An object of irregular shape has a characteristic length of L = 1 m and is maintained at a uniform surface temperature of T_s = 325 K. It is suspended in an airstream that is at atmospheric pressure (p = 1 atm) and has a velocity of V = 100 m/s and a temperature of T_? = 275 K. The average heat flux from the surface to the air is 12,000 W/m². Referring to the foregoing situation as case 1, consider the following cases and determine whether conditions are analogous to those of case 1. Each case involves an object of the same shape, which is suspended in an airstream in the same manner. Where analogous behavior does exist, determine the corresponding value of the average heat or mass transfer convection coefficient, as appropriate.

(a) The values of T_s, T_?, and p remain the same, but L = 2 m and V = 50 m/s.

(b) The values of T_s and T_? remain the same, but L = 2 m, V = 50 m/s, and p = 0.2 atm.

(c) The surface is coated with a liquid film that evaporates into the air. The entire system is at 300 K, and the diffusion coefficient for the air–vapor mixture is D_AB = 1.12 × 10^?4 m²/s. Also, L = 2 m, V = 50 m/s, and p = 1 atm.

(d) The surface is coated with another liquid film for which D_AB = 1.12 × 10^?4 m²/s, and the system is at 300 K. In this case L = 2 m, V = 250 m/s, and p = 0.2 atm.

Explain unconventional machining process?

b) why it applicable to small machining operations.

Determine L10 (hours) for the given system below:

Type of bearings: Angular-Contact Ball Bearings

Series: 02-55 (Bore = 55 mm)

Which ring rotates? Inner ring

n_D (revs/min) = 320

af (application factor) = 1.2

R = 92%

Fr (radial, kN) = 4

Fa (axial, kN) = 4

Explain the effect doping towards an intrinsic silicon. Give one example of donor element and one example of acceptor element. (15marks)

Please help answer by typing using computer. please help .please make sure answer given is 100% correct. tq

A rigid body of any given shape rotates freely under zero torque. Show by using Euler’s equations
that the rotational kinetic energy and the magnitude of the angular momentum are
constant.

12-5. An air-cycle unit operating on the simple system is designed for the following  
conditions: 15 lb/min of conditioned air, air entering the turbine at 60 psia, cabin
pressure 14 psia, dry-air rated discharge temperature 20 F, and a turbine efficiency of 80 per
cent.
a. At what temperature does air enter the turbine?
b. How much power does the turbine supply to the fan?

Very briefly, give a short no more than one-page (per subject) tutorial (i.e., introduction and problem statement, state-of-the-art, and recent advances) on NO MORE THAN 3 (any three) of the following topics.

Topics:

i) Bio-inspired Mechatronic Systems

ii) Mechatronic Systems for Rehabilitation

iii) Micro and Nano Mechatronic Systems

iv) Mechatronic Systems for Energy Harvesting, Transfer and Storage

v) Social Mechatronic Systems

vi) Mechatronic Systems for Advanced Manufacturing

derive equation of thermal energy balance for fin? also draw figures applicable

Provide a description of the following micro-sensors/actuators fabrication processes:

1.) photolithography

2.) oxidation

3.) chemical vapor deposition

4.) chemical and plasma etching

5.) bulk micromanufacturing

6.) surface micromanufacturing

7.) LIGA process

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