Millwrights in a factory need to suspend a machine weighting 10500ib from a beam
having a span of 12.0 ft so that a truck can back under it. Assume that the beam is simply
supported as its ends. The load is applied by the cables , each 3.0ft from a support . Design
a suitable beam. Consider standard wooden or steel beams or 1 of your own design.

Discuss the requirements for each of the following components and discuss which of the processes you would choose to make the product. Please provide references where possible.

1. Screwdriver.

An example is shown below:

Example: An ashtray

Select all materials possible in making ashtray e.g. stainless steel and explain the properties of stainless steel. Hence choose the best material based on production purposes.

Explain briefly all the process involved (e.g. casting, forging, etc) in making the product for the selected materials. Explain in detail the best process that your group had chosen for making of the product. (Eg: Molding, include diagram.)

Conclusion to why your group had chosen the materials and process for every item above.

Overall conclusion to the above case study e.g teamwork, what you had gained from the case study, etc.

Discuss the requirements for each of the following components and discuss which of the processes you would choose to make the product. Please provide references where possible.

1. Bicycle Gears.

An example is shown below:

Example: An ashtray

Select all materials possible in making ashtray e.g. stainless steel and explain the properties of stainless steel. Hence choose the best material based on production purposes.

Explain briefly all the process involved (e.g. casting, forging, etc) in making the product for the selected materials. Explain in detail the best process that your group had chosen for making of the product. (Eg: Molding, include diagram.)

Conclusion to why your group had chosen the materials and process for every item above.

Overall conclusion to the above case study e.g teamwork, what you had gained from the case study, etc.

Water at a flow rate of 20,000 kg/h will be heated from 20°C to 35°C by hot water at 140°C. A 15°C hot water temperature drop is allowed. A number of 3.5 m hairpins of 3 in. (ID = 0.0779 m) by 2 in. (ID = 0.0525 m, OD = 0.0603 m) counter flow double-pipe heat exchangers with annuli and pipes, each connected in series, will be used. Hot water flows through the inner tube. Fouling factors are: Rf i = 0.000176 m² ? K/W, Rfo = 0.000352 m² ? K/W. Assume that the pipe is made of carbon steel (k = 54 W/m ? K). The heat exchanger is insulated against heat losses. Assume that the allowable pressure drop in the annulus is 10 kPa. The velocity of cold water through the annulus will be around 3 m/s, which would require a large pressure drop to drive the cold fluid through the inner tube. The pressure drop could be reduced by using several units with cold water flowing in four parallel units and hot water flowing through the inner tube in series. Calculate: a. The overall heat transfer coefficient b. Pressure drop in the annulus c. The appropriate mean temperature difference.

9(a). How can a Zigbee based WSN avoid interferences from another Zigbee based sensor network in the same region?

(b). How the power in expressed in decibel, and what are the approximate power levels of (i) FM; (ii) Microwave Oven; (iii) Blue tooth; (iv) Wireless network.

3(a) What is the operating frequency of Zigbee and what is the wavelength?

(b). Explain the data format for the Zigbee protocol.

Consider the parallel planes of infinite extent normal to the page having opposite edges. The planes are in the environment of T_env = 300 K as shown

Using the appropriate view factor relations and the result for the opposing parallel planes, develop an expression for the view factor, F_1?2

Using the cross-string technique to determine the view factor, F_1?2

Calculate temperature T_l

Q) List down the factors that should be considered while designing a factory building? Will you prefer "L" shaped building over rectangular building for new plant? Why?

Definition of Work, Energy,Power, and Torque

In Gasoline Engine

1. an undulated surface that is designed to reduce friction by eliminating wear particles from the sliding interface. The interface is subjected to normal force N. The sliding speed is so low that the interfacial temperature rise is negligible relative to the melting point of the material. We are planning to use metals for the sliders.

a. Determine the optimum dimensions of the undulated topography.

b. Discuss the consequence of deviating from the optimum geometry.

2. A conical asperity is plowing the surface. Determine the coefficient of friction.

3.At the beginning of sliding, there are 10,000 particles of 1 micron in diameter between two flat Armco iron surfaces. The hardness of Armco iron is 1000MPa. After one day of sliding, the particles have agglomerated into 100 equal sized spheres. What would be the change in friction coefficient? Plowing is primarily responsible for friction. State your assumptions clearly.At the beginning of sliding, there are 10,000 particles of 1 micron in diameter between two flat Armco iron surfaces. The hardness of Armco iron is 1000MPa. After one day of sliding, the particles have agglomerated into 100 equal sized spheres. What would be the change in friction coefficient? Plowing is primarily responsible for friction. State your assumptions clearly.

4. A composite bearing material has been developed using uniaxial graphite fibers embedded in a polyurethane matrix. The fibers are perpendicular to the sliding surface. Estimate the coefficient of friction and wear rate of the composite when it is sliding against a 52100 steel sphere of 0.02 m in diameter. State your assumptions

5. You have developed a new copper alloy that has titanium diboride (TiB2) as second phase particles. The total volume fraction of TIB2 is 3 %. The particle size is uniform throughout the matrix of copper. You made five samples by varying particle size as follows: 0.05 microns, 0.1 microns, 1 microns, 10 microns, and 100 microns.

(a) Estimate the hardness of each material.

(b) Estimate the wear coefficient of each sample, assuming that they wear by delamination.

State your assumptions clearly

Air flows through a 8-in-diameter, 60-ft-long adiabatic duct with inlet conditions of V1= 550 ft/s, T01= 650 R, and P1= 50 psia. For an average friction factor of 0.03, determine the velocity, temperature, and pressure at the exit of the duct. Please DO NOT merely copy other expert's work. I would like original work.

a) An open cycle gas turbine engine consists of a compressor, a combustion chamber and a two-stage turbine with a re-heater. The gas enters the compressor at a temperature of 15 C. The pressure ratio of the compressor, which is 90% efficient, is 12. The combustion gas enters the first stage turbine at 1100 C. Both stages of the turbine are 95% efficient. The first stage has a pressure ratio of 4, whereas that of the second stage is 3. The re-heater heats the gas to 1050 C. Assume that the specific heat at constant pressure is equal to 1.005kJ/kgK during compression, and equal to 1.130kJ/kgK during combustion and expansion.

i. Draw the T – s diagram for the cycle marking all necessary state points and given data.

ii.Evaluate the cycle efficiency.

iii. The required power output of the engine is 100kW. Calculate the required mass flow rate of gas.

(b) A heat exchanger is now added to the system in (a). The heat exchanger allows 80% of the maximum possible heat to be transferred.

i. Draw the complete plant for this system, marking the necessary state points and the flow of gas through the system.

ii. Re-evaluate the cycle efficiency, and mass flow rate.

a. Explain the operation of thermodynamic systems i.e. open system and closed system with the aid of diagrams and examples.

b. Define the term 'property of a substance' in a thermodynamic system and state the main difference between intensive and extensive properties with examples.

Evaluate the polytropic process parameters by

a. writing out the relationship between pressure and volume

b. deriving the expression for work flow

c. relating polytropic index 'n' with different types of processes in the form of graph