764. A dense structure in grinding wheel is used for
A.Heavy cuts
B.Finishing cuts
C.Elastic material
D.Hard material
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
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
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
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
769. When the grains of a grinding wheel become dulled, then it needs to be
A.Replaced
B.Trued
C.Dressed
D.Treated
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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