666. For fast metal removal rate on lathe, it is recommended to
A.Increase speed
B.Use roughing cut
C.Use carbide tool
D.Use abundant supply of coolant
667. Segmented chips are formed when machining
A.Ductile metal
B.Brittle material
C.Heat treated material
D.With lot of pressure and heat against the tool
668. Machinability
A.Tends to increase with increase in hardness
B.Tends to decrease with increase in hardness
C.Remains-unaffected with hardness
D.Option (B) is correct in general, but it can be drastically influenced by strain hardening and microstructure
669. Machinability depends on
A.Microstructure, physical and mechanical properties and composition of workpiece material
B.Cutting forces
C.Type of chip
D.Tool life
670. Machinability tends to decrease with
A.Increase in hardness and increase in tensile strength
B.Increase in strain hardening tendencies
C.Increase in carbon content, hard oxide and carbide
D.Decrease in grain-size
671. Machinability can be calculated and predicted by following factor
A.Tensile strength
B.Brinell hardness
C.Shear angle
D.All of the above
672. Shear angle varies with
A.Different materials and with tool geometry
B.Cutting speed
C.Feed
D.Machine used
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