What is an additive manufacturing (AM) or additive layer manufacturing (ALM) process?

10. What is the difference between traditional ceramics and new ceramics? (2')

3. What are the two basic categories of cutting tools in machining? Give an example of machining operations that use each tooling type. (2')

3. What would be the closest size estimation of a Helium atom? А. 1 mm В. 1 um С. 1 nm P. 1Å Е. 1 pm

Problem 2: How much faster can you cook a potato in a convection oven versus a standard oven? Assume that the potato can be approximated as a cylinder with a diameter of 3 cm and length of 4 cm, with density p=950 kg/m^3, thermal conductivity k=0.8 W/m*K, and specific heat Cp=4.6 kJ/kg*K. The air temperature in both ovens is 190°C. and the potato starts at 20°C. (a) Assuming a convection coefficient of h=8 W/m^2*K in a standard oven, is it appropriate to use a lumped capacitance approach? Calculate the time required to heat the potato to a temperature of 140°C. (b) Assuming h=15 W/m^2*K in a convection oven, is the same approach still appropriate? Calculate the time required to heat to the same temperature.

1. What are the two major groups of metals? Define them. (2')

1.4What is the difference between a consumer good and a capital good? Give some examples in each category.

(a) Describe and draw the Fe-C diagram, give the approximate composition and temperature for the eutectic, eutectoid and peritectic transformation. Identify the phase fields and the associated crystal structure. Give the customary name for each phase. (b) What are the advantages of directional solidification and how is it performed? Describe how single crystal components are manufactured. (c) A casting of very intricate shape and good surface finish is to be cast. Suggest some suitable methods if the casting is (i) solid and if it is (ii) hollow with a cavity of complex shape.

9. What is the difference in melting characteristics between a pure metal element and a metal alloy?(2')

Stereolithography is to be used to build a part as shown in the figure. Dimensions are; height= 23mm, outside diameter = 75 mm, inside diameter = 65 mm, handle diameter = 6 mm and handle distance from the cup = 70 mm (center to center). The handlebar has a cross-section of 5 x 6 mm?!The thickness at the base of the cup is 6 mm. The laser beam diameter is 0.25 mm with a speed of321 mm/s. Layer thickness = 0.20 mm. Estimate the time required to build the part if 10 s are lost from layer to layer preparation.