Mechanical wearing away of the surfaces of refractory bodies in service by

Mechanical wearing away of the surfaces of refractory

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39.Mechanical wearing away of the surfaces of refractory bodies in service by washing action of moving liquid or gases is called a)erosion of refractoriesb)spalling of refractoriesc)crumble of refractoriesd)none of the above 40.The air pressure to blast the 1000 g of size graded silicon carbide grainfor abrasion resistance test should be 41.The property of matter by virtue of which heat energy is transmitted through particles in contact.
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42.The increase in linear dimensions and volume which occurs when materials are heated and which is counter balanced by contraction of equal amount when the materials are cooled. 43.The exposure of a material or body to a rapid change in temperature which may have deleterious effect a)thermal expansionb)thermal conductivityc)thermal shockd)none of the above 44.Refractory failure mechanism are. 45.An internal component used for the separation of solids from flue or product gas in a fluid coking unit is called 46.Enclosure inside the top head of a reactor or regenerator vessel which supports the cyclones and in which gases exiting the cyclone outlets are collected is called 47.Section of transfer line in which flow is in an upward direction is called a)cyclone of FCCUb)Plenum of FCCUc)Riser of FCCUd)None of the above
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48.Metallic anchor made from rod or bar stock that is configured in a V-shape is called 49.Metallic anchor, usually V-stud which has a foot shaped configuration at the base to aid weld attachment to the shell is called. 50.Welding method utilizing an arc-welding machine in conjunction with a timer and a gun is called 51.Metallic anchor made from rod or bar and usually used for dual layer linings that is configured in a)Y shapeb)V shapec)U shaped)All of the above
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  • Spring '18
  • Refractory, Refractory materials, FCCU

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