Q1

In the aerospace industry, the material cost is small in relation to the total fabricated cost of the material. If we assume approximately 10% of the total value of a pound saved on a sattelite may be spent on raw material, how much can we spend (in dollars per pound) on raw material?

Q2

Using the result of the previous question, which of the following materials can be justified for use in fabrication of a sattelite if a large majority of the sattelite will comprise the material selected?

nickel-based superalloys

silver

palladium

gold

high-strength composites

Q3

Based on the analysis of this section, at most approximately $.20/lb can go toward raw material cost in the fabrication of rail and ship transit carriers. What is the most expensive material that is feasible in the fabrication of the structural components in this sector?

wood

concrete

carbon steel

plastic

PLEASE I NEED CORRECT  ANSWER

Explain how the load conditions related to shear diagram, and how shear conditions related to moment diagram.

You are considering two columns with identical dimensions. One is constructed out of steel, the other aluminium, which will buckle at a smaller load? The euler formula for critical buckling force for column, pin jointed at both ends is given by Pcr = pi^2 EI/ L^2 if the end of the column are constrained to prevent rotation, how will the buckling force change?

Q2 The pump of a LiBr--water absorption refrigeration system delivers (0.7 kg/s) of
solution. The absorption system operates at the following temperatures: generator (I 10 'C);
condenser (40 'C); evaporator (lO 'C); and absorber (33 'C). Calculate;
(a) The refrigerant mass flow rate, the refrigerating capacity, and the COP of the system.
(b) The COP of an ideal heat-operated refrigeration system that operates with the same
temperatures.

We will find the Moment of Inertia Moment and Polar Moment of Inertia of a U profile that will determine its dimensions by ourselves.

Excellent combinations of hardness, strength, and toughness are obtained from
tempered martensite. An employee in a heat treatment facility austenitized an eutectoid
steel at 9500C for 45 min and finally allowed the steel to slowly cooled in furnace. Do
you think the required tempered martensite structure was produced? If not, support
your answer with a detail heat treatment that can be employed for the steel.

Water enters the condenser of surface type; the temperatures of the water that is used to cool the steam is 17oC and 28oC respectively. The pressure of the condenser is at 0.055 bar and 0.87 dry fraction. The overall heat transfer coefficient in the condenser is 3 kW/m2.oC. The condenser has three passes and tubes used have 17.6 mm internal diameter and 20 mm external diameter. If the flow area is 1.3 m2, Design the condenser. If the condenser is used to condense 240 tons of steam per hour.

1. You are preparing a spaghetti dinner for guests when you realize that your heat transfer training can be used to answer some fundamental questions about the process. The pot you are using holds four liters of water. The atmospheric pressure is 101 kPa. When on its high setting, the electric stove heating unit consumes 1.8 kW of electrical power of which 20% is transferred to the surroundings, rather than to the water. The pot is made of 4 mm thick polished AISI 304 stainless steel and it has a diameter of 0.25 m. The burner diameter is also 0.25 m.

a.) How much time is required to heat the water from 15 ^◦C to its boiling temperature?

b.) What are the temperatures of the outside and inside surfaces of the bottom of pot while the water is boiling?

Materials Engineering

a) Compare planar densities in terms of atoms per area in terms of a, the lattice parameter for the (100), (110), and (111) planes for FCC. Which is the closest packed (densest) plane or FCC?

b) Compare planar densities in terms of atoms per area for the (100), (110), and (111) planes for BCC. Which is the closest packed (densest) plane for BCC?

The output shaft of a 120 Watt electric motor has a 20° full-depth steel spur pinion with 20 teeth and a module of 2.5 mm driving a 36-tooth gear attached to an air blower. The pinion speed is 100 rpm. Both the pinion and gear are manufactured from grade 2 steel using hobs shaping cutters, have a 18mm wide face, through-hardened steel at 200 Brinell, and are aligned in service such that kH = 1.6. For a service life of 108 cycles, a reliability of 99%, determine the bending fatigue stress and the associated factor of safety