764. A dense structure in grinding wheel is used for
A.Heavy cuts
B.Finishing cuts
C.Elastic material
D.Hard material

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765. Pick up the incorrect statement about Al2O3 grinding wheel
A.It is less tough than SiC
B.It is suitable for high tensile strength material
C.It is used for grinding hardened steel, hard bronze, steel billets etc
D.It is less hard than SiC

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766. Ball grinding compared to cylindrical and flat grinding requires
A.Harder wheel
B.Softer wheel
C.Medium wheel
D.Harder/softer wheel depending on material

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767. Hard materials require
A.Fine grit sizes and hard grades
B.Coarse grit sites and hard grades
C.Coarse grit sizes and soft grades
D.Fine grit sizes and soft grades

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768. Soft ductile materials require
A.Fine grit sizes and hard grades
B.Coarse grit sizes and hard grades
C.Coarse grit sizes and soft grades
D.Fine grit sizes and soft grades

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769. When the grains of a grinding wheel become dulled, then it needs to be
A.Replaced
B.Trued
C.Dressed
D.Treated

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770. The hardness of a grinding wheel is specified by
A.BHN
B.LPN
C.Letter of alphabet
D.Search test

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