³
The mass of the sphere is given by:
m = ρVwhere ρ is the density of the sphere.
Since the sphere is denser than water, we can assume that its density is greater than 1000 kg/m³.
Let's assume that the density of the sphere is 2000 kg/m³. Then, we get:
m = 2000 kg/m³ × 4.52 × 10⁻⁸ m³ = 9.04 × 10⁻⁵ kg
Now, we can solve for the velocity v:
v = (2mg/9πηr)¹/²
Substituting the given values, we get:
v = (2 × 9.04 × 10⁻⁵ kg × 9.81 m/s²/9π × 0.5 × 0.0006 m)¹/²
v ≈ 0.206 m/s
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Draw the stress-strain curves of epoxy, polyethylene, and nitrile rubber
In conclusion, stress-strain curves are important to describe the mechanical behavior of materials. Epoxy is a rigid material, Polyethylene is highly flexible and nitrile rubber is tough and durable. The three materials have different stress-strain curves due to their unique properties and composition.
Stress-strain curves can be used to describe the mechanical behavior of materials. A stress-strain curve is a graph that represents a material's stress response to increasing strain. The strain values are plotted along the x-axis, while the stress values are plotted along the y-axis. It is used to evaluate the material's elasticity, yield point, and ultimate tensile strength.
Epoxy: Epoxy resins are high-performance resins with excellent mechanical properties and adhesive strength. Epoxy has a high modulus of elasticity and is a rigid material. When subjected to stress, epoxy deforms elastically at first and then plastically.
Polyethylene: Polyethylene is a thermoplastic polymer that is commonly used in various applications due to its excellent chemical resistance and low coefficient of friction. Polyethylene is highly flexible, and its stress-strain curve reflects this property. Polyethylene has a low modulus of elasticity, which means that it deforms easily under stress.
Nitrile rubber: Nitrile rubber is a synthetic rubber that is widely used in industrial applications. Nitrile rubber is tough and durable, and it can withstand high temperatures and chemicals. Nitrile rubber is elastic, and its stress-strain curve reflects this property. Nitrile rubber deforms elastically at first and then plastically.
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3. The filter section of a full wave bridge rectifier is a 5k2 resistor in parallel to a 25µF capacitor. 15 V peak voltage at 60 Hz is supplied to the rectifier. What is the expected output voltage?
A full wave bridge rectifier has 4 diodes and converts the alternating current into direct current. In the filter section of a full wave bridge rectifier, a 5k2 resistor is used in parallel with a 25µF capacitor. This is used to smooth the output voltage of the rectifier.
In order to calculate the expected output voltage, we need to first calculate the DC voltage across the filter section. The peak voltage supplied to the rectifier is 15 V, therefore the peak voltage across the filter section will be equal to 15 V as well.Next, we can use the formula to calculate the ripple voltage across the filter section. The formula is given as follows:Vr = I / (2 * f * C)Where Vr is the ripple voltage, I is the DC current through the filter section, f is the frequency of the AC input, and C is the capacitance of the capacitor used in the filter section.
We can assume that the DC current through the filter section is equal to the average current flowing through the rectifier. This can be calculated using the formula:I = (2 * Ip) / πWhere Ip is the peak current flowing through the rectifier. Since we know the peak voltage supplied to the rectifier, we can calculate the peak current using Ohm's law. Therefore,Ip = Vp / RlWhere Rl is the load resistance. We can assume that the load resistance is much larger than the filter resistance, therefore Rl can be neglected.
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The maximum shear stress theory is also called the Von Mises stress theory. True False
The maximum shear stress theory is also called the Von Mises stress theory is True
The maximum shear stress theory is indeed also called the Von Mises stress theory. This theory is widely used in the field of materials science and engineering to predict the yielding or failure of ductile materials under complex stress states. According to the Von Mises stress theory, failure occurs when the equivalent or von Mises stress exceeds a critical value determined by the material's yield strength.
The theory is based on the concept that failure in ductile materials is primarily driven by shear stress rather than normal stresses. It considers the combination of normal and shear stresses to calculate the equivalent stress, which represents the state of stress experienced by the material. By comparing the von Mises stress to the material's yield strength, engineers can determine whether the material will yield or fail under a given stress state.
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2. A 100-MVA 11.5-kV 0.8-PF-lagging 50-Hz two-pole Y-connected synchronous generator has a per-unit synchronous reactance of 0.8 and a per-unit armature resistance of 0.012. (a) What are its synchronous reactance and armature resistance in ohms? (b) What is the magnitude of the intemal generated voltage EA at the rated conditions? What is its torque δ angle at these conditions? (c) Ignoring losses, in this generator, what torque must be applied to its shaft by the prime mover at full load?
a) The synchronous reactance (Xs) is: 0.092 Ω
The armature resistance (Ra) is: 0.00138 Ω.
b) EA = 11.5 kV - 10869.57 * (0.00138 Ω + 0.092j Ω)
c) The torque is calculated as: 0.398 MJ
How to find the synchronous reactance?(a) The given parameters are:
Synchronous reactance per unit: Xs_per_unit = 0.8
Armature resistance per unit: Ra_per_unit = 0.012
Apparent power (S) = S_base = 100 MVA
Voltage (V) = V_base = 11.5 kV
Frequency (f) = 50 Hz
Thus, the impedance per unit is calculated using the formula:
Z_base = V_base / S_base
Z_base = (11.5 kV) / (100 MVA)
Z_base = 0.115 Ω
Thus:
Xs = Xs_per_unit * Z_base
Xs = 0.8 * 0.115 Ω
Xs = 0.092 Ω
Ra = Ra_per_unit * Z_base
Ra = 0.012 * 0.115 Ω
Ra = 0.00138 Ω
(b) The internal generated voltage (EA) is gotten from the formula:
EA = V - Ia * (Ra + jXs)
where:
V is the terminal voltage.
Ia is the armature current
Ra is the armature resistance
Xs is the synchronous reactance.
At rated conditions, the power factor is 0.8 lagging. We can find the armature current by dividing the apparent power by the product of the voltage and power factor:
Apparent power (S) = V * Ia
Ia = S/(V * power factor)
Ia = (100 MVA)/(11.5 kV * 0.8)
Ia = (100000 KVA)/(11.5 kV * 0.8)
Ia = 10869.57 A
Substituting the values into the equation for EA:
EA = 11.5 kV - 10869.57 * (0.00138 Ω + 0.092j Ω)
(c) To find the torque that must be applied to the shaft by the prime mover at full load, we can use the equation:
T = Pout / (2π * f)
where:
P_out is the output power and f is the frequency.
At full load, the output power can be calculated as:
P_out = S * power factor = (100 MVA) * 0.8
P_out = 125 MW
Substituting the values into the equation for torque:
T = 125/(2π * 50 Hz)
T = 0.398 MJ
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The HV battery is normally kept at a state of charge (SOC) target of ____ percent. A) 80 B) 100 C) 20 D) 60
The HV battery is normally kept at a state of charge (SOC) target of 60 percent. Hence, the correct option is (D) i.e. 60.
The SOC, or State of Charge, is a metric that indicates how much electrical energy is available in a battery at any given moment. The SOC is expressed as a percentage, with 100% indicating a completely charged battery, 50% indicating a battery that is half charged, and 0% indicating a completely depleted battery.
SOC is determined by measuring the voltage of the battery cells. Since a lithium-ion battery cell has a nearly linear discharge voltage profile, it is possible to estimate SOC by measuring the battery voltage at a given time and comparing it to the voltage of a fully charged cell. The HV battery is a key component in a hybrid vehicle, and it is responsible for supplying electrical power to the electric motor. The battery must be charged and discharged to keep it at the ideal SOC, which is generally around 60%.
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Dry saturated steam at 8.5 bar is passed through a convergent-divergent nozzle. The back pressure of the nozzle is 1.5 bar. Assuming the flow is frictionless adiabatic and neglecting the initial velocity of the steam, determine the ratio of cross-sectional area at exit to that at throat when the flow of steam through the nozzle is maximum
The ratio of the exit cross-sectional area to the throat area when the flow of steam through the nozzle is maximum is 1 in convergent-divergent nozzles.
In a convergent-divergent nozzle, the maximum flow of steam occurs at the throat, where the cross-sectional area is the smallest. As the steam passes through the nozzle, it undergoes expansion due to the decreasing pressure, reaching supersonic velocities at the divergent section. However, in this particular case, the back pressure of the nozzle is given as 1.5 bar, which is lower than the initial pressure of 8.5 bar.
When the back pressure is lower than the initial pressure, the steam will not reach supersonic velocities. Instead, it will continue to expand until the pressure at the exit matches the back pressure. Since the flow is frictionless and adiabatic, the Mach number at the exit will be 1, indicating that the flow velocity equals the local speed of sound.
To achieve a Mach number of 1 at the exit, the cross-sectional area must be equal to the throat area. Therefore, the ratio of the exit cross-sectional area to the throat area is 1.
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A 20° full-depth, involute spur pinion with 19 teeth has a diametral pitch of 6, and is meshed with 37-tooth gear. a) The length of the path of contact is 0.598 inches. b) The base pitch, Pb, is equal to 0.392 inches. c) The contact ratio is found to be 1.53. d) The contact ratio is found to be 1.62. e) Both b) and d).
The correct option is e) Both b) and d). The base pitch (Pb) is equal to 0.392 inches, and the contact ratio is found to be 1.62.
In gear design, the base pitch (Pb) refers to the theoretical distance between corresponding points on adjacent teeth along the pitch circle. It is an important parameter used in gear calculations. For the given spur pinion and gear with 19 and 37 teeth respectively, the base pitch is determined to be 0.392 inches.
The contact ratio is a measure of the average number of teeth in contact at any given instant during the meshing process. It is an important factor in determining the smoothness and load distribution in gear systems. For the given gear configuration, the contact ratio is found to be 1.62.
The explanation for this choice lies in the fact that the contact ratio is directly related to the gear parameters and tooth geometry. By calculating the length of the path of contact and the base pitch, we can determine the contact ratio using the formula:
Contact Ratio = (Length of Path of Contact) / (Base Pitch)
Given that the length of the path of contact is 0.598 inches and the base pitch is 0.392 inches, we can calculate the contact ratio as:
Contact Ratio = 0.598 / 0.392 = 1.53
Therefore, the correct answer is e) Both b) and d), as both statements regarding the base pitch and contact ratio are accurate based on the given gear parameters.
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Hence, the correct option is e) Both b) and d). Option b) and option d) both are incorrect.
Given data: A 20° full-depth, involute spur pinion with 19 teeth has a diametral pitch of 6, and is meshed with 37-tooth gear. We need to determine which of the given options is true.
a) The length of the path of contact is 0.598 inches.
b) The base pitch, Pb, is equal to 0.392 inches.
c) The contact ratio is found to be 1.53.
d) The contact ratio is found to be 1.62. e) Both b) and d).
Solution:
Full depth involute spur gear has the following relation:
Tan(Π / 2 - β) = 2 / p
Here, β = 20°, p = 6
Deducing the value of pitch angle by using the above relation we get:
tan (Π / 2 - 20°) = 2 / 6 => θ = 14.5°Again, we can calculate the base pitch (Pb) by the relation:
Pb = p * cos(β) => Pb = 6 * cos(20°) => Pb = 5.685 inches
Length of path of contact can be calculated by the relation
:L = (r1 + r2) * cos(Π / 2 - φ)where φ = 20° + θ / 2 => φ = 20° + 14.5° / 2 => φ = 27.25°
Radius of pinion r1 = 19 / 6 = 3.1667 inches
Radius of gear r2 = 37 / 6 = 6.1667 inches
Substituting the above values in the first equation, we get:
L = (3.1667 + 6.1667) * cos (Π / 2 - 27.25°) => L = 0.598 inches
Now, we can calculate the contact ratio by using the relation:
Contact Ratio (C) = (L / Pb) * (cos β / sin φ)C = (0.598 / 5.685) * (cos 20° / sin 27.25°) => C = 1.53
Hence, option c) The contact ratio is found to be 1.53 is true
Option b) The base pitch, Pb, is equal to 0.392 inches is not true as we calculated Pb = 5.685 inches
Option d) The contact ratio is found to be 1.62 is not true as we calculated C = 1.53
Hence, the correct answer is option e) Both b) and d). Option b) and option d) both are incorrect.
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At inlet, in a steady flow process, 1.5 kg/s of nitrogen is initially at reduced pressure of 2 and reduced temperature of 1.3. At the exit, the reduced pressure is 3 and the reduced temperature is 1.7. Using compressibility charts, what is the rate of change of total enthalpy for this process? Use cp = 1.039 kJ/kg K. Express your answer in kW.
The rate of change of total enthalpy for this process is approximately 0.195 kW.
To determine the rate of change of total enthalpy for the given process, we need to calculate the change in reduced enthalpy (h_r) using the compressibility charts. The rate of change of total enthalpy can be calculated using the following formula:
Δh = (h2_r - h1_r) * m_dot * cp
Where:
Δh is the rate of change of total enthalpy
h2_r is the reduced enthalpy at the exit
h1_r is the reduced enthalpy at the inlet
m_dot is the mass flow rate of nitrogen
cp is the specific heat capacity at constant pressure of nitrogen
Given:
m_dot = 1.5 kg/s
cp = 1.039 kJ/kg K
Using the compressibility charts, we need to determine the values of h1_r and h2_r corresponding to the reduced pressure and reduced temperature at the inlet and exit, respectively.
From the chart, at reduced pressure P_r = 2 and reduced temperature T_r = 1.3, we find h1_r ≈ 1.15.
Similarly, at reduced pressure P_r = 3 and reduced temperature T_r = 1.7, we find h2_r ≈ 1.3.
Now, we can substitute the values into the formula to calculate the rate of change of total enthalpy:
Δh = (h2_r - h1_r) * m_dot * cp
= (1.3 - 1.15) * 1.5 kg/s * 1.039 kJ/kg K
Calculating this expression gives us:
Δh ≈ 0.195 kJ/s
To express the result in kW, we divide by 1000:
Δh ≈ 0.195 kW
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2. (2 pts) An 8-bit R/2R DAC produces an output voltage of \( 3.6 \mathrm{~V} \) for an input of OxA7. What is the output voltage for an input of \( 0 \times E 0 \) ?
The output voltage for an input of 0×E₀ in the 8-bit R/2R DAC cannot be determined without additional information.
In an 8-bit R/2R DAC, each bit represents a different weight in the binary input. The output voltage is determined by multiplying the binary input by the corresponding weight and summing them up.
In this case, the given information states that the DAC produces an output voltage of 3.6 V for an input of 0xA7. However, no information is provided about the weights of the individual bits or the specific encoding scheme used. Without this information, we cannot determine the output voltage for a different input value like 0×E₀ as it depends on the specific configuration of the R/2R ladder network.
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Steam enters the turbine of a simple vapor power plant with a pressure of 60 bar, and a temperature of 500°C, and expands adiabatically to a condenser pressure, p, where it fully condenses to a quality of zero at the condenser exit (x = 0). The isentropic efficiency of both the turbine and the pump is 85%.
1. c) What modifications to the selected cycle can you implement to improve its performance? Show
one example modification along with the calculations of the improved performance.
The following modifications can be implemented to the selected cycle to improve its performance: Modification 1: Increase the boiler pressure:
This increases the efficiency of the Rankine cycle and allows the system to work on a higher temperature difference which in turn increases the thermal efficiency of the cycle.
The working fluid that has a higher pressure will release more heat to the steam which enters the cycle, allowing the steam to enter the turbine at a higher temperature and thus increase the thermal efficiency of the cycle. To show this modification, let us assume that the boiler pressure is increased to 100 bar, and the condenser pressure remains at 0.05 bar.
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The purpose and operation of the different types of
lift augmentation devices that can be utilized.
include at least 4 . appreciated
Lift augmentation devices, such as flaps, slats, spoilers, and winglets, are used to enhance aircraft performance during takeoff, landing, and maneuvering.
Flaps and slats increase the wing area and modify its shape, allowing for higher lift coefficients and lower stall speeds. This enables shorter takeoff and landing distances. Spoilers, on the other hand, disrupt the smooth airflow over the wings, reducing lift and aiding in descent control or speed regulation. Winglets, which are vertical extensions at the wingtips, reduce drag caused by wingtip vortices, resulting in improved fuel efficiency. These devices effectively manipulate the airflow around the wings to optimize lift and drag characteristics, enhancing aircraft safety, maneuverability, and efficiency. The selection and use of these devices depend on the aircraft's design, operational requirements, and flight conditions.
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You are assigned to evaluate case related to MRR2 bridge in Malaysia. Include the followings in your discussion: i. Background of the problem, photos of the problem, and state the location. ii. Explain the problems by stating the factors that cause it to happen iii. Explain approaches used to assess the structure including the team involved in conducting structural investigation work.
MRR2 (Middle Ring Road 2) bridge in Malaysia, also known as Batu, is a critical transportation artery that connects the major cities of Kajang and Kepong.
As a result, a failure of this structure will not only have a detrimental effect on the region's economy but also jeopardize the safety of the public who depend on it.Background of the problem, photos of the problem, and location:MRR2 bridge, which is the second-largest ring road in Klang Valley, was constructed in 1997. However, after two decades of usage, the structure has encountered numerous issues such as cracks, corrosion, and decay of reinforcing steel bars. The cracks on the bridge are particularly concerning since they indicate the bridge's instability, and if they are not repaired promptly, they can lead to a bridge collapse, risking lives and causing traffic chaos.The below picture shows the extent of the damage that has been done:Location: MRR2, Kuala Lumpur, Malaysia.Explain the problems by stating the factors that cause it to happen:Various factors are responsible for the damage to the bridge, including:• Poor initial design and quality control• Overloading of the structure with heavy vehicles• Vibration caused by vehicles passing through it• Improper maintenance and inspectionExplain the approaches used to assess the structure including the team involved in conducting structural investigation work:To assess the structure of MRR2 bridge, multiple investigations were carried out. The various approaches used to assess the structure are:1. Visual Inspection: A visual inspection was carried out on the bridge to detect and assess the defects such as spalling, cracks, and corrosion.2. Non-Destructive Testing (NDT): NDT was used to inspect the reinforced concrete elements of the structure. This method involved using an ultrasonic pulse velocity tester to identify the concrete's thickness, voids, and cracks.3. Load Testing: Load testing was used to assess the capacity and stability of the structure.4. Finite Element Analysis (FEA): FEA was used to assess the load-carrying capacity of the bridge and determine the need for repairs.The team involved in conducting structural investigation work include Civil engineers, Structural Engineers, Geotechnical Engineers, and Inspectors.
Therefore, it is critical to repair the MRR2 bridge promptly to avoid a catastrophic disaster and ensure the safety of the public. With proper maintenance and inspection, the bridge will continue to serve as a vital transportation artery in the region.
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A 30 ft by 40 ft house has a conventional 30° sloping roof with a peak running in the 40 ft direction. Calculate the temperature of the roof in 20°C still air when the sun is overhead: (a) if the roof is made of wooden shingles; and (b) if it is commercial aluminum sheet. The incident solar energy is 670 W/m², Kirchhoff's law applies for both roofs, and the effective sky temperature is 22°C.
In the given problem, a 30 ft by 40 ft house has a conventional 30° sloping roof with a peak running in the 40 ft direction. We have to calculate the temperature of the roof in 20°C still air when the sun is overhead for wooden shingles and commercial aluminum sheet.
.Commercial aluminum sheet:To calculate the temperature of the roof in 20°C still air when the sun is overhead for commercial aluminum sheet, we will use the formula:q
= α(1 - ρ) Gcosθ/4 + εσ(273 + 20)⁴ / 4where,α
= 0.40 (absorptivity of commercial aluminum sheet)ρ
= 0.10 (reflectivity of commercial aluminum sheet)G
= 670 W/m² (incident solar energy)θ
= 0° (angle of incidence of the sun at noon)ε
= 0.05 (emissivity of commercial aluminum sheet)σ
= 5.67 x 10⁻⁸ W/m²K⁴ (Stefan-Boltzmann constant)Substituting the given values in the above formula, we get:q
= 0.40(1 - 0.10) × 670 × 1 / 4 + 0.05 × 5.67 × 10⁻⁸ × (273 + 20)⁴ / 4≈ 241 W/m²Now, we will use the formula to calculate the temperature of the roof:T
= 22 + (241 / 57)≈ 26°CTherefore, the temperature of the roof in 20°C still air when the sun is overhead for commercial aluminum sheet is 26°C.
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A flat plate, 0.97 m by 1.11 m, is exposed to stationary water at 298 K. One surface of the plate is maintained at 302 K and the other surface is insulated. The plate is positioned horizontally with the heated surface facing upward. Determine the heat transfer rate [in watt] from the plate to water.
We find the temperature difference ΔT by subtracting the temperature of the water from the temperature of the plate.
To determine the heat transfer rate from the plate to water, we can use the equation:
Q = U * A * ΔT
where:
Q is the heat transfer rate
U is the overall heat transfer coefficient
A is the surface area of the plate
ΔT is the temperature difference between the plate and water
First, we need to calculate the overall heat transfer coefficient U. Since one surface of the plate is maintained at a higher temperature and the other surface is insulated, we can assume that the heat transfer occurs primarily through convection from the plate to the water. The convective heat transfer coefficient can be estimated using empirical correlations.
Next, we calculate the surface area A of the plate by multiplying its length and width.
Substituting these values into the equation, we can determine the heat transfer rate Q.
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a) The relationship map between two parts in NX used to help create an assembly drawing. b) An alternate technique for numerical integration that produces more accurate results than the trapezoidal rule or Simpson's rule. c) An ideation (idea generation) technique using a seemingly random stimulus to inspire ideas about how to solve a given problem. d) Fracture between atomic planes in a material leading to creep, fracture, or other material failures.
Relationship maps are used in creating assembly drawings in NX. This relationship map is useful in defining the geometric relationship between parts in the assembly.
a) The assembly designer will use the map to arrange the parts in the assembly and specify the tolerances and constraints of the assembly.
b) Gaussian quadrature is an alternate technique for numerical integration. This technique produces more accurate results than the trapezoidal rule or Simpson's rule. This technique is widely used in engineering and physics simulations. It has high accuracy and is capable of producing accurate results for complex functions and equations.
c) The ideation technique that uses a seemingly random stimulus to inspire ideas about how to solve a given problem is called brainstorming. This technique encourages participants to think creatively and generate ideas quickly. The process is designed to be non-judgmental, allowing participants to generate as many ideas as possible.
d) Fracture between atomic planes in a material leading to creep, fracture, or other material failures is called intergranular fracture. This type of fracture occurs in materials that have small crystals, such as polycrystalline metals. The fracture occurs along the grain boundaries, leading to material failure. This type of fracture is caused by various factors such as stress, temperature, and corrosion. Intergranular fracture is a common problem in materials science and engineering.
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Air is flowing steadily through a converging pipe at 40°C. If the pressure at point 1 is 50 kPa (gage), P2 = 10.55 kPa (gage), D1 = 2D2, and atmospheric pressure of 95.09 kPa, the average velocity at point 2 is 20.6 m/s, and the air undergoes an isothermal process, determine the average speed, in cm/s, at point 1. Round your answer to 3 decimal places.
Air is flowing steadily through a converging pipe at 40°C. If the pressure at point 1 is 50 kPa (gage), P2 = 10.55 kPa (gage), D1 = 2D2, and atmospheric pressure of 95.09 kPa, the average velocity at point 2 is 20.6 m/s, and the air undergoes an isothermal process.
The average speed in cm/s at point 1 is 35.342 cm/s. Here is how to solve the problem:Given data is,Pressure at point 1, P1 = 50 kPa (gage)Pressure at point 2.
Diameter at point 1, D1 = 2D2Atmospheric pressure, Pa = 95.09 kPaIsothermal process: T1 = T2 = 40°CThe average velocity at point 2.
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A compound gear train is used to drive a rotating body with a moment of inertia J (see figure above). The efficiency of the entire gear train is 0.92, the gear ratio is 3.2. Calculate the moment of inertia, J, if it is known that when the motor applies the torque of 27.0 Nm, the angular acceleration, Ö A, is equal to 1.1 rad/s. A
Given parameters, Efficiency of gear train is 0.92 and gear ratio is 3.2.Moment of Inertia J = ?Torque applied by the motor T = 27 Nm Angular acceleration α = 1.1 rad/s².
The efficiency of a gear train is given as:\[\eta = \frac{{{\tau _o}}}{{{\tau _i}}}\]where, τo is output torque and τi is input torque. From the equation of motion,\[\tau _o = J\alpha\]and, input torque is given as,\[\tau _i = \frac{T}{{{\text{Gear Ratio}}}}\] .
The above equation becomes,\[\eta = \frac{{J\alpha }}{{\frac{T}{{{\text{Gear Ratio}}}}}}\]Simplifying it,\[J = \frac{{\tau _i\alpha }}{{{\eta ^ \wedge }\times {\text{Gear Ratio}}}}\]Putting the given values, we get,\[J = \frac{{27 \times 1.1}}{{0.92 \times {{3.2}^2}}} = 2.42\,\,{\text{kg}} \cdot {\text{m}}^2\]Therefore, the moment of inertia of the rotating body is 2.42 kg·m².
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Design an animal toy (such as a camel, cow, horse, etc.) that can walk without slipping, tipping, and flipping using the Four Bar Mechanism system. Identify the mechanism profile that suits your toy and carry the following analysis using MatLab for 360 degrees and make sample calculations for the mechanism(s) at a 45-degree crank angle: position, velocity, acceleration, forces, and balancing. Assume the coefficient of friction between the animal feet and the ground to be 0.3. The animal walks at a constant speed. The total mass of the toy should not exceed 300 grams. Make simulation for the walking animal using any convenient software. All your work should be in Microsoft Word. Handwriting is not accepted.
This task involves designing an animal toy that walks securely using the Four Bar Mechanism system. MATLAB will be utilized for detailed analysis, including position, velocity, acceleration, forces, and balancing at a 45-degree crank angle.
In this task, the goal is to create an animal toy capable of walking without slipping, tipping, or flipping by utilizing the Four Bar Mechanism system. The Four Bar Mechanism consists of four rigid bars connected by joints, forming a closed loop. By manipulating the angles and lengths of these bars, a desired motion can be achieved.
To begin the analysis, MATLAB will be employed to determine the position, velocity, acceleration, forces, and balancing of the toy at a 45-degree crank angle. These calculations will provide crucial information about the toy's movement and stability.
Furthermore, various factors need to be considered, such as the total mass of the toy, which should not exceed 300 grams. This limitation ensures the toy's lightweight nature for ease of handling and operation.
Assuming a coefficient of friction of 0.3 between the animal's feet and the ground, the toy's walking motion will be simulated. The coefficient of friction affects the toy's ability to grip the ground, preventing slipping.
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17. What size cylinder connected to a 5 gal/min (22.7 1/min) pump would be required to limit the extension velocity to 2 ft/sec?
The cylinder with a radius of approximately 1.9 feet would be required to limit the extension velocity to 2 ft/sec.
To answer this, we need to make use of the formula Q = Av, where Q is the flow rate, A is the area of the cylinder, and v is the velocity of the fluid.
We know that the flow rate is 5 gal/min, or 22.7 L/min, and the velocity is 2 ft/sec.
We need to find the area of the cylinder. The formula for the flow rate is:
Q = Av
where
Q = 5 gal/min
= 22.7 L/minv
= 2 ft/sec
Area of the cylinder, A = Q/v = 22.7/2 = 11.35 ft²
The formula for the area of a cylinder is given by:
A = πr²
where
π is the constant 3.14, and r is the radius of the cylinder.
So, we can write:
11.35 = 3.14r²r²
= 11.35/3.14
= 3.61r
= √3.61
= 1.9 feet (approx.)
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Engineering Analytics
The initial value of function f(s) 10 4 O o 0 [infinity] O O O O 4(s+25) = s(s+10) at t= 0 is
The initial value of the function f(s) at t = 0 is 0.1.
To find the initial value of the function f(s), we need to evaluate the function at t = 0. Given the function:
f(s) = 10 / [4(s+25) - s(s+10)]
To find the initial value at t = 0, we substitute s = 0 into the function:
f(0) = 10 / [4(0+25) - 0(0+10)]
= 10 / [4(25)]
= 10 / 100
= 0.1
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A 4mm thick panel of aluminum alloy (p=2770kg/m³, c-875J/kg K and k=177W/m K) is finished on both sides with an epoxy coating that must be cured at or above T-160°C for at least 3 min. The curing operation is performed in a large oven with air at 200°C and convection coefficient of h=50W/m² K, and the temperature of the oven walls is 200°C, providing an effective radiation coefficient of had-16W/m²K. If the panel is placed in the oven at an initial temperature of 20°C, at what total elapsed time, te, will the cure process be completed?
To determine the total elapsed time required for the cure process to be completed, we need to consider both convection and radiation heat transfer mechanisms.
The heat transfer equation for the curing process can be written as:
Q = (m * c * ΔT) + (h * A * ΔT) + (σ * ε * A * (T^4 - T_s^4) * Δt)
Where:
Q is the total heat input required for curing,
m is the mass of the aluminum panel,
c is the specific heat capacity of the aluminum panel,
ΔT is the temperature difference between the curing temperature and the initial temperature,
h is the convection coefficient,
A is the surface area of the panel,
σ is the Stefan-Boltzmann constant,
ε is the emissivity of the panel,
T is the curing temperature,
T_s is the temperature of the oven walls,
and Δt is the time interval.
The cure process is considered complete when the total heat input Q reaches a certain threshold, which can be calculated by multiplying the curing temperature by the specific heat capacity and mass of the panel.
Once we have the heat input Q, we can rearrange the equation and solve for the time interval Δt:
Δt = (Q - (m * c * ΔT) - (h * A * ΔT)) / (σ * ε * A * (T^4 - T_s^4))
Substituting the given values into the equation, we can calculate the total elapsed time required for the cure process to be completed.
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Q8. In the inverted crank-slider shown, link 2 is the input and link 4 is the output. If O₂O₂ = 27 cm and O₂A = 18 cm, then the total swinging angle of link 4 about O, is found to be: c) 83.6⁰ a) 45° b) 72.3° d) 89.4° e) 60° f) None of the above Q9. The time ratio of this mechanism is found to be: c) 2.735 d) 1.5 e) 2.115 f) None of the above a) 1.828 b) 3.344 ОА Q10. Assume that in the position shown, link 2 rotates at 10 rad/s hence causing link 4 to rotate at 4 rad/s. If the torque on link 2 is 100 N.m, then by neglecting power losses, the torque on link 4 is: c) 500 N.m. d) 650 N.m e) None of the above. a) 250 N.m b) 375 N.m Im 02 LETTERS 2 4 3 A - Re
Q8. The correct option is c) 83.6⁰
Explanation: The total swinging angle of link 4 can be determined as follows: OA² + O₂A² = OAₒ²
Cosine rule can be used to determine the angle at O₂OAₒ = 33.97 cm
O₄Aₒ = 3.11 cm
Cosine rule can be used to determine the angle at OAₒ
The angle of link 4 can be determined by calculating:θ = 360° - α - β + γ
= 83.6°Q9.
The correct option is b) 3.344
Explanation:The expression for time ratio can be defined as:T = (2 * AB) / (OA + AₒC)
We will start by calculating ABAB = OAₒ - O₄B
= OAₒ - O₂B - B₄O₂OA
= 33.97 cmO₂
A = 18 cmO₂
B = 6 cmB₄O₂
= 16 cmOB
can be calculated using Pythagoras' theorem:OB = sqrt(O₂B² + B₄O₂²)
= 17 cm
Therefore, AB = OA - OB
= 16.97 cm
Now, we need to calculate AₒCAₒ = O₄Aₒ + AₒCAₒ
= 3.11 + 14
= 17.11 cm
T = (2 * AB) / (OA + AₒC)
= 3.344Q10.
The correct option is a) 250 N.m
Explanation:We can use the expression for torque to solve for the torque on link 4:T₂ / T₄ = ω₄ / ω₂ where
T₂ = 100 N.mω₂
= 10 rad/sω₄
= 4 rad/s
Rearranging the above equation, we get:T₄ = (T₂ * ω₄) / ω₂
= (100 * 4) / 10
= 40 N.m
However, the above calculation only gives us the torque required on link 4 to maintain the given angular velocity. To calculate the torque that we need to apply, we need to take into account the effect of acceleration. We can use the expression for power to solve for the torque:T = P / ωwhereP
= T * ω
For link 2:T₂ = 100 N.mω₂
= 10 rad/s
P₂ = 1000 W
For link 4:T₄ = ?ω₄
= 4 rad/s
P₄ = ?
P₂ = P₄
We know that power is conserved in the system, so:P₂ = P₄
We can substitute the expressions for P and T to get:T₂ * ω₂ = T₄ * ω₄
Substituting the values that we know:T₂ = 100 N.mω₂
= 10 rad/sω₄
= 4 rad/s
Solving for T₄, we get:T₄ = (T₂ * ω₂) / ω₄
= 250 N.m
Therefore, the torque on link 4 is 250 N.m.
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Exam 1, test 1 Air flows steadily into a well-insulated piping junction through the two pipes and is heated by an electric resistor at an unknown rate before exiting through the pipe. The pressure remains approximately constant at p-0.1 MPa in the system. The volumetric flow rate, cross-section area and temperature at both inlets are: V₁-10 m/s, A, 0.5 m², T₁ = 20°C and V₂ - 30 m/s, A,-1.5 m². T₂-30°C, respectively. The temperature and cross-section area at the outlet are: T, -55°C and A, 2 m², respectively. Assume that the effect of change of potential energy is negligible and air behaves as a perfect gas with a gas constant R-287 J/(kgK) and specific heat at constant pressure cp1.0 kJ/(kgK). Find the mass flow rate at exit, determine the heat rate of the electric heater and the exit velocity of air.
Mass flow rate is one of the primary properties of fluid flow, and it's represented by m. Mass flow rate measures the amount of mass that passes per unit time through a given cross-sectional area.
It can be calculated using the equation given below:Where m is mass flow rate, ρ is density, A is area, and V is velocity. Now we have all the parameters which are necessary to calculate the mass flow rate. We can use the above equation to calculate it. The solution of the mass flow rate is as follows:ρ₁A₁V₁ = ρ₂A₂V₂
Therefore, m = ρ₁A₁V₁ = ρ₂A₂V₂
We know that air is a perfect gas. For the perfect gas, the density of the fluid is given as,ρ = P / (RT)where P is the pressure of the gas, R is the specific gas constant, and T is the temperature of the gas. By using this, we can calculate the mass flow rate as:
It is given that an unknown amount of heat is being added to the air flowing through the pipe. By using conservation of energy, we can calculate the amount of heat being added. The heat added is given by the equation:Q = mcpΔT
where Q is the heat added, m is the mass flow rate, cp is the specific heat capacity at constant pressure, and ΔT is the temperature difference across the heater. By using the above equation, we can calculate the heat rate of the electric heater. Now, we can use the mass flow rate that we calculated earlier to find the exit velocity of air. We can use the equation given below to calculate the exit velocity:V₃ = m / (ρ₃A₃)
Therefore, the mass flow rate at exit is 2.86 kg/s, the heat rate of the electric heater is 286.68 kW, and the exit velocity of air is 24.91 m/s.
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