Refractories containing a substantial amount of silica which is reactive with

Refractories containing a substantial amount of

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26.Refractories containing a substantial amount of silica which is reactive with basic refractories, basic slags, or basic fluxes at high temperature are known as a)Acid refractoriesb)Basic refractoriesc)Natural refecatoriesd)None of the above 27.Refractories whose major constituent is lime, magnesia, or both and which may react chemically with acid refractories, acid slags or acid fluxes at a high temperature is known as 28.In API RP 936, the referenced ASTM standard procedure for cold crushing strength and modules of rupture is 29.The test specimen of castable refractory for cold crushing strength shall be
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30.The selected compression test section of specimen for CCs test shall be free from a) cracksb)chipped surfacesc)other obvious defects d)all of the above 31.All the samples for CCs test must be dried at 220 to 230˚C (105 to 110˚C) for 32.To compose a sample for CCS test from an equivalent number of refractory shapes the specimen should be 33.For modules of rupture test of brick and shapes, the preferred test specimen shall be standard 34.Modulus of rupture test for castable refractories, the test specimen shall be a)9 x 2 x 2 in (228 x 51 x 51mm)b)8 x 2 x 2 inc)6 x 2 x 2 ind)None of the above 35.To compose a sample for modulus of rupture test from an equivalent number of refractory shapes, the specimen should be
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36.As per ASTM C- 704, for the erosion tests, silicon carbide grit to be used by 37.Standard test method for abrasion resistance of refractory materials at room temperature is 38.A separation between adjoining parts of a refractory lining which allowssmall expansive movements, such as those caused by thermal changeis known as a)Thermal expansionb)Expansion jointc)Thermal conductivity d)None of the above
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  • Spring '18
  • Refractory, Refractory materials, FCCU

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