In a tensile test of an aluminum rod it has a calibrated length of 50.8 mm and a diameter of
12.74 mm. A load of 3 180 kg and an elongation at the elastic limit of 0.0175 cm was recorded. The distance in the areacalibrated after the break is 5.65 cm and the final diameter in the section of the fracture was 1.05 cm. In a tensile test of an aluminum rod it has a calibrated length of 50.8 mm and a diameter of 12.74 mm. A load of 3 180 kg and an elongation at the elastic limit of 0.0175 cm was recorded. The distance in the area calibrated after the break is 5.65 cm and the final diameter in the section of the fracture was 1.05 cm. determine :

a) the effort in the elastic limit; b) The elastic modulus of the material; c) The ductility of the material ie the deformation unit and the reduction of total area until the test tube ruptures; d) The final length of a bar of this material 250 cm when applying an effort of 200 MPa.

A 20ft x 20ft metal building has a steel roof that reaches a temperature of 140^o F on a hot day. A cool front then moves in such that air at 60^oF sweeps horizontally across the roof at a velocity of 10 ft/s. Assuming the roof temperature remains at a constant 140^oF for a time, determine:

a) the point at which the flow becomes turbulent (in feet)

b) the average heat transfer coefficient for the roof (in BTU/hr*ft^2*F)

An industrial process is using river water to cool 10⁵ kg/h of saturated steam in a heat exchanger at 0.1 bar. The cooled steam exits the heat exchanger as a saturated liquid at the same pressure of 0.1 bar to be used in the process. The river water has a volumetric flow rate of 500 ft³/s and is the coolant in the heat exchanger., having properties close to pure water (i.e., density – 1000 kg/m³). It exists the heat exchanger with the same mass flow rate, and is returned to the river, but at a higher temperature. The river water on a hot summer day is 20 ⁰C at the heat exchanger inlet, and near the mixing point of the discharged water from the heat exchanger. Operation is at steady state and kinetic and potential energy can be neglected. Since a higher river temperature results in lower dissolved oxygen there may be a risk of killing fish or even “stressing” them. For example, rainbow trout stop growing at sustained river temperatures of 73°F (23° C), and die at about 80 ⁰F (27 ⁰C). Should the owner of this industrial process be concerned for the fishes and local fisherman’s livelihood? Please comment by calculating the temperature rise of the river at the heat exchanger’s exit that discharges into the river.

Hint: properties of the saturated and compressed water can be found in tables: Table A-3 and Table A-5.

Determine the required size (area, nominal diameter, and Bar No.) of the three reinforcing steel bars used in a 9 in. wide and 12 in. deep concrete beam to assure the beam fails in compression of the concrete and the steel reinforcement reaches its yield strength at the same load. Assume that the ultimate compressive strength of the concrete is 4,000 psi and the yield strength of the steel is 30,000 psi.

Consider a single crystal of a cubic metal that is subjected to a tensile stress along the [0 1 2 ] direction.

Calculate the Schmidt factor for the following slip systems. In each case sketch the tensile axis as well as the slip plane and slip direction.

a) (0 -1 1) [0 1 1]

b) (1 0 1) [-1 -1 1]

c) (0 1 0) [ -1 0 1 ]

d) If the crystal above is subjected to an increasing applied stress, which of the systems above will undergo slip first. Explain your answer.

e) What is the value of the ratio t _CRSS / (sigma)_y at the point of slipping?

1.What is working progress for Design for cost? 2.What is working progress for Design to cost?

1. What is Work process of Design for cost(DFC)? 2.What is checklist for DFC? 3. How can we do Design for cost analysez? 4. What is work process of Design to cost(DTC)? 5.What is Checklist for DTC( If it has)?

Water at 20°C flows up a vertical pipe of circular section and internal diameter of 2 inches and height of 12 metres at a volumetric flow rate of 6.7 litres per second. Estimate the change in pressure between the bottom and the top of the pipe if:

i. The inner walls of the pipe are assumed to be hydraulically smooth,

ii. The pipe is fabricated from cast iron and explain how you solved (ii) above.

What is the aluminum profile? What is the manufacturing method of aluminum profile? What are the materials used in the manufacture of the product, describe in detail. What are the stages of the production method?
What are the faults that can be caused by the production in the product? Are there any alternative production method? What are those, compare them.
What are the standards to follow in the production method?

A plane wall has thickness of 5 cm, thermal conductivity of 2 W/mK and generates heat. The left face of the wall (x=0) has a surface temp. of 80C and has air at 20C flowing past it with a heat transfer coefficient of 50 W/m^2K. If the right face is insulated then the temperature distribution through the wall has a general format T(x)=A+B*x+C*x^2

(a) Draw a properly labeled diagram (including a representative temperature distribution), state all assumptions and calculate the volumetric energy generation in the wall.

(b) Apply appropriate boundary conditions to determine the coefficients A, B, and C for the temperature distribution through the wall.

(c) Where will the maximum temperature be located in the wall?

Determine the displacement of a plate of length L pinned at its ends with a concentrated load Va applied at the center.

1. What is the USA principle?

2. Why is the USA principle important?

3. Why is the automation migration strategy not suitable for products with short lives?

A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.08 and 0.10 m, respectively. The annular space between the tubes is completely enclosed and filled with air at atmospheric pressure. Under operating conditions for which the inner and outer tube surface temperatures are 80 and 30°C, respectively, what is the rate of convective heat loss per meter of tube length across the air space?

1. If the oxygen diffusion coefficient in tissue is assumed to be 1.1x10-5 cm2/s and fluid velocity is 1 mm/s, how large a distance between capillaries is required for convection to play an equally significant role as diffusion? Assuming an average distance between capillaries of 100 mm, does convection play a significant role? Use Peclet number to justify answers.