Engineering, 23.03.2020 20:40 kevonmajor
Creating vacancies in ceramics. Consider doping ZrO2 with small concentrations of Nb205. The valence of Nb is 5. Assume that Nb ions sit in Zr ion sites. (a) What is the type of defects produced? (b) How will such doping affect the oxygen anion conduction in ZrO2?
Answers: 2
Engineering, 04.07.2019 18:10
Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way
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Engineering, 04.07.2019 18:20
Find the minimum film thickness for a journal bearing with the data below. shaft diameter, d-50 mm, clearance ratio, cdratio? 0.001, shaft speed, n 2000 rpm; bearing length. i 200 mm; eccentricity ration, ? -0.55. ( note, cdratio-ca/d) the minimum film thickness is um
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Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
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Engineering, 04.07.2019 18:20
For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.
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Creating vacancies in ceramics. Consider doping ZrO2 with small concentrations of Nb205. The valence...
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