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casting means the pouring of molten metal into a mould where solidification occursadvantages of casting process i it
a riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the
a gating system is usually made up of i pouring
design of casting the important factors to keep in mind when designing a casting to obtain maximum strength and minimum casting includes
shell-mould casting is variant of the resin bonded sand technique for casting steel iron or non-ferrous alloysthe mould is made by a mixture of fine
sand castings are porous enough and therefore cannot be used for pressure sight vessels structure obtained by sand casting is loose and hence not
allowances for pattern a pattern is always made larger than the required size of the casting in order to allow for various factor such as shrinkage
types of patterns these depends upon many factors like the bulk of casting type of moulding processes number of castings required and the
pattern practices a pattern may be defined as a replica or fascimile model of the desired casting which when packed or embedded in a appropriate
survey of manufacturing a usable product is manufactured in the following sequenceore from earth rarr reducing processes rarr molten metal rarr
economic definition manufacturing increase the value of producttechnological definition manufacturing is a process which gives required
q explain the grain growthans grain growth after recrystallization is complete the strain free grains will continue to grow if the metal specimen is
q what is slip what is slip plane what are principal if slip planes and slip direction for bcc fcc and hcp crystalans x-ray diffraction studies show
q explain various stages of creepans creep creep can be defined as the process by which plastic flow occurs when a constant stress or load is applied
q discuss the role of precipitate particles strengthening crystalline materials against yield as low as well as high temperature of deformationans
q describe the four main methods of strengthen crystalline materials against plastic yieldans 1 work hardening strain hardening or work hardening is
q explain the mechanism for dislocation in plastic deformationans stresses are acting on dislocation in a crystal that is known as stress field
q explain the following with reference to deformation of
q what is recovery and recrystallizationans due to the cold working of metals there arise a large number of dislocations and distortion of planes
q state difference between elastic and plastic deformationans elastic deformation elastic deformation is that the part of the deformed material when
a dc generator has 300 turns in each field coil the flux per pol is 01 wb find the average value of emf inducet in field winding in the flux decays
q explain the compositional defectsans compositional defect this defect due toa alloying an element to original crystalb
q define the polymorphismans polymorphism it is defined as the change in atomic structure which occurs at a definite transformation temperature
q describe the structure of grain boundaryans one phase of metal contains many grains of various orientation the individual crystals are called
q there is no end centered tetragonal lattice in the bravis list but there is an end centered orthorhombic lattice explain why this is soans a