What you are to do is select a specific material (although the selection does not have to be approved by the Instructor, it cannot be generic [e.g., metal] but instead must be specific [e.g., 6061 aluminium metal alloy or PMMA polymer]). For the material chosen you will need to determine some material specifications, properties, attributes (availability, cost, fabricability, service life, colour, texture, etc.) that make this material unique and interesting to you. Also tell me about some of the applications for this material and why you think the material was chosen for those applications.

What is profitability Index? Given the discount rates and the future cash flows of each project, which project should they accept using Profitability Index?

Air enters the compressor of an air-standard Brayton cycle with a volumetric flow rate of 60 m³/s at 0.8 bar, 280 K. The compressor pressure ratio is 17.5, and the maximum cycle temperature is 1950 K. For the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%.


Determine:

(a) the net power developed, in kW.

(b) the rate of heat addition in the combustor, in kW.

(c) the percent thermal efficiency of the cycle.

Need some help with those questions. Thank you so much

Manufacturing Technology

1. The effects of cutting fluids on biological considerations and the environment.

2. Find out method in face milling and end milling operation.
(i) procedure
(ii) application

3. Summarize the centerless grinding, cylindral grinding, surface grinding in 4 line.

4. What are the difference on the operation between sensitive drill press and radial drilling machine

CASE STUDY A pilot was taxiing his air-force jet when the ejector seat fired, sending him upwards to then crash down onto the airfield, where he died from the impact injuries. Ejector seats are designed to enable a pilot to escape from a disabled aeroplane. When activated by the pilot (that is the normal way they work) a rocket pushes the seat and pilot out of the aircraft and at the top of the trajectory a parachute deploys to bring the pilot to the ground safely. This seat was not designed to enable a safe ejection at ground level, as the parachute would not have time to deploy before the seat hits the ground. Use the search term “RAF Ejector Seat” to discover a host of web sources for information on this tragic case i. Define the appropriate Event and draw, with the brief written explanation, a Mechanism analysis logic diagram. [25 marks] ii. Determine and explain your choice of the ‘questions’ which you would use to provide structure to the Outcome process and draw an Outcome Analysis diagram for the case based on those questions. [25 marks]

An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 900 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Taking into account the variation of specific heats with temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle

1. How does reliability helps in performance of maintenance function?

T OR F? Sgen is greater than zero for reversible process

COP of a refrigerator is higher than COP of a heat pump operating between the same two reservoirs

The efficiency an irreversible heat engine is always lower than the efficiency of a reversible engine operating between the same two reservoirs.

Explain clearly the differences in stacking arrangements of the three crystal models constructed. Use the planes of atoms to re-create the FCC and HCP crystal structure.

a. How can the face-centered cubic and hexagonal close-packed structure be converted

from one to the other?

b. Could this happen in “real life” --- if yes, explain how?

Consider the transfer of 10kJ of heat between thermal reservoirs at 500 and 400K. (a) Determine the magnitude, in kilojoules, and the direction of the availability transfer for two reservoirs. (b) Now, consider the transfer of 10 kJ of heat between thermal reservoirs at 280 and 250K. Determine the magnitude and direction of the availability transfers for these two reservoirs. (c) Compare the direction of heat transfer versus availability transfer for the two processes. The environmental temperature is 298K.

Why do the cast iron, carbon steel, and the tempered steel have different behavious about tensile stress-strain, and how would that be different?

I designed a substrate holder for a thermal evaporator for a lab I work in, based on the size of our chamber. It is height adjustable (rod stopping height from falling) with 2 or 3 mm tolerances.

The boat will be very close to tungsten boats as they are heating up. My question is...

what materials should I consider using for this design? And what temperatures can these materials go up to without oxidation occuring? What temperatures can they go up to without melting or significantly deforming?