Refrigerant 134a enters a well-insulated nozzle at 14 bar, 60°C, with a
velocity of 37 m/s and exits at 1.2 bar with a velocity of 460 m/s. For steady-state
operation, and neglecting potential energy effects, determine the exit
temperature, in °C.

What are the steps in producing a concrete slab on grade?

Answer the following

a)State any advantages or disadvantages you see in measuring vibrations with a strain gauge as opposed to the other methods we have used. What effect would changes in temperature have on strain gauge readings and is it possible to eliminate this effect? It was briefly mentioned that different bridge configurations can eliminate temperature effects, but what are those effects and how does that work?

b)In order to get the most accurate readings, should a strain gauge have a high stiffness or a low stiffness? Explain.

Concurrent Engineering is a work methodology based on the parallelization of tasks.

Write a short essay (750 words or more) on Concurrent Engineering as part of the product designing process. Your essay should discuss and explain the concept of Concurrent Engineering, in addition to relevant points such as, FOR EXAMPLE:

• Why it is important to set ‘Concurrent Engineering’ during design?

• How does this approach work (for a given generic product)?

• What are the benefits and drawbacks of Concurrent Engineering?

• Other points as well, provide your own input..

The essay should be prepared in a neat format that comprises:

• Attempt this assignment individually.

• Do not copy from your peers, any similar submissions will be nullified • A cover page (with your name and ID number included).

• A short introduction paragraph(s).

• Main text answer referring to course materials.

• Evidence of further free reading from library and peer-reviewed resources (suitable number of references from books and scientific articles).

• Tables, figures, and illustrations whenever needed to further support your answer, and make it more clear, strong, and appealing.

• A short conclusion paragraph(s)

• List of references at end of essay.

• Total number of words at end of essay (does not include references and cover page)

FLUID MECHANICS

The viscosity of water at 20⁰C (68⁰F) is 1.008 cp (centipoises). (A) Compute the absolute viscosity in lb-sec/ft² . (B) If the specific gravity at 20⁰C is 0.998, compute the kinematic viscosity in ft²/sec.

Use:
1 poise = 1 dyne-sec/cm²
1 lb = 444,800 dynes
1 ft = 30.48 cm

(Please provide a brief step explanation since a solution has been already provided, but it isn't clear how they arrived at the final solution. Thank you!)

Using this sample matlab code:

clear all;
clc
A= ????????;
B= ????????;
AUG=[A B];
for L=1:size(A,2)
%Pivoting starts
for k=L:size(AUG,1)
for m=k+1:size(AUG,1)
if abs(AUG(k,L))<abs(AUG(m,L))
temp=AUG(m,:);
AUG(m,:)=?????????;
AUG(k,:)=?????????;
end
end
end
%Pivoting ends
%Gauss Elimination starts
for k=L+1:size(AUG,1)
AUG(k,:)= ????????????????????????????;
AA=AUG(:,1:size(A,2))
BB=AUG(:,size(A,2)+1:end)
end
%Gauss Elimination ends
end

b)Write a MATLAB M-file which performs gauss elimination without pivoting step by step and shows the coefficient matrix in each step. Using cond (X, P) calculate the condition number of the final step coefficient matrix (U matrix).

c) Write a MATLAB M-file which performs gauss elimination with pivoting step by step and shows the coefficient matrix in each step.

d)Using cond (X, P) calculate the condition number of the final step coefficient matrix (U matrix).

A list paragraph is preferable for engineers as it doesn’t require paragraph features as much as text block paragraphs do.

True or False

Atmospheric air enters the heated section of a circular tube at a flow rate of .005 kg/s and a temperature of 20 degrees Celsius. The tube is of diameter D = 50 mm, and fully developed conditions with h = 25 W/m^2K exist over the entire length of L = 3m.

a) For the case of the uniform surface heat flux at q''_s = 1000 W/m² , determine the total heat transfer rate q and the mean temperature of the air leaving the tube T_m,o. What is the value of the surface temperature at the tube inlet T_s,i and the outlet T_s,o? Sketch the axial variation of T_s and T_m. On the same figure, also sketch (qualitatively) the axial variation of T_s and T_m for the more realistic case in which the local convection coefficient varies with x.

b) If the surface heat flux varies linearly with x, such that q''_s(W/m²) = 500x(m), what are the values of q, T_m,o, T_s,i, and T_s,o? Sketch the axial variation of T_s and T_m. On the same figure, also sketch (qualitatively) the axial variation of T_s and T_m for the more realistic case in which the local convection coefficient varies with x.

c) For the two heating conditions of parts (a) and (b), plot the mean fluid and surface temperatures, T_m(x) and T_s(x), respectively, as functions of distance along the tuble. What effect will a fourfold increase in the convection coefficient have on the temperature distributions?

d) For each type of heating process, what heat fluxes are required to achieve an air outlet temperature of 125 degrees Celsius? Plot the temperature distributions.

List 4 issues that need to be considered when selecting a factor of safety in an

engineering design.

2-

What is the difference between yield strength and ultimate tensile strength of a material?

1. Figure 21.4 provides suggested cutting speeds and feeds for turn- ing. You are cutting a wrought carbon steel (1012) at normalized to 100 Bhn and have have selected a high speed steel tool. For a DOC of 150 in., What speed and feed would you select?

2. For problem 1, suppose you selected a speed of 145 sfpm and a feed of 0.015 in. per revolution. The workpiece is 4 in. in diameter.

a. What is the input rpm? b. What is the MRR? c. What is the cutting time for a 6-in. cut?

Only question 2 please.. if you need more info please let me know

The acceleration of certain objects is studied in an experimental test track for automobiles. The distance traveled by an object L is measured as a function of time t to yield the following:
t (s) 0.1 0.2 0.5 1.0 1.5 1.8 2.0 3.0

L (m) 0.26 0.55 1.56 3.90 7.41 10.28 12.6 30.

Obtain a best fit to this data, considering first-, second, and third-order polynomials. Using these polynomials, calculate the values of the dependent variable L at the time intervals employed for the given data to evaluate the accuracy of the polynomial representations. Discuss the results obtained.

Referring to the manual manufacturing method information given in reviewquestion 12, calculate the total annual cost to produce 100,000 parts per year. Note that theannual cost of maintenance for the machine is $16,000. Additionally, the raw material costis $2.50 per part.

1.

a)Which of the seven basic chip formation processes are single point and which are multiple point?

b)Why is metal cutting shear strain such an important parameter?

c)Why does the cutting force Fc increase with increased Feed or DOC?

d) The cutting conditions in a turning operation are: v = 2.1 m/s, f = 3.5 mm/revolution, and d = 0.24mm. The tool rake angle = 5 which produces a deformed chip thickness tc = 0.5 mm. Determine: (a) shear plane angle, (b) shear strain, and (c) material removal rate. Use the orthogonal cutting model as an approximation of the turning process.

The diffusion coefficients for carbon in nickel are given at two temperatures are as follows:

At T= 600°C, D=5.5 × 10^–14 m²/s

At T= 700°C, D=3.9 × 10^–13 m²/s

(a) Determine the values of D₀ and Q_d.

(b) What is the magnitude of D at 850°C?

A 10 ft long double pipe heat exchanger consisting of a 1 in sch 40 (1.315 in OD, 1.029 in ID) inner pipe within a 4 in sch 40 (3.998 in ID) outer pipe uses chilled water to cool hot glycerin (the water flows in the annulus and glycerin in the inner pipe). The pipes are constructed of AISI 302 stainless steel. The mean velocities of the water and glycerin are 4 ft/s and 1.3 ft/s, respectively. If the average bulk temperatures of the water and glycerin are 45 ◦F and 180 ◦F, respectively, compute the overall heat transfer coefficient based on the outer area of the 1 in diameter pipe. Neglect fouling.