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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
Which one of the following statements is correct? You may wish to examine a molecular model of this compound. 1. Carbon D is an asymmetric center and its configuration is R 2
A gas stream containing solute A at mole fraction of 0.02 is to be cleaned by absorbing 90% of the solute into a liquid stream in a countercurrent packed bed gas-liquid absorber. T
Explain Ferromagnetic materials Ferromagnetic materials are those with spontaneous magnetic alignment. Ferromagnetism is the property of a material to be powerfully attracted
What is piezoelectricity? Piezoelectricity: Piezoelectricity gives us a means of changing electrical energy to suppose new geometric positions and the mechanical dimensions of
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
Ammonia is oxidized with air to form nitric oxide in the first step to produce nitric acid. The reaction occurs in a well insulated continuous reactor based on the stoichiometry:
Mass transfer coefficients can be of either local or overall type. a. Describe carefully what the local and overall mass move coefficients show. b. How does the concentration
USES Sensors and devices based on Hall Effect are used for: 1 Analog multiplication 2 Current sensing 3 Position and motion sensing 4 Automotive ignition and fuel in
What is meant by crystal imperfections? Crystalline solids have a very regular atomic structure: that is, the local positions of atoms with respect to each other are frequent a
The over all diffinition of stripping
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