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Two parallel planes 1.2x1.2 are splited by a distance of 1.2 m. the emissivity's of the planes are 0.4 and 0.6, and the temperature are 760 and 300 oC, correspondingly. A 1.2x1.2 radiation shield having an emissivity of 0.05 on both side situated equidistance among the two planes. The combined arrangement is placed in a large room which is maintained at 40 oC. (a) Determine heat transfer rate from each of the two planes if the shield were not present. (b) Determine heat transfer rate from each of the two planes if the shield were present. (c) Temperature of the shield.
Proximity Printing The proximity exposure method is same to contact printing except that a small gap, 10 to 25 microns wide, is maintained among the wafer and the mask during e
1. a) How are Polymers classified? b) Define polymerization. Differentiate addition and condensation polymerization. 2. a) Explain the free radical mechanism of addition p
Applications: Piezoelectric materials serve as a source of ultrasonic waves. At sea, they might be used to calculate depth, distance of shore, position of icebergs, submarines. Th
Process Description For Production of Chemicals from Coal Before it can be fed to the gasification reactor, coal must be ground to meet specifications on particle size. The gr
Refractoriness: It indicates the capacity of a material to withstand heat without appreciable deformation or softening under particular operating conditions and is measured as the
What are the objectives of heat treatment processes? The heat treatment is generally adopted for the following: (i) To refine grain structure (ii) For better machinabili
Requirements of boiler feed water
Bulk defects * Voids are little regions where there are no atoms, and can be thought of as clusters of vacancies. * Impurities can cluster jointly to form small regions of a
0.66 GRAM OF HYDROCARBON ON COMPLETE COMBUSTION WITH OXYGEN GAVE 1.32 GRAM OF CO2 &2.2.7 GRAM OF H20
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