What is an autoclave and why would you use one?

3) Sketch a vacuum bag setup (label all the layers). Explain what benefits are gained by vacuum bagging.

1) What are the differences between the wet lay-up approach and the prepreg approach in hand lay-up? Include both process differences and differences in the final product. Make a list.

• Differences  

• Similarities

Use superposition to solve for applied stresses on a cantilever beam

Soybean oil at 30 degress Celsius is to be pumped from an open vat through 60 m of standard galvanized iron pipe (internal diameter of 9 cm) into the top of a stroage tank that is 17 m above the surface of the vat. The pipeline contains 3 type B elbows and a gate valve. It is desired to pump the oil at 13.7 m^3/hr.

1) How much work head must be added by a pump at this pumping rate?

2) Assuming 75% efficiency, what size motor (watt) would the pump require?

3) What percentage of the total frictional head loss is due to pipe friction alone (major losses)?

Consider a light, single-engine, propeller-driven, private airplane, approximately modeled after the Cessna T-41A. The characteristics of the airplane are as follows: wingspan = 35.8 ft, wing area = 174 ft², normal gross weight = 2950 lb, fuel capacity = 65 gal of aviation gasoline, the parasite drag coefficient C_D,0 = 0.025, Oswald efficiency factor = 0.8 and propeller efficiency = 0.8. The power plant comprises one-piston engine of 230 hp at sea level. Calculate the maximum velocity of the airplane at sea level. (Round the final answer to one decimal place.)

5a--Pump cavitation can cause impeller problems. With spectra describe how you would detect it using
vibration analysis. Be sure to include both low and high frequency indications.

5b-Why oil analysis may be required when vibration analysis can help finding the fault? cite and
exqmple.

Mat Lab Question

Mat Lab Question:

%% Q1 (60%)
% Follow the steps below to complete this question.
%
% Step 1: (40%)
% Create a function to perform calculations: +, -, *, or /
% 1.1 The function name should be calc and saved in its file.
% 1.2 The function has three parameters a, b, and op. The op is an
% operator.  
% 1.3 The function returns variable r for the calculation result.
% 1.4 The function should provide the following help text:
% "The calc is a simple calculator. It has three parameters.
% The first two parameters are numerical operands, and the third one
% is an operator +, -, *, or / "
% 1.5 Use the if conditional statement in the funciton to check the operator op
% and compute accordingly.
% Note: Example about the syntax to check a single character: if(op == '+')
% Note: You can test the calc function in the Command Window using the syntax:
% >> calc(5, 3, '+')
% You can display the help text:
% >> help calc
%
% You can check if a division is divided by 0, but this is not required. Hint: use Inf or NaN
%

%% Q2 (15%)
% This question is similar to the requirement in Step 1 of Q1, except the
% following:
% Function name: calc_switch.m
% Here you want to use the switch statement instead of the if statement to check the operator.
% You are not required to do Steps 2-4 in Q1. But you can test this function in the same way.

Dry, compressed air at Tm,i = 85°C, p = 20 atm, with a mass flow rate of m?? = 0.005kg/s, enters a 30-mm- diameter, 5-m-long tube whose surface is at Ts = 25°C.

Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. ?

PD control

1. The equation of motion for the DC motor are given by the equation:

J ¨?m + (B + KbKT Ra ) ? ?m = KT Ra Va (2)

where: J = 0.01kg · m2 , B = 0.001N · m · s, KT = 0.02N · m/A, Kb = 0.02V /s and Ra = 10?.

(a) Suppose that feedback is added to the system to achieve position control of the motor shaft. Given a desired shaft position ?r (the reference), the applied voltage is given by a proportional controller:

Va = K(?r ? ?m) (3)

Where K is the feedback gain. Find the transfer function from ?r to ?m

(b) Can you find some value of K that provides a rise time of less than 4 seconds and keeps the system overshoot less than 20%? Why?

(c) If cannot (for question 2b), can you design a new controller that achieve all the requirements in question 2b? Write down your controller and show any work involved.

Discuss the meaning/importance in 2-3 sentences per term:

(1) Beach or clamshell marks; (2) Chevron pattern; (3) Creep; (4) Endurance limit; (5) Factor of safety; (6) Fatigue life; (7) Fatigue strength; (8) Fracture mechanics; (9) Fracture toughness; (10) Griffith law; (11) Notch sensitivity; (12) S-N curve; (13) Shot peening; (14) Toughness; (15) Weibull distribution; (16) Weibull modulus.

Note: Make sure please to type the answers briefly and clearly.

1-What are the three configuration types of stereoisomers? Sketch portions of a linear polymer molecule that clearly shows each of those three types.

2-What are the two types of geometric isomers? Sketch structures for each of those types using a polymer

Explain the difference between heat treatable aluminum alloys and work hardenable aluminum alloys. Which is more easily cold worked? Why?

One kilogram of Refrigerant 134a vapor initially at 2 bar and 20°C fills a rigid vessel. The vapor is cooled until the temperature becomes -24°C. There is no work during the process.

Let T_o = 20°C, p_o = 0.1 MPa and ignore the effects of motion and gravity.

2. For the refrigerant, determine the change in exergy, in kJ.

Note: for part 1: q=-98.086kj please find part two- the change in exergy in kj

Calculate the number of cycles to failure (Nf) of an aluminum alloy exposed to reverse tensile-compressive loading (N) with a stress amplitude of 150MPa.   A = 2x10^-12.   n = 2.5m.

If initially the length (ao) of the largest crack is 0.75mm and the fracture toughness (Kc) = 35MPA m1/2.