Write the simplified conservation of momentum equation for boundary layer on a flat plate and explain the physical meaning of each term in the equation.

Transformation from α-Sn to β-Sn and from β-Sn to α-Sn is exactly the same in terms of the kinetics of the phase transformations.

in heating ventilation and air conditioning (HVAC) explain what operation is carried out to achieve comfort during summer and in winter

Write a small assessment no more than 2 pages including mention above: Alternatives and improvements to refrigerators and freezers in Cape York Community.

Remote Indigenous communities rely on refrigeration and freezers to store large amounts of food over time, ensuring traditional hunting practices can be maintained and people can come and go from Country as needed. This project looks at mechanisms for freezing and storing food beyond the generic available appliances which are dependent on connection to a large, pre-existing solar power supply.

Include the following aspect in this report: write a professional and concise document which draws on appropriate background information. An assignment is well written, contains appropriate references and draws on suitable background information. consider the context of the engineering work including social, cultural, environmental and commercial factors. All required factors are considered with sufficient detail and analysis relevant to the proposed project. And there is evidence that standard engineering principles and practices have been applied to the development of the assignment. The document contains all required elements outlined in the task description including introduction, project objective and possible design criteria.

a)Write brief notes on how much air pressure is required to start any marine diesel main engine; how many times should the air reservoir be able to start. The conditions must be clearly stated.

b) What are the main causes of over pressurizing an air reservoir and what are the safety measures put in place?

c) What are the possible causes of an air compressor running for long periods to fill air reservoir
on time?

ROUND UP TO 4 DECIMAL PLACES. Draw and label the P-V & T-S diagrams.

A gas turbine power plant operates on simple Brayton cycle with air as the working fluid. The pressure ratio is 12. Temperature at the compressor inlet is 300 K, while at the turbine inlet the temperature is 1000 K. Determine (a) the efficiency and (b) the net work output per kg of air. (c) Mass flow rate (kg/s) to produce 70,000 kW.

Q3. [15 marks] A solid steel shaft (E = 210 GPa, ? = 0.33) of radius 20 mm has been forced into an aluminium gear (E = 70 GPa, ? = 0.33) of outer radius 40 mm and thickness of 10 mm. There is a radial interference of ? = 0.02 mm. a) Determine the contact (interface) pressure, pc ; [6 marks] b) Sketch the radial stress distribution in the shaft and the gear; [5 marks] c) If the coefficient of friction between the shaft and gear is μ = 0.1, what axial force would be required to move the gear along the shaft? [2 marks] d) What is the maximum torque, which can be transmitted through the shaft? [2 marks] If you cannot solve a) and b) for c) and d) assume pc = 100 MPa.

Issue # 2 - A V-belt from a 10 in. Diameter spindle pulley that rotates at 1800 rpm, to a 36 in. Diameter flat pulley. The wheelbase is 40 "and the throat angle is 40o. The friction coefficient between the belt and the grooved pulley is 0.2 and with the flat pulley it is also 0.2. The cross section of the straps is a trapezoid with parallel sides of 1.5 "and 0.75", with a height between them of 1 ". The weight of this belt is 0.04 lbf / in3, and the maximum allowable tension on each belt is 200 lbf. Determine: a) How many straps are needed. b) The Torque applied in the transmission, c) The Transmitted power. Note: Consider locating the center of gravity of the belt cross section in order to correct the actual pulley diameter as the band on the splined pulley is slightly outward.)

Describe the principle of operation of both the positive displacement and roto-
dynamic pumps.

b) List three (3) characteristics each of the above pumps .

c) Sketch a gear pump and label it.

You are required to design and fabricate a composite material to be used for machining hard steels. Use the information presented in your lecture notes and:

i) Identify the type of a composite that you would like to design, then select the appropriate reinforcement and matrix and fully justify your selection.

ii) Select a fabrication route for the designed composite and justify your fabrication process selection with respect to temperature and time