Provide a description of the materials selection for the following micro-sensors/actuators:

1.) substrates and wafers

2.) silicon compounds such as dioxide, carbide, nitride, and polycrystalline

3.) silicon piezoelectric

4.) gallium arsenide

5.) piezoelectric crystals

6.) polymers

7.) films

Provide a description of the working principles of the following micro-actuators

1.) thermal forces

2.) shape-memory alloys

3.) piezoelectric

4.) electrostatic

Provide a description of the working principles of the following micro-sensors:

1.) chemical

2.) optical

3.) acoustic wave

4.) pressure

5.) thermal

12.2 Compression of Carbon Dioxide

Carbon dioxide (CO2) at 1 bar and 300 K enters a compressor operating at steady state and is compressed adiabatically to an exit state of 10 bar and 520 K. The CO2 is modelled as an ideal gas, and the KE and PE effects are negligible. For the compressor, determine

a) Work input [kJ/kg]

b) Rate of entropy production [kJ/kg?K]

c) The isentropic compressor efficiency

d) T-s diagram of isentropic and real process

MATLAB

The user is supposed to enter either a ‘yes’ or ‘no’ in response to a prompt. The script will print “OK, continuing” if the user enters either a ‘y’, ‘Y’,'Yes', or 'yes' or it will print “OK, halting” if the user enters a ‘n’, ‘N’, 'No', or 'no' or will print “Error” if the user enters anything else.

Code this twice once with if and once with switch:

Then recode the example above to keep prompting until an an acceptable yes or no is entered:

What loop should we use?

what should we intialize?

please generate all code for Matlab

1.Steam is accelerated by a nozzle steadily from a low velocity to a velocity of 210 m/s at a rate of 3.2 kg/s. If the temperature and pressure of the steam at the nozzle exit are 400 °C and 2 MPa, the exit area of the nozzle is:

Select one:

a. 8.4  cm2

b. 10.2 cm2

c. 23.0 cm2

d. 152 cm2

e. 24.0 cm2

2.An adiabatic heat exchanger is used to heat cold water at 15 °C entering at a rate of 5 kg/s by hot water at 90 °Centering at a rate of 4 kg/s. If the exit temperature of hot water is 50 °C, the exit temperature of cold water is

Select one:

a. 47 °C

b. 55 °C

c. 78 °C

d. 42 °C

e. 90 °C

3.Steam is compressed by an adiabatic compressor from 0.2 MPa and 150 °C to 0.8 MPa and 350 °C at a rate of 1.30 kg/s. The power input to the compressor is:

Select one:

a. 302 kW

b. 717 kW

c. 901 kW

d. 511 kW

e. 393 kW

4.Hot combustion gases (assumed to have the properties of air at room temperature) enter a gas turbine at 1 MPa and 1500 K at a rate of 0.1 kg/s, and exit at 0.2 MPa and 900 K. If heat is lost from the turbine to the surroundings at a rate of 15 kJ/s, the power output of the gas turbine is:

Select one:

a. 45 kW

b. 15 kW

c. 60 kW

d. 75 kW

e. 30 kW

5.Refrigerant -134a expands in an adiabatic turbine from 1.2 MPa and 100 °C to 0.18 MPa and 50 °C at a rate of 1.25 kg/s. The power output of the turbine is:

Select one:

a. 46.3 kW

b. 72.7 kW

c. 66.4 kW

d. 89.2 kW

e. 112.0 kW

6.Refrigerant -134a at 1.4 MPa abd 90°C is throttled to a pressure of 0.6 MPa. The temperature of the refrigerant after throttling is:

Select one:

a. 82 °C

b. 80 °C

c. 22 °C

d. 90 °C

e. 56 °C

7.Air is to be heated steadily by an 8 kW electric resistance heater as it flows through an insulated duct. If the air enters at 50°C at a rate of 2 kg/s, the exit temperature of air is:

Select one:

a. 46.0 °C

b. 54.0 °C

c. 50.0 °C

d. 55.4 °C

e. 58.0 °C

4. (30) Water (r = 1000 kg/m³ and µ = 1.12 x 10^-3 Pa-s) is siphoned through a 2mm diameter tube 1m long, with the tube exit 0.5m below the surface of the water. a) Write the governing equation

Simplify to get an equation in V only

Solve for V

Is the flow laminar or turbulent?

USING DYNACAM determine the polynomial equation for a single dwell cam to move a follower as follows

Dwell 0 deg to 100 deg

Rise .625 inches from 100 deg to 200 deg

Fall .625 inches from 200 deg to 360 deg

minimize velocity

DETERMINE THE NUMBER OF BOUNDARY CONDITIONS, THE CONSTANTS, AND THE POLYNOMIAL EQUATIONS FOR THE SVAJ DIAGRAMS

A centrifugal water pump is driven at a speed of 1450 rpm. The pump impeller is of radial type and has an average radius of 50 mm at the vane inlet and a radius of 150 mm at the vane exit. The vane width at inlet and exit are 25 and 10 mm respectively. The vane angles are ?₁ = 50⁰ and ?₂ = 30⁰. Assuming no prerotation at inlet and neglecting all sources of losses, determine

a. the volume flow rate

b. the output fluid power

c. the static pressure rise through the impeller.

Which type of corrosion cell causes iron or steel to corrode (and create rust) when a droplet of water is in contact with the surface? Question 10 options: a) Composition (dissimilar metals) cell b) Stress cell c) Concentration cell

1)please type do not write

. How do you test if a property is intensive or extensive? Using density and volume of a system as examples, explain whether these are extensive.

please type do not write

You are looking to start a business after you inherited a rolling setup, like the one from problem 2. You did a test run and measured P = 250kW, you will use this next. Also, you call you local power provider in Colorado and fin that the energy cost is 11.2 cents/kWh.

From a metal producer, you can buy 3/8” thick by 12” wide 6061 aluminum in 36 ft lengths. These are delivered to your warehouse at a cost of $1169 each.

You decide to buy the 38” sheet and roll it into 1/4” a sheet. You hire a shop worker to do this and he charges $35/hr. You also need to add $20/hr overhead.

You want to sell 4 feet long sheet and you shop worker needs 2mins to cut the rolled sheet into the 4 feet lengths and place then on a pallet for shipment.

Question: McMaster-Carr sells 1/4” x 12” x 48” sheets for $93.79, will you be able to sell yours for less? What is your cost per 1/4” plate? Show your work.

In an experiment the sample mean of a set of measurement is 10 mm and the sample standard deviation is 4 mm for a sample size of 36. Using sketch indicate where we can expect the location of population mean

3

a. Using energy storage in mechanical and electrical elements as a guide, if inductance L and mass m are analogous, what is the mass velocity ??? analogous to in the electrical circuit?

c. State the equations for the capacitance equivalent for “n” capacitors in series and for “n” capacitors in parallel.

d. What are the energy storage and power dissipative elements and their equations in an electrical circuit?