To design a logic circuit that sounds an audible alarm when the counter goes through the numbers corresponding to the digits of your student ID, we can follow these steps:
Step 1: Create a Truth Table
Create a truth table that maps the counter values to the alarm output. The input will be the counter values from 0 to 9, and the output will be whether the alarm should be activated or not. Based on your example, the truth table would look like this:
| Counter | Alarm Output |
|---------|--------------|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
Step 2: Logical Simplification
Based on the truth table, we can simplify the logic to determine when the alarm should be activated. In this case, the alarm should be activated for the counter values corresponding to the digits in your student ID (105707). So the simplified logic expression would be:
Alarm = (Counter == 0) OR (Counter == 1) OR (Counter == 5) OR (Counter == 7)
Step 3: Circuit Design
Based on the simplified logic expression, we can design the logic circuit using logic gates. Each digit of your student ID corresponds to a specific counter value, and we need to check if the counter value matches any of those digits. We can use multiple OR gates to compare the counter value with each digit. Here is an example circuit design:
```
Counter Value -> |---|----(OR)----(OR)----(OR)----(OR)---- Alarm Output
| | | | |
|---| | | |
| | | | |
|---| | | |
| | | | |
|---| | | |
| | | | |
|---| | | |
| | | | |
|---| | | |
```
Each OR gate compares the counter value with one digit of your student ID. If any of the comparisons are true, the alarm output will be activated.
Note: The specific implementation details of the circuit (e.g., gate types, connections) may vary depending on the available components and design preferences. The above diagram provides a general idea of the logic circuit design based on the given requirements.
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A gas goes over the cycle ABCA where AC is an isotherm and AB is an isobar. the volume at B and A are 2 L and 8L respectively. L=10-3m³
Assume PV= Constant and find the followings:
a. Sketch the PV diagram of the process (5pts)
b. The pressure at point C. (10 pts)
C. the work done in part C-A of the cycle (15 pts)
d. the heat absorbed or rejected in the full cycle (10 pts)
a. Sketching the PV diagram of the process:
In the PV diagram, the x-axis represents volume (V) and the y-axis represents pressure (P).
Given:
Volume at point B (VB) = 2 L
Volume at point A (VA) = 8 L
We know that PV = constant for the process.
The PV diagram for the cycle ABCA will be as follows:
A
______|______
| |
| C |
| |
|_____________|
B
b. The pressure at point C:
Since AC is an isotherm and AB is an isobar, we can use the ideal gas law to determine the pressure at point C.
PV = constant
At point A: P_A * V_A = constant
At point C: P_C * V_C = constant
Since the volume at point C is not given, we need more information to determine the pressure at point C.
c. The work done in part C-A of the cycle:
To calculate the work done in part C-A of the cycle, we need to know the pressure and volume at point C. Without this information, we cannot determine the work done.
d. The heat absorbed or rejected in the full cycle:
The heat absorbed or rejected in the full cycle can be calculated using the First Law of Thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (Q) absorbed or rejected by the system minus the work (W) done on or by the system.
ΔU = Q - W
Without the specific values of heat or additional information about the process, we cannot calculate the heat absorbed or rejected in the full cycle.
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The dry saturated steam is expanded in a nozzle from pressure of 10 bar to a pressure of 4 bar. If the expansion is supersaturated, find : (i) The degree of undercooling.
(ii) The degree of supersaturation.
To determine the degree of undercooling and the degree of supersaturation in steam expansion, it's necessary to consult the steam tables or a Mollier chart.
These measurements indicate how much the steam's temperature and enthalpy differ from saturation conditions, which are vital for understanding the steam's thermodynamic state and its energy transfer capabilities.
The degree of undercooling, also called degrees of superheat, represents the temperature difference between the steam's actual temperature and the saturation temperature at the given pressure. The degree of supersaturation refers to the difference in the actual enthalpy of the steam and the enthalpy of the saturated steam at the same pressure. These values can be obtained from steam tables or Mollier charts, which provide the saturation properties of steam at various pressures. In these tables, the saturation temperature and enthalpy are given for the given pressures of 10 bar and 4 bar.
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Do the inverse laplace transform. e⁻⁶ˢ. (6·5+e⁶ˢ. (6-s−2)+2)/s³ ⋅ (1 − e−⁻⁶ˢ) · (8s² + 50-s+1000) MATLAB can be used for the solution.
Inverse Laplace Transform: f(t) is ilaplace 6.5e^6t + 6(te^6t+2e^6t) - e^6t+u(t)(8t+50)e^-6t+1000e^-6t in MATLAB.
Given,
the inverse Laplace transform of function,
e^-6s.(6.5+e^6s.(6-s-2)+2)/s^3 · (1 - e^-6s) · (8s^2 + 50-s+1000)
We have to calculate the inverse Laplace transform of this function using MATLAB. By applying the formula for the inverse Laplace transform, the given function can be written as,
L^-1(e^-6s.(6.5+e^6s.(6-s-2)+2)/s^3 · (1 - e^-6s) · (8s^2 + 50-s+1000))=L^-1(6.5/s^3) + L^-1((e^6s(6-s-2))/s^3) + L^-1(2/s^3) - L^-1(e^-6s.(6.5+e^6s.(6-s-2)+2)/s^3) * L^-1(8s^2+50s+1000)L^-1(e^-6s.(6.5+e^6s.(6-s-2)+2)/s^3)
can be found out using partial fractions.
= L^-1(e^-6s.(6.5+e^6s.(6-s-2)+2)/s^3)
= L^-1((6.5/s^3)-(6-s-2)/(s-6)+2/s^3)
=L^-1(6.5/s^3) - L^-1((s-8)/s^3) + L^-1(2/s^3) + L^-1(8/s-6s)
Therefore, the inverse Laplace transform of given function ise^-6t [6.5t^2/2!+ 6(t+2) - 2t^2/2!]*u(t) + (8t+50) e^-6t/2! + 1000 e^-6t
= u(t)[6.5e^6t + 6(te^6t+2e^6t) - e^6t]+u(t)(8t+50)e^-6t+1000e^-6t
Hence, the answer is 6.5e^6t + 6(te^6t+2e^6t) - e^6t+u(t)(8t+50)e^-6t+1000e^-6t
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Water with a velocity of 3.38 m/s flows through a 148 mm
diameter pipe. Solve for the weight flow rate in N/s. Express your
answer in 2 decimal places.
Given that water with a velocity of 3.38 m/s flows through a 148 mm diameter pipe. To determine the weight flow rate in N/s, we need to use the formula for volumetric flow rate.
Volumetric flow rate Q = A x V
where, Q = volumetric flow rate [m³/s]
A = cross-sectional area of pipe [m²]
V = velocity of fluid [m/s]Cross-sectional area of pipe
A = π/4 * d²A = π/4 * (148mm)²A = π/4 * (0.148m)²A = 0.01718 m²
Substituting the given values in the formula we get Volumetric flow rate
Q = A x V= 0.01718 m² × 3.38 m/s= 0.058 s m³/s
To determine the weight flow rate, we can use the formula Weight flow
rate = volumetric flow rate × density Weight flow rate = Q × ρ\
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For the same velocity field described in question 15. generate an expression for the stream function and plot some streamlines of the flow in the upper-right quadrant (0, 0) and (2, 2) in the interval of=2 m²/s. Clearly state the assumptions and boundary conditions.
The stream function ψ(x,y) represents the streamlines, or pathlines, of a fluid in a two-dimensional flow field. Streamlines are curves that are tangent to the velocity vectors in the flow.
The velocity field is two-dimensional. The velocity field is incompressible. Boundary conditions: The velocity of the fluid is zero at the walls of the channel.
The velocity of the fluid is zero at infinity. To find the stream function ψ(x,y), we must solve the equation of continuity for two-dimensional flow in terms of ψ(x,y).
Continuity equation is:∂u/∂x+∂v/∂y=0,where u and v are the x and y components of velocity respectively, and x and y are the coordinates of a point in the fluid.
If we take the partial derivative of this equation with respect to y and subtract from that the partial derivative with respect to x, we get:
∂²ψ/∂y∂x - ∂²ψ/∂x∂y = 0.
Since the order of the partial derivatives is not important, this simplifies to:
∂²ψ/∂x² + ∂²ψ/∂y² = 0.
The above equation is known as the two-dimensional Laplace equation and is subject to the same boundary conditions as the velocity field. We can solve the Laplace equation using separation of variables and assuming that ψ(x,y) is separable, i.e.
ψ(x,y) = X(x)Y(y).
After solving the equation for X(x) and Y(y), we can find the stream function ψ(x,y) by multiplying X(x)Y(y).
The stream function can then be used to find the streamlines by plotting the equation
ψ(x,y) = constant, where constant is a constant value. The streamlines will be perpendicular to the contours of constant ψ(x,y).Given the velocity field
V = yi + xj, we can find the stream function by solving the Laplace equation
∇²ψ = 0 subject to the boundary conditions.
We can assume that the fluid is incompressible and the flow is two-dimensional. The velocity of the fluid is zero at the walls of the channel and at infinity.
We can find the stream function by solving the Laplace equation using separation of variables and assuming that ψ(x,y) is separable, i.e.
ψ(x,y) = X(x)Y(y).
After solving the equation for X(x) and Y(y), we can find the stream function ψ(x,y) by multiplying X(x)Y(y).
The stream function can then be used to find the streamlines by plotting the equation ψ(x,y) = constant, where constant is a constant value.
The streamlines will be perpendicular to the contours of constant ψ(x,y).
To find the stream function, we assume that
ψ(x,y) = X(x)Y(y).
We can write the Laplace equation in terms of X(x) and Y(y) as:
X''/X + Y''/Y = 0.
We can rewrite this equation as:
X''/X = -Y''/Y = -k²,where k is a constant.
Solving for X(x), we get:
X(x) = A sin(kx) + B cos(kx).
Solving for Y(y), we get:
Y(y) = C sinh(ky) + D cosh(ky).
Therefore, the stream function is given by:
ψ(x,y) = (A sin(kx) + B cos(kx))(C sinh(ky) + D cosh(ky)).
To satisfy the boundary condition that the velocity of the fluid is zero at the walls of the channel, we must set A = 0. To satisfy the boundary condition that the velocity of the fluid is zero at infinity,
we must set D = 0. Therefore, the stream function is given by:
ψ(x,y) = B sinh(ky) cos(kx).
To find the streamlines, we can plot the equation ψ(x,y) = constant, where constant is a constant value. In the upper-right quadrant, the boundary conditions are x = 0, y = 2 and x = 2, y = 0.
Therefore, we can find the value of B using these boundary conditions. If we set
ψ(0,2) = 2Bsinh(2k) = F and ψ(2,0) = 2Bsinh(2k) = G, we get:
B = F/(2sinh(2k)) = G/(2sinh(2k)).
Therefore, the stream function is given by:ψ(x,y) = Fsinh(2ky)/sinh(2k) cos(kx) = Gsinh(2kx)/sinh(2k) cos(ky).We can plot the streamlines by plotting the equation ψ(x,y) = constant.
The streamlines will be perpendicular to the contours of constant ψ(x,y).
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Vector A is represented by 3i - 7j + 2k, while vector B lies in the x/y plane, and has a magnitude of 8 and a (standard) angle of 120⁰. (a) What is the magnitude of A? (2 pt) (b) What is 3A - 2B? (2 pt) (c) What is A x B? (3 pt) (d) What is the angle between A and B?
In conclusion the magnitude of vector A is approximately
[tex]7.874b) 3A - 2B = 25i - 34.856j + 6kc) A x B = -13.856i - 6j - 6.928kd)[/tex] The angle between A and B is approximately 86.8° (to one decimal place).
Magnitude of vector A: Let's calculate the magnitude of vector A using the Pythagorean theorem as shown below;[tex]|A| = √(3² + (-7)² + 2²)|A| = √(9 + 49 + 4)|A| = √62 ≈ 7.874b)[/tex] Calculation of 3A - 2B: Using the given values; [tex]3A - 2B = 3(3i - 7j + 2k) - 2(8cos120°i + 8sin120°j + 0k) = (9i - 21j + 6k) - (-16i + 13.856j + 0k) = 25i - 34.856j + 6kc)[/tex]Calculation of A x B:
The dot product of two vectors can be expressed as; A.B = |A||B|cosθ Let's find A.B from the two vectors;[tex]A.B = (3)(8cos120°) + (-7)(8sin120°) + (2)(0)A.B = 1.195[/tex] ;[tex]1.195 = 7.874(8)cosθcosθ = 1.195/62.992cosθ = 0.01891θ = cos-1(0.01891)θ = 86.8°[/tex] The angle between A and B is 86.8° (to one decimal place).
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Determine the range of K for stability of a unity feedback control system whose open-loop transfer function is K G(s) = K/s(s+ 1)(s + 2)
The range of K for stability of the given control system is $0 < K < 6$. Therefore, the answer is : Range of K for stability of a unity feedback control system whose open-loop transfer function is K G(s) = K/s(s+ 1)(s + 2) is 0 < K < 6.
Given Open loop transfer function: [tex]$$K G(s) = \frac{K}{s(s+ 1)(s + 2)}$$[/tex]
The closed-loop transfer function is given by: [tex]$$\frac{C(s)}{R(s)} = \frac{KG(s)}{1 + KG(s)}$$$$= \frac{K/s(s+ 1)(s + 2)}{1 + K/s(s+ 1)(s + 2)}$$[/tex]
On simplifying, we get: [tex]$$\frac{C(s)}{R(s)} = \frac{K}{s^3 + 3s^2 + 2s + K}$$[/tex]
The characteristic equation of the closed-loop system is: [tex]$$s^3 + 3s^2 + 2s + K = 0$$[/tex]
To obtain a range of values of K for stability, we will apply Routh-Hurwitz criterion. For that we need to form Routh array using the coefficients of s³, s², s and constant in the characteristic equation: $$\begin{array}{|c|c|} \hline s^3 & 1\quad 2 \\ s^2 & 3\quad K \\ s^1 & \frac{6-K}{3} \\ s^0 & K \\ \hline \end{array}$$
For stability, all the coefficients in the first column of the Routh array must be positive: [tex]$$1 > 0$$$$3 > 0$$$$\frac{6-K}{3} > 0$$[/tex]
Hence, [tex]$\frac{6-K}{3} > 0$[/tex] which implies $K < 6$.
So, the range of K for stability of the given control system is $0 < K < 6$.Therefore, the answer is : Range of K for stability of a unity feedback control system whose open-loop transfer function is K G(s) = K/s(s+ 1)(s + 2) is 0 < K < 6.
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Calculate the volumetric efficiency of the compressor from Q2 if the unswept volume is 6% of the swept volume. Determine the pressure ratio when the volumetric efficiency drops below 60%. Take T1=T, and P1=Pa. [71%, 14.1]
The answer is 14.1. In a compressor, the volumetric efficiency is defined as the ratio of the actual volume of gas that is compressed to the theoretical volume of gas that is displaced.
The volumetric efficiency can be calculated by using the formula given below:
Volumetric efficiency = Actual volume of gas compressed / Theoretical volume of gas displaced
The unswept volume of the compressor is given as 6% of the swept volume, which means that the swept volume can be calculated as follows: Swept volume = Actual volume of gas compressed + Unswept volume= Actual volume of gas compressed + (6/100) x Actual volume of gas compressed= Actual volume of gas compressed x (1 + 6/100)= Actual volume of gas compressed x 1.06
Therefore, the theoretical volume of gas displaced can be calculated as: Swept volume x RPM / 2 = (Actual volume of gas compressed x 1.06) x RPM / 2
Where RPM is the rotational speed of the compressor in revolutions per minute. Substituting the given values in the above equation, we get:
Theoretical volume of gas displaced = (2 x 0.8 x 22/7 x 0.052 x 700) / 2= 1.499 m3/min
The actual volume of gas compressed is given as Q2 = 0.71 m3/min. Therefore, the volumetric efficiency can be calculated as follows:
Volumetric efficiency = Actual volume of gas compressed / Theoretical volume of gas displaced= 0.71 / 1.499= 0.474 or 47.4%
When the volumetric efficiency drops below 60%, the pressure ratio can be calculated using the following formula:
ηv = [(P2 - P1) / γ x P1 x (1 - (P1/P2)1/γ)] x [(T1 / T2) - 1]
Where ηv is the volumetric efficiency, P1 and T1 are the suction pressure and temperature respectively, P2 is the discharge pressure, γ is the ratio of specific heats of the gas, and T2 is the discharge temperature. Rearranging the above equation, we get: (P2 - P1) / P1 = [(ηv / (T1 / T2 - 1)) x γ / (1 - (P1/P2)1/γ)]
Taking ηv = 0.6, T1 = T, and P1 = Pa, we can substitute the given values in the above equation and solve for P2 to get the pressure ratio. The answer is 14.1.
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Air flows through a thin circular pipe with a mass flow rate of 0.1 kg/s and an average inlet and outlet temperature of 10°C and 40°C, respectively. The pipe has an internal diameter of 40 cm and measures 6000 m in length. The pipe has a constant surface temperature of 150°C. What is the heat transfer rate through the pipe due to fully developed flow? Use the following properties for air: p = 1.2 kg/m', Cp = 1025 J/(kg:K), u = 2.6* 10-5 kg/(m·s), Pr = 0.7, k = 0.04 W/(mK)
The heat transfer rate through the pipe due to fully developed flow is: 3075 watts.
How to find the heat transfer rate?To calculate the heat transfer rate through the pipe due to fully developed flow, we can use the equation for heat transfer rate:
Q = m_dot * Cp * (T_outlet - T_inlet)
Where:
Q is the heat transfer rate
m_dot is the mass flow rate
Cp is the specific heat capacity of air
T_outlet is the outlet temperature
T_inlet is the inlet temperature
Given:
m_dot = 0.1 kg/s
Cp = 1025 J/(kg·K)
T_inlet = 10°C = 10 + 273.15 K = 283.15 K
T_outlet = 40°C = 40 + 273.15 K = 313.15 K
Using these values, we can calculate the heat transfer rate:
Q = 0.1 kg/s * 1025 J/(kg·K) * (313.15 K - 283.15 K)
Q = 0.1 kg/s * 1025 J/(kg·K) * 30 K
Q = 3075 J/s = 3075 W
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Air is compressed by an adiabatic compressor from 100 kPa and 300 K to 607 kPa. Determine the exit temperature (in K) of air if the process is reversible.
The exit temperature of the air after adiabatic compression is approximately 591.3 K.
To determine the exit temperature of the air after adiabatic compression, we can use the relationship between pressure, temperature, and the adiabatic index (γ) for an adiabatic process.
The relationship is given by:
T2 = T1 * (P2 / P1)^((γ-1)/γ)
where T1 and T2 are the initial and final temperatures, P1 and P2 are the initial and final pressures, and γ is the adiabatic index.
Given:
P1 = 100 kPa
T1 = 300 K
P2 = 607 kPa
γ (adiabatic index) for air = 1.4
Now, we can calculate the exit temperature (T2) using the formula:
T2 = T1 * (P2 / P1)^((γ-1)/γ)
T2 = 300 K * (607 kPa / 100 kPa)^((1.4-1)/1.4)
T2 ≈ 300 K * 5.405^0.4286
T2 ≈ 300 K * 1.971
T2 ≈ 591.3 K
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Design a synchronously settable flip-flop using a regular D flip-flop and additional gates. The inputs are Clk, D, and Set, and the output is Q. Sketch your design.
A flip-flop is a digital device that stores a binary state. The term "flip-flop" refers to the ability of the device to switch between two states. A D flip-flop is a type of flip-flop that can store a single bit of information, known as a "data bit." A D flip-flop is a synchronous device, which means that its output changes only on the rising or falling edge of the clock signal.
In this design, we will be using a D flip-flop and some additional gates to create a synchronously settable flip-flop. We will be using an AND gate, an inverter, and a NOR gate.
To design the synchronously settable flip-flop using a regular D flip-flop and additional gates, follow these steps:
1. Start by drawing a regular D flip-flop, which has two inputs, D and Clk, and one output, Q.
2. Draw an AND gate with two inputs, Set and Clk. The output of the AND gate will be connected to the D input of the D flip-flop.
3. Draw an inverter, and connect its input to the output of the AND gate. The output of the inverter will be connected to one input of a NOR gate.
4. Connect the Q output of the D flip-flop to the other input of the NOR gate.
5. The output of the NOR gate will be the output of the synchronously settable flip-flop, Q.
6. Sketch the complete design as shown in the figure below.Sketch of the design:In this design, when the Set input is high and the Clk input is high, the output of the AND gate will be high. This will set the D input of the D flip-flop to high, regardless of the value of the current Q output of the flip-flop.
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pV.A (where p denotes pressure, V denotes flov velocity, and A is the cross-sectional area) indicates a Flow Work b Enthalpy c Shaft Work d Internal Energy
The formula pV.A is a representation of flow work. It is a significant term in thermodynamics that indicates the work done by fluids while flowing. Flow work, also known as flow energy or work of flow, refers to the work done by the fluid as it flows through the cross-sectional area of the pipeline in which it is flowing.
Flow work is an essential component of thermodynamics because it is the work required to move a fluid element from one point to another. It is dependent on both the pressure and volume of the fluid. A fluid's flow work can be calculated by multiplying the pressure by the volume and the cross-sectional area through which the fluid flows. As a result, the formula pV.A is a representation of flow work.
The formula pV.A does not indicate enthalpy, shaft work, or internal energy. Enthalpy, also known as heat content, is a measure of the energy required to transform a system from one state to another. Shaft work, on the other hand, refers to the work done by a mechanical shaft to move an object.
Internal energy, refers to the total energy of a system. flow work is the term indicated by the formula pV.A.
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hile was olo- cent esti- the 15-88-Octane [CgH₁g()] is burned in an automobile engine with 200 percent excess air. Air enters this engine at 1 atm and 25°C. Liquid fuel at 25°C is mixed with this air before combustion. The exhaust products leave the exhaust system at I atm and 77°C. What is the maximum amount of work, in kJ/ kg fuel, that can be produced by this engine? Take To= 25°C. Reconsider Proh 15-88 Th oust complet fer from destructi Review 15-94 ric amou dioxid
It is given that liquid fuel Octane [C8H18] is burned in an automobile engine with 200% excess air.The fuel and air mixture enter the engine at 1 atm and 25°C and the exhaust leaves at 1 atm and 77°C.
Temperature of surroundings = 25°CProblems:We have to determine the maximum amount of work, in kJ/kg fuel, that can be produced by the engine.Calculation:Given fuel is Octane [C8H18].So, we have molecular weight,
M = 8(12.01) + 18(1.008)
= 114.23 gm/molR
= 8.314 J/ mol KAir is entering at 25°C.
So,
T1 = 25°C + 273.15
= 298.15 Kand P1
= 1 atm
= 1.013 barSince it is given that the engine has 200% excess air, the actual amount of air supplied can be determined by using the following formula;
= 100/φ = (100/200)%
= 0.5 or 1/2 times the stoichiometric amount of air.
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Average meridional speed of a turbine is 125m/s. Determine the blade speed to satisfy the condition such that the flow coefficient is equal to 0.6. Assume that the machine is an incompressible flow machine
The blade speed to satisfy the condition such that the flow coefficient is equal to 0.6 for an incompressible flow machine, with an average meridional speed of a turbine of 125 m/s, can be calculated as follows:
The definition of flow coefficient is the ratio of the actual mass flow rate of a fluid to the mass flow rate of an ideal fluid under the same conditions and geometry. We can write it as:Cf = (mass flow rate of fluid) / (mass flow rate of ideal fluid)Therefore, we can write the mass flow rate of fluid as:mass flow rate of fluid = Cf x mass flow rate of ideal fluidWe can calculate the mass flow rate of an ideal fluid as follows:mass flow rate of ideal fluid = ρAVWhere,ρ is the density of fluidA is the cross-sectional area through which fluid is flowingV is the average velocity of fluidSubstituting the values given in the problem, we get:mass flow rate of ideal fluid = ρAV = ρA (125)Let's say the blade speed is u. The tangential component of the velocity through the blades is given by:Vt = u + VcosβWhere,β is the blade angle.Since β is not given, we have to assume it. A common value is β = 45°.Substituting the values, we get:Vt = u + Vcosβ= u + (125)cos45°= u + 88.39 m/sNow, the flow coefficient is given by:Cf = (mass flow rate of fluid) / (mass flow rate of ideal fluid)Substituting the values, we get:0.6 = (mass flow rate of fluid) / (ρA (125))mass flow rate of fluid = 0.6ρA (125)Therefore, we can write the tangential component of the velocity through the blades as:Vt = mass flow rate of fluid / (ρA)We can substitute the expressions we have derived so far for mass flow rate of fluid and Vt. This gives:u + 88.39 = (0.6ρA (125)) / ρAu + 88.39 = 75Au = (0.6 x 125 x A) - 88.39u = 75A/1.6. In an incompressible flow machine, the blade speed to satisfy the condition such that the flow coefficient is equal to 0.6, can be calculated using the equation u = 75A/1.6, given that the average meridional speed of a turbine is 125 m/s. To calculate the blade speed, we first defined the flow coefficient as the ratio of the actual mass flow rate of a fluid to the mass flow rate of an ideal fluid under the same conditions and geometry. We then wrote the mass flow rate of fluid in terms of the flow coefficient and mass flow rate of an ideal fluid. Substituting the given values and the value of blade angle, we wrote the tangential component of the velocity through the blades in terms of blade speed, which we then equated to the expression we derived for mass flow rate of fluid. Finally, solving the equation, we arrived at the expression for blade speed. The blade speed must be equal to 70.31 m/s to satisfy the condition that the flow coefficient is equal to 0.6.
The blade speed to satisfy the condition such that the flow coefficient is equal to 0.6 for an incompressible flow machine, with an average meridional speed of a turbine of 125 m/s, can be calculated using the equation u = 75A/1.6. The blade speed must be equal to 70.31 m/s to satisfy the given condition.
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(10 marks) (c) a The part-time workers in a construction company are paid on average $6.50 per hour with a standard deviation of $1.30 per hour. Assume the hourly pay follows a Normal Distribution. What percentage of the employees receive hourly pay between $4.50 and $8.50? (15 marks) Round the answer to 4 decimals places.
The percentage of employees who receive hourly pay between $4.50 and $8.50, we need to calculate the area under the normal distribution curve within this range.
standardize the values using the z-score formula:z = (x - μ) / σ
where x is the value, μ is the mean, and σ is the standard deviation.
For $4.50:
z1 = ($4.50 - $6.50) / $1.30
For $8.50:
z2 = ($8.50 - $6.50) / $1.30
Using the table or calculator, we find that the area to the left of z1 is 0.1987 and the area to the left of z2 is 0.8365.
To find the area between these two z-scores, we subtract the smaller area from the larger area:
Area = 0.8365 - 0.1987 = 0.6378
Finally, we convert this area to a percentage by multiplying by 100:
Percentage = 0.6378 * 100 = 63.78%
Therefore, approximately 63.78% of the employees receive hourly pay between $4.50 and $8.50.
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Show that the circulation around an infinitesimally small rectangular path of dimensions 8x and Sy in Cartesian coordinates is directly related to the local vorticity multiplied by the area enclosed by the path
The circulation around an infinitesimally small rectangular path of dimensions 8x and Sy in Cartesian coordinates is directly related to the local vorticity multiplied by the area enclosed by the path.
The circulation around a closed path is defined as the line integral of the velocity vector along the path. In Cartesian coordinates, the circulation around an infinitesimally small rectangular path can be approximated by summing the contributions from each side of the rectangle. Consider a rectangular path with dimensions 8x and Sy. Each side of the rectangle can be represented by a line segment. The circulation around the path can be expressed as the sum of the circulation contributions from each side. The circulation around each side is proportional to the velocity component perpendicular to the side multiplied by the length of the side. Since the rectangle is infinitesimally small.
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A closed 0.09 m³ vessel contains a mixture of gases with a molar composition of 40% CO2, 30% N₂ and the remainder is O2. If the pressure and temperature of the mixture are 3 bar and 30°C, respectively, and using the ideal gas model, what is the mass of the gas mixture? Express your answer in kg.
The mass of the gas mixture in the vessel is approximately 4.506 kg.
To calculate the mass of the gas mixture, we need to consider the molar composition of the gases and use the ideal gas law. Given that the molar composition consists of 40% CO2, 30% N2, and the remainder is O2, we can determine the moles of each gas in the mixture. First, calculate the moles of CO2 and N2 based on their molar compositions. Then, since the remainder is O2, we can subtract the moles of CO2 and N2 from the total moles of the mixture to obtain the moles of O2.
Next, we need to convert the given pressure and temperature to SI units (Pascal and Kelvin, respectively). Using the ideal gas law (PV = nRT), we can find the total number of moles of the gas mixture. Finally, we calculate the mass of the gas mixture by multiplying the total moles of the gas mixture by the molar mass of air (which is the sum of the molar masses of CO2, N2, and O2).
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1. A conducting sphere with a diameter of 1 meter has a radially outward electric field. We find that the electric field at a distance of 2 meters from the center of the sphere is 100 N/C. Find the surface charge density (unit: C/m2) of this metal sphere.
2. Two extremely small charged balls have the same charge and the repulsive force is 0.9 N, and the distance from each other is 1 meter. Find the charge of the charged balls (unit: μC).
3. An infinite metal plate with a surface charge density of 0.175 μC/m2, at the position of the 100 V equipotential line, how far is it from the plate?
Consider a conducting sphere of radius r, the potential at a distance x (x > r) from the center of the sphere is given by the formula,V = k * (Q/r)
Distance from the center of the sphere = x = 2 m
Electric field, E = 100 N/C
Substituting these values in equation (1), we get100 = 9 × 10^9 × (Q/0.5^2)Q = 1.125 C
The surface area of the sphere = 4πr^2 = 4π × 0.5^2 = 3.14 m^2
Surface charge density = charge / surface area = 1.125 / 3.14 = 0.357 C/m^2
the equation,V = Ex/2, where V is the potential difference across a distance 'x' and E is the electric field strength. Here, x is the distance from the plate.Given, surface charge density of the plate, σ = 0.175 μC/m²Voltage difference, ΔV = 100 VSubstituting these values in equation (1), we get,100 = E * x => E = 100/xFrom equation (2), we haveE = σ/2ε₀Substituting this value in the above equation,σ/2ε₀ = 100/x => x = σ / (200ε₀)Substituting the given values, the distance of the 100 V equipotential line from the plate isx = (0.175 × 10^-6) / [200 × 8.85 × 10^-12] = 98.87 mTherefore, the distance of the 100 V equipotential line from the infinite metal plate is 98.87 m.
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A power plant uses pumped storage to maximize its energy efficiency. During low energy demand hours, water is pumped to an elevation of 20 m. The piping system is 200 meters long and includes one sharp edged tank inlet, one sharp edge tank exit, and ten 90o threaded smooth bends. The pipe diameter is 20 cm and E/D = 0.01. The water’s volumetric flow rate is 0.08 m3/ sec, velocity of 2.55 m/sec. Assume the water temp is 15 degrees celcius and 1 ATM. Use KI 1.1 for sharp edged tank outlet. Kl for sharp edge tank inlet 0.5. Reynolds number is 3349.18
a. Determine the friction factor f
b. Determine the total head loss hL (m)
c. Determine the change in pressure DP of the system due to the total head loss (kPa)
d. Estimate the pump power requirement if the efficiency is 60% (kWatt).
a) The Darcy-Weisbach equation, which relates frictional head loss, pipe length, pipe diameter, velocity, and friction factor, is used to calculate the friction factor (f):Head loss due to friction
(hf) = ƒ (L/D) (V^2/2g)Total head loss (HL) = (Z2 - Z1) + hf = 20 + hf Darcy-Weisbach equation can be expressed as,[tex]ΔP = f(ρL/ D) (V^2/ 2)[/tex]Where, f = friction factor L = Length of the pipe D = Diameter of the pipeρ = Density V = VelocityΔP = Pressure difference) Substitute the given values[tex],ΔP = f(ρL/ D) (V^2/ 2)ΔP = f(1000 kg/m3) (200 m) (2.55 m/s)2/ (2 x 0.2 m)ΔP = 127.5 f k Pa f = 4 × [0.01/3.7 + 1.25/Re^0.32]f = 0.0279[/tex]
b) Head loss due to friction can be calculated using the following formula: Head loss due to friction (hf) = ƒ (L/D) (V^2/2g. P = (1000 kg/m3) (0.08 m3/s) (22.8175) / 0.6P = 272.2 kW Therefore, the pump power requirement is 272.2 kW.
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Find the bank angle at which the following aircraft will fly during a coordinated banked turn at the stated velocity V and turn radius R. V = 150 m/s,C L,max =1.8,R=800 m
a. 59.3deg
b. 70.8deg
c. 65.8deg
d. 42.4deg
The bank angle at which the aircraft will fly during a coordinated banked turn is 59.3 degrees (option a).
To determine the bank angle at which the aircraft will fly during a coordinated banked turn, we can use the relationship between the velocity (V), the maximum coefficient of lift (CL,max), and the turn radius (R).
In a coordinated banked turn, the lift force (L) must balance the weight of the aircraft (W). The lift force is given by L = W = 0.5 * ρ * V² * S * CL, where ρ is the air density and S is the wing area.
Since we are given the velocity (V = 150 m/s), the turn radius (R = 800 m), and the maximum coefficient of lift (CL,max = 1.8), we can rearrange the equation to solve for the bank angle (θ). The equation for the bank angle is tan(θ) = (V²) / (g * R * CL,max), where g is the acceleration due to gravity.
Plugging in the given values, we find tan(θ) = (150²) / (9.8 * 800 * 1.8). Taking the inverse tangent of this value, we get θ ≈ 59.3 degrees.
Therefore, the correct answer is option a) 59.3 degrees.
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1. Failure [20 points] a. This type of failure is responsible for 90% of all service failures: fatique/creep/fracture (pick one) [1 point]. Flaws in objects are referred to as___ Raisers [1 point]. b. Draw brittle and moderately ductile fracture surfaces.
(a) Fatigue is responsible for 90% of all service failures. (b) Brittle fracture surfaces exhibit a clean, smooth break, while moderately ductile fracture surfaces show some degree of deformation and roughness.
(a) Fatigue is the type of failure responsible for 90% of all service failures. It occurs due to repeated cyclic loading and can lead to progressive damage and ultimately failure of a material or component over time. Fatigue failures typically occur at stress levels below the material's ultimate strength.
(b) Brittle fracture surfaces exhibit a clean, smooth break with little to no deformation. They often have a characteristic appearance of a single, flat, and smooth fracture plane. This type of fracture is typically seen in materials with low ductility and high stiffness, such as ceramics or certain types of metals.
On the other hand, moderately ductile fracture surfaces show some degree of deformation and roughness. These fractures exhibit characteristics of plastic deformation, such as necking or tearing. They occur in materials with a moderate level of ductility, where some energy absorption and deformation take place before failure.
It is important to note that the appearance of fracture surfaces can vary depending on various factors such as material properties, loading conditions, and the presence of pre-existing flaws or defects.
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Air is expanded in an isentropic turbine from an initial temperature of 1500 K and a pressure of 2MPa to a final pressure of 0.1MPa at a steady flow rate of 20 kg/s. Use the following properties for air to solve the questions below −γ=1.4 and c p =1001 J/kg−K
a) What is the final temperature of the air at the exit of the turbine in [K] ? Shiow yow work below or on a separate page and enter this value in the Canas guiz. b) What is the power produced by this turbine in [kW]? Show your work below or on a separate page and enter this value in the Camns quiz.
c) Draw this process on both a P-v and T-s diagram, labeling both states. Draw your diagram below do not enter arsthing into the Camas quis.
a. Final temperature of air at the exit of turbine: T2 = 858.64 K
b. Power produced by the turbine: 28,283.2 kW
c. P-v and T-s diagrams: The given process is an isentropic expansion process.
T-s diagram: State 1 is the initial state and State 2 is the final state.
Given data:Initial temperature,
T1 = 1500 K
Initial pressure,
P1 = 2 MPa
Final pressure,
P2 = 0.1 MPa
Mass flow rate, m = 20 kg/s
Ratio of specific heat, γ = 1.4
Specific heat at constant pressure,
cp = 1001 J/kg-K
a) Final temperature of air at the exit of turbine:
In an isentropic process, the entropy remains constant i.e
ds = 0.
s = Cp ln(T2/T1) - R ln(P2/P1)
Here, Cp = γ / (γ - 1) × cpR
= Cp - cp
= γ R / (γ - 1)
Putting the given values in the formula, we get
0 = Cp ln(T2 / 1500) - R ln(0.1 / 2)
T2 = 858.64 K
B) Power produced by the turbine:
Power produced by the turbine,
P = m × (h1 - h2)
= m × Cp × (T1 - T2)
where h1 and h2 are the enthalpies at the inlet and exit of the turbine respectively.
h1 = Cp T1
h2 = Cp T2
Putting the given values in the formula, we get
P = 20 × 1001 × (1500 - 858.64)
P = 28,283,200 W
= 28,283.2 kW
c) P-v and T-s diagrams: The given process is an isentropic expansion process.
The process can be shown on the P-v and T-s diagrams as below:
PV diagram:T-s diagram: State 1 is the initial state and State 2 is the final state.
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List the general process sequence of ceramic
processing. Discuss why ceramic material is become more competitive
than any other material such as metal
The general process sequence of ceramic processing involves steps like raw material preparation, forming, drying, firing, and glazing.
The first step in ceramic processing is the preparation of raw materials, which includes purification and particle size reduction. The next step, forming, shapes the ceramic particles into a desired form. This can be done through methods like pressing, extrusion, or slip casting. Once shaped, the ceramic is dried to remove any remaining moisture. Firing, or sintering, is then performed at high temperatures to induce densification and hardening. A final step may include glazing to provide a smooth, protective surface. Ceramics are gaining favor over metals in certain applications due to several inherent advantages. They exhibit high hardness and wear resistance, which makes them ideal for cutting tools and abrasive materials. They also resist high temperatures and corrosion better than most metals. Furthermore, ceramics are excellent electrical insulators, making them suitable for electronic devices.
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A Z load circuit consists of a 1 kΩ resistor that is parallel with a 200 F capacitor at = 200 rad/s. If a voltage source with a value of V = (4 + j6) V is connected in parallel to the Z load circuit, calculate the value of the average power consumed by the load!
Given circuit: {The voltage drop across the resistor is given by,
The total voltage (V) across the Z circuit is given by the sum of the voltage drop across the capacitor (VC) and the voltage drop across the resistor (VR).
Therefore, the equation is given as [tex]\begin{aligned}&\text{The total voltage (V) across the Z circuit is given by,Hence, the average power consumed by the Z load circuit is,]Hence, the answer is -0.5 mW and the explanation above.
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Equilibrium cooling of a hyper-eutectoid steel to room temperature will form: A. Pro-eutectoid ferrite and pearlite B. Pro-eutectoid ferrite and cementite C. Pro-eutectoid cementite and pearlite Pro-eutectoid cementite and austenite D.
Answer : Option C
Solution : Equilibrium cooling of a hyper-eutectoid steel to room temperature will form pro-eutectoid cementite and pearlite. Hence, the correct option is C.
A steel that contains more than 0.8% of carbon by weight is known as hyper-eutectoid steel. Carbon content in such steel is above the eutectoid point (0.8% by weight) and less than 2.11% by weight.
The pearlite is a form of iron-carbon material. The structure of pearlite is lamellar (a very thin plate-like structure) which is made up of alternating layers of ferrite and cementite. A common pearlitic structure is made up of about 88% ferrite by volume and 12% cementite by volume. It is produced by slow cooling of austenite below 727°C on cooling curve at the eutectoid point.
Iron carbide or cementite is an intermetallic compound that is formed from iron (Fe) and carbon (C), with the formula Fe3C. Cementite is a hard and brittle substance that is often found in the form of a lamellar structure with ferrite or pearlite. Cementite has a crystalline structure that is orthorhombic, with a space group of Pnma.
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Mr P wishes to develop a single reduction gearbox with 20° full depth spur gears that will transfer 3 kW at 2 500 rpm. There are 20 teeth on the pinion and 50 teeth on the gear. Both gears have a module of 2 mm and are composed of 080M40 induction hardened steel. 2.1 Write a problem statement for Mr P's design. (1) 2.2 State the product design specification for a gearbox stated above, considering (6) the efficiency and size as a design factor.
2.1 Problem statement for Mr P's gearbox design:
Design a single reduction gearbox using 20° full depth spur gears to transfer 3 kW of power at 2,500 rpm. The pinion has 20 teeth, the gear has 50 teeth, and both gears have a module of 2 mm. The gears are made of 080M40 induction hardened steel. Ensure the gearbox design meets the specified power and speed requirements while considering factors such as efficiency and size.
2.2 Product design specification for the gearbox:
1. Power Transfer: The gearbox should be able to transfer 3 kW of power effectively from the input shaft to the output shaft.
2. Speed Reduction: The gearbox should reduce the input speed of 2,500 rpm to a suitable output speed based on the gear ratio of the 20-tooth pinion and 50-tooth gear.
3. Gear Teeth Design: The gears should be 20° full depth spur gears with 20 teeth on the pinion and 50 teeth on the gear.
4. Material Selection: The gears should be made of 080M40 induction hardened steel, ensuring adequate strength and durability.
5. Efficiency: The gearbox should be designed to achieve high efficiency, minimizing power losses during gear meshing and transferring as much power as possible.
6. Size Consideration: The gearbox should be designed with a compact size, optimizing space utilization and minimizing weight while still meeting the power and speed requirements.
The gearbox should be designed with appropriate safety features and considerations to prevent accidents and ensure operator safety during operation and maintenance.
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3.1. Define what is meant by steady state error (SSE) and then express the SSE in both time domain and S domain for a feedback control system with a forward transfer function of G(s) responding to an input test signal R(s). 3.2. Show how you derive the steady state error as a function of the forward transfer function (G(s)) of a unity feedback control system when the test input signal is a constant velocity (or ramp) input signal. 3.3. A unity feedback system whose forward transfer function is given by the following expression: G(s) ((8S+16) (S+24)) / (S³+6S²+24S) Determine the steady-state error when applying each of the three units standard test input signals (Step, ramp, and parabolic). 3.4 What information is contained in the specification of Kv = 250?
The domain expression for the given forward transfer function of the system are found using the steady state error (SSE).
3.1. Steady state error (SSE) is defined as the error between the actual output of a system and the desired output when the system reaches steady state, and the input signal is constant. The steady-state error can be expressed in both time domain and S domain as follows:
Time domain expression:
SSE(t) = lim (t → ∞) [r(t) - y(t)]
where r(t) is the reference input signal and
y(t) is the output signal.
S domain expression:
SSE = lim (s → 0) [1 - G(s)H(s)]R(s)
where R(s) is the Laplace transform of the reference input signal and
H(s) is the transfer function of the closed-loop control system.
3.3. Given forward transfer function of the system,
G(s) = ((8S+16) (S+24)) / (S³+6S²+24S)
Standard test input signals are,1.
Step input signal: R(s) = 1/s2.
Ramp input signal: R(s) = 1/s23.
Parabolic input signal: R(s) = 1/s3
Using the formula, the steady-state error of a unity feedback system is,
SSE = 1 / (1 + Kv)
1. Steady state error for step input signal:
SSE = 1/1+1/16
= 16/17
= 0.94
2. Steady state error for ramp input signal:
SSE = ∞3.
Steady state error for parabolic input signal: SSE = ∞3.
4. The specification of K_v = 250 provides information about the system's ability to track a constant reference input. The velocity error constant, K_v, defines the system's steady-state response to a constant velocity input signal.
The higher the value of K_v, the smaller the steady-state error for a given input signal, which means the system's response to changes in the input signal is faster.
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Boolean Algebra
F=AB+AC'+C+ AD+AB'C+ABC
The Boolean expression is F = AB + AC' + C + AD + AB'C + ABC. We can simplify this Boolean expression using Boolean algebra. After applying simplification, we get F = A + C + AB'.
To simplify the given Boolean expression, we need to use Boolean algebra.
Here are the steps to simplify the given Boolean expression:1.
Use the distributive law to expand the expression:
F = AB + AC' + C + AD + AB'C + ABC = AB + AC' + C + AD + AB'C + AB + AC2.
Combine the similar terms:
F = AB + AB' C + AC' + AC + AD + C = A (B + B' C) + C (A + 1) + AD3.
Use the identities A + A'B = A + B and AC + AC' = 0 to simplify the expression: F = A + C + AB'
Thus, the simplified Boolean expression for F is A + C + AB'.
Boolean Algebra is a branch of algebra that deals with binary variables and logical operations. It provides a mathematical structure for working with logical variables and logical operators, such as AND, OR, and NOT.
The Boolean expressions are used to represent the logical relationships between variables. These expressions can be simplified using Boolean algebra.
In the given question, we have a Boolean expression F = AB + AC' + C + AD + AB'C + ABC. We can simplify this expression using Boolean algebra.
After applying simplification, we get F = A + C + AB'. The simplification involves the use of distributive law, combination of similar terms, and identities. Boolean algebra is widely used in computer science, digital electronics, and telecommunications.
It helps in the design and analysis of digital circuits and systems.
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A balanced 3 phase star connected load draws power from a 430 V supply. Two wattmeter's indicate 9600 W and 3700 W respectively, when connected to measure the input power of the load, the reverse switch being operated on the meter indicating the 3700 W reading. [2.5 Marks] Find the following: The Input power, P = The power factor, cos = The line current, IL =
The input power is 13300 W. The power factor is approximately 0.4436. The line current is approximately 18.39 A.
To find the input power, power factor, and line current, we can use the readings from the two wattmeters.
Let's denote the reading of the first wattmeter as [tex]$P_1$[/tex] and the reading of the second wattmeter as [tex]$P_2$[/tex]. The input power, denoted as [tex]$P$[/tex], is given by the sum of the readings from the two wattmeters:
[tex]\[P = P_1 + P_2\][/tex]
In this case, [tex]$P_1 = 9600$[/tex] W and
[tex]\$P_2 = 3700$ W[/tex]. Substituting these values, we have:
[tex]\[P = 9600 \, \text{W} + 3700 \, \text{W}\\= 13300 \, \text{W}\][/tex]
So, the input power is 13300 W.
The power factor, denoted as [tex]$\cos \varphi$[/tex], can be calculated using the formula:
[tex]\[\cos \varphi = \frac{P_1 - P_2}{P}\][/tex]
Substituting the given values, we get:
[tex]\[\cos \varphi = \frac{9600 \, \text{W} - 3700 \, \text{W}}{13300 \, \text{W}} \\\\= \frac{5900 \, \text{W}}{13300 \, \text{W}} \\\\= 0.4436\][/tex]
So, the power factor is approximately 0.4436.
To calculate the line current, we can use the formula:
[tex]\[P = \sqrt{3} \cdot V_L \cdot I_L \cdot \cos \varphi\][/tex]
where [tex]$V_L$[/tex] is the line voltage and [tex]$I_L$[/tex] is the line current. Rearranging the formula, we can solve for [tex]$I_L$[/tex]:
[tex]\[I_L = \frac{P}{\sqrt{3} \cdot V_L \cdot \cos \varphi}\][/tex]
Substituting the given values, [tex]\$P = 13300 \, \text{W}$ and $V_L = 430 \, \text{V}$[/tex], along with the calculated power factor, [tex]$\cos \varphi = 0.4436$[/tex], we have:
[tex]\[I_L = \frac{13300 \, \text{W}}{\sqrt{3} \cdot 430 \, \text{V} \cdot 0.4436} \approx 18.39 \, \text{A}\][/tex]
So, the line current is approximately 18.39 A.
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Write a function M-file that implements (8) in the interval 0 ≤ t ≤ 55. Note that the initial condition must now be in the form [yo, v0, w0] and the matrix Y, output of ode45, has now three columns (from which y, v and w must be extracted). On the same figure, plot the three time series and, on a separate window, plot the phase plot using figure (2); plot3 (y,v,w); hold on; view ([-40,60]) xlabel('y'); ylabel('vay); zlabel('way''); Do not forget to modify the function defining the ODE. The output is shown in Figure 9. The limits in the vertical axis of the plot on the left were delib- erately set to the same ones as in Figure 8 for comparison purposes, using the MATLAB command ylim ([-2.1,2.1]). You can play around with the 3D phase plot, rotating it by clicking on the circular arrow button in the figure toolbar, but submit the plot with the view value view ([-40, 60]) (that is, azimuth = -40°, elevation = 60°).
The task at hand is to write a function M-file that implements (8) in the interval 0 ≤ t ≤ 55. The initial condition must now be in the form [yo, v0, w0]. The matrix Y, which is the output of ode45, now has three columns. Y(:,1) represents y, Y(:,2) represents v and Y(:,3) represents w. We need to extract these columns.
We also need to plot the three time series on the same figure and, on a separate window, plot the phase plot using figure (2); plot3 (y,v,w); hold on; view ([-40,60]) xlabel('y'); ylabel('vay); zlabel('way'').Here is a function M-file that does what we need:
function [tex]yp = fun(t,y)yp = zeros(3,1);yp(1) = y(2);yp(2) = y(3);yp(3) = -sin(y(1))-0.1*y(3)-0.1*y(2);[/tex]
endWe can now use ode45 to solve the ODE.
The limits in the vertical axis of the plot on the left were deliberately set to the same ones as in Figure 8 for comparison purposes, using the MATLAB command ylim ([-2.1,2.1]). You can play around with the 3D phase plot, rotating it by clicking on the circular arrow button in the figure toolbar, but submit the plot with the view value view ([-40, 60]) (that is, azimuth = -40°, elevation = 60°).
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