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Thermal spelling: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelling can be decreased by minimizing the development of internal stress by:
(1) Using refractory with high porosity, good thermal conductivity and low coefficient of expansion.
(2) Avoiding sudden temperature changes.
(3) Proper furnace design
Heat capacity: Heat capacity of furnace depend on (1) Thermal conductivity (2) Specific heat and (3) Specific gravity of refractory. The dense and heavy fire clay
Mask Alignment and Exposure One of the most significant steps in the photolithography process is mask alignment. A mask or "photomask" is a square glass plate with a patterned
Brazing and Soldering - Both soldering and brazing processes are useful for combination two dissimilar metals. Both brazing alloy and solder have lower melting points than the met
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Figure P9.9 shows three reactors linked by pipes. As indicated, the rate of transfer of chemicals through each pipe is equal to a flow rate (Q, with units of cubic meters per secon
bernaulli''s theorm related numericals
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CLASSIFICATION OF CHEMICALS IN THE STORE Your Counsellor will give you names of any five chemicals. You fill up the report in tabular form (Table) indicating the name of the ch
What are its applications? (i) Direct extrusion: The billet is placed in a container and forced by the die through a piston. (ii) Indirect extrusion: The extruded part
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