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q why we need additives explainadditives are the materials added in small quantities to the moulding sand in order to enhance its exiting properties
q describe organic binders and its workingorganic binders the binders are most frequently used in core making cereal binders are obtained from wheat
q can you explain bentonite bindersits general composition is mgoal2o3sio2h2o it is formed by weathering of volcanic or igneous rocks it is a creamy
q describe fire clay and kaolinite bindersfire clay fire clay is refractory clay usually found in the coal measureskaolinite its general composition
explain some points regarding to hardness1 hardness removal using lime and soda is based on the solubility reactions of calcium carbonate caco3 and
q what do you understand by bindersbinders used in a foundry are inorganic and organic binders organic binders used for core making and will be
non-carbonate hardness nch - water softening1 permanent hardness not removed by heating water2 ca2 mg2 combining with ions outside of alkalinity such
q how can you implement chemically coated sandchemically coated sand clean silica grains are sometimes coated with a non thermosetting hydrocarbon
q describe natural and synthetic sandnatural sand a natural sand is the on which is available from natural deposits only assistive and water need to
carbonate hardness ch - water softeningca2 mg2 combining with alkalinity oh- co3-2 hco3- if alkalinity is present in water the ch will
q explain sand and moulding sandssand according to the amount of clayey matter they contain the moulding sands are classified asbull silica sand
q what do you mean by moulding materialsvarious types of materials are used in the foundries for the manufacture of casting moulds and cores these
q define pattern colour codethe patterns are normally painted with contrasting colours such that the mould maker would be able to understand the
q can you explain corners and fillets corners and filletsthe intersection of the surfaces in casting must be smooth and forms no sharp angles for
q define pattern draft or taperit is also termed as draw it is the taper placed on the pattern surface that are parallel to the direction in which
explain hardness - water softening1 hardness is used to characterize a water that does not lather well causes a scum in the bath tub and leaves hard
q explain machining allowancemachining allowance or finish allowance indicates how much larger the rough casting should be over the finished casting
q how can we use of shrinkage allowancesince metal shrinks on solidification and contracts further on cooling to room temperature linear dimensions
q can you explain pattern allowancesthe difference in the dimensions of the casting and the patterns is due to the various allowances considered
design a 10 unit rapid sand filter system for a flow of 63 mgd with a filtration rate of 2 gpmsq ft and an l w ratio of 13 design flow q 63 mgd
calculate the surface dimensions of sedimentation tanka treatment plant upgrade calls for design of sedimentation basins to handle a flow rate of 8
explain the design criteria sedimentation basinsurface loading rate or overflow rate vo qa flow ratesurface areadetention time t or vq volume flow
define the types of sedimentation1 type i particles that settle discretely settle as individual particles sand grit pre-sedimentation for sand
explain sedimentation1 sedimentation basin or clarifier is used to remove particles that will settle in a reasonable time period2 basins are usually
explain flocculation most important factor effecting particle removal efficiency objective - to bring particles into contact so that they will