In terms of sustainability, what is lifecycle of a product? What are the stages of lifecycle and why each cycle is important?

Consider a gas turbine engine, fueled by natural gas, for generating electricity.

A.) Calculate the adiabatic flame temperature for this system, assuming we’ll use about 110% TA.

B.) Estimate (calculate) the power output for this turbine, per lbm or kg of air.

C.) If I’d like to provide the generator with 12,000 shp (shaft horsepower), what air mass flow do I need?

D.) If this is an open cycle turbine, the exhaust gas has considerable remaining energy. How much heat rejection is there in the exhaust gas?

E.) Is it worth recovering some of that exhaust energy? How might I do it?

why is edge bead more common in thick SU-8 compared to thin Shipley 1827? How can we minimize the edge bead problem (describe all possible methods)? What kind of issues does edge bead produce in soft bake and exposure?

A given machining operation is being performed and managements wants to know the cost for performing the work. The information you’ve collected shows the following: Machining Time = 7.680 min., Part Handling Time = 2.650 min., and the Tool Change Time = 15.535 min. The tool requires changing every 585 work pieces and the cost of the cutting tool is $100.75 per tool. The hourly rate for performing the machining and handling within the operation is $118.84 per hour. Determine the total cost required to perform the operation per part.

Nanotechnology:
Explain how does the minimum thickness of the resist layer can change when taking into account doping concentrations in the ion-implanted layers.

Write and upload a MATLAB script to do the following.

Compute the sequence S(n+1) = (2 – K) S(n) – S(n-1) ;   Assume S(1) = 0, S(2) = 1;

(a)    Case 1, Assume K = 1

(b)    Case 2, Assume K = 2

(c)     Case 3, Assume K = 4

Plot all of these on the same plot, for N = 1 to 20

Convection Heat transfer internal flow

Consider water flowing in a heated tube. The tube is 14 m long with an inner diameter of 1 cm. The heat
is added at 1500 W/m2 uniformly along the tube. Water flows at 0.3 m/s. Use the following water property
? = 1000 kg/m³, ? = 1.4 × 10^?3 kg/m·s, cp = 4.2 kJ/kg·K, k = 0.58 W/m·K, and determine

1. Heat transfer coefficient at the tube exit.
2. Tube surface temperature at the exit, with the mean inlet temperature of water at 7°C.

Question 1: (true or false)

a- It is unnecessary to account for surface forces when writing the momentum equation for control volume (True) (false)

b- in the course of Fluid Mechanics, we studied fluid on the ‘continuum’ not the ‘atomistic’ level. (True) (false)

c- Bernoulli’s equation can be appropriately applied for flow through machinery, such as a turbine, compressor, or mixer. (True) (false)

d- The Reynolds number balances pressure with viscose force.(True) (false)

e- The Reynolds number has the dimension of force. .(True) (false)

f- Flow similarity is achieved when the flow are geometrically similar, kinematically similar, dynamically similar, and in the same flow regime. (True) (false)

Quastion 1:

choose the right answer for the following questions:

a) Euler’s equation arises from neglecting the …………. Terms in the more general Navier-Stokes equations.

1- Density 2- Pressure 3-Viscosity 4-None

b) A……………. is used to decelerate a flowing fluid to zero by a frictionless process, thereby allowing the measurement of stagnation pressure.

1-Static pressure probe 2-pitot tube 3-orifice plate 4-none

c) There is a flow probe that depend on 5 parameters and has 3 independent Dimensions. How many pi parameters will that flow problem have?

1-3 2-5 3-2 4-Not enough information

D) The Reynolds number compares initial to ……   effect in a flow problem.

1- Pressure 2- Surface tension 3-Viscus 4- none  

Hot air flows with a mass flow rate of 0.05 kg/s through an insulated square duct with side of 0.15m, the hot air enters at 103 ^oC and after a distance of 5m, cools to 85 ^oC. The heat transfer coefficient between the duct outer surface and the ambient air (T_air = 0 ^oC) is 6 W/m² K.

Calculate the heat transfer coefficient between hot air and duct inner wall.

Air Cp = 1.011 KJ/kg K; air k = 0.0306 W/m K, air viscosity = 211.7*10 ^-7 Ns/m2; air Pr = 0.698

The American novelist James Baldwin wrote, "Words like freedom, justice, democracy are not common concepts; on the contrary, they are rare. People are not born knowing what these are. It takes enormous and, above all, individual effort to arrive at the respect for other people that these words imply." Do you think you know what the words (freedom, justice, and democracy) mean? How did you derive your own meaning for these words?

Create a script that calculates the sine, cosine, and tangent of a vector from 0 to2? with steps of ?/16. The numbers should have three digits to the right of the decimal. Determine an appropriate field width. Use fprintf to display the output in tabular format with the following headers. x sin(x) cos(x) tan(x) Also, plot the three equations in the same figure window, but on separate axes. Plot all thee equations from 0 to 2? on the x-axis. Plot the tangent values (y axis) from -5 to 5 only.

Moist air (RH = 60%) at 80^oF enters an Evaporative cooling unit as it enters a greenhouse and leaves at 100% saturation.

How many pounds Water per pound of Air will be required?

Select one:

a. 0.0155 lbs H₂O per lb Air

b. 0.002865 lbs H₂O per lb Air

c. 0.028656 lbs H₂O per lb Air

d. 0.01315 lbs H₂O per lb Air

e. 0.002344 lbs H₂O per lb Air

3. (a) What is the difference between the signal measurement methods in ‘differential mode’ vs ‘single ended measurement’?

A sensor is used to calculate the kinematic attitude of a satellite with respect to a reference frame.

Two stars are observed by the sensor, S1 and S2.

In the reference frame, S1 has coordinates (0, 1, 0) and S2 has coordinates (-1, 0, 0), the three coordinates represent the i,j,k directions in the reference frame.

In the body frame, S1 has coordinates (1 ,0, 0) and S2 has coordinates (0, 1, 0), the three coordinates represent the iB,jB,kB directions in the body frame.

Find the directional cosine matrix which translates the coordinates from the reference frame to the body frame.