what alloying elements affect the machinability of steel alloys?

what are advantages and disadvantages of welding over other joining processes?

Find at least one example of each of these three promotional tools in the current press, Internet, TV, or other media source: advertising, public relations (PR), and personal selling. For each promotional tool example you found, describe how the companies are using the tools, and what the tools are meant to accomplish. Are promotional tools successful in delivering the company’s message?

An Otto Cycle has air operating as the working fluid. The air begins the compression process at 90 kPa and 40oC. During the heat addition process, the maximum temperature of the air (T3) is 2000oC. The compression ratio of the cycle is 9.2. Treating this as a “Hot Air Standard Cycle”, determine the temperature and pressure at the end of each process, the net work per kg of air produced in the cycle, the thermal efficiency of the cycle, and the mean effective pressure.

Consider a 9 mm diameter circular tube, calculate the length of tube that is required to transfer 100 W of
water that circulates through the tube at a rate of 0.08 kg / s.
The temperature of the water is kept constant at 50 ° C and the wall
of the tube is maintained at 45 ° C.

Explain, using your own words, how a solar cell works. Please include the description of all relevant physical processes, such as charge carrier generation, recombination, and collection. Include a descriptionof carrier concentration upon illumination.

Length should be 1 page ,12 font, single spaced.

An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compressor process is 100 kpa and 27 C. The maximum temperature in the cycle is 2200 K and the cutoff ratio is 1.2

Determine the following:

The internal energies at the beginning and the end of the compression

The enthalpy before and end of the combustion

The internal energy before and end of the expansion

The heat input, heat rejection and network output

The thermal efficiency

Sketch two graphs showing how the specific thrust and thrust-specific fuel consumption (TSFC) of an ideal hydrogen-burning ramjet varies with flight Mach number from static conditions up to Mach 7 and state why the specific thrust falls to zero when the Mach number approaches 7.

Please show working out and describe what is done

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)