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Tool life is generally better when

A. Grain size of the metal is large

B. Grain size of the metal is small

C. Hard constituents are present in the microstructure of the tool material

D. None of the above

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  1. The in-feed grinding is used to
  2. A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of…
  3. In American Standard Association (A S A) system, if the tool nomenclature is 8-6-5-5-10-15-2 mm, then…
  4. In gear hobbing
  5. The operation of smoothing and squaring the surface around a hole is known as
  6. While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is
  7. In order to grind soft material
  8. In metal machining, the zone where the heat is generated due to friction between the moving chip and…
  9. For harder alloy steel, the point angle of the drill is kept
  10. The material property which depends only on the basic crystal structure is
  11. The tool life is said to be over if
  12. Drilling is an example of
  13. When the temperature of a solid metal increases,
  14. In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.
  15. In a single point tool, the angle between the surface of the flank immediately below the point and a…
  16. While current is shut down in the welding circuit, what kind of voltage exists between the output terminals…
  17. The ductile materials, during machining, produce
  18. The lip angle of a single point tool is usually
  19. In up milling, the thickness of chip is
  20. The angle between the lathe centres is
  21. Carbide tipped tools usually have
  22. Ceramic tools are fixed to tool body by
  23. Internal or external threads of different pitches can be produced by
  24. The cutting angle of a flat drill varies from
  25. The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions…
  26. The cutting speed is maximum while machining __________ with a high speed steel tool.
  27. If the helix angle of the drill is made _________ 30°, then the torque required to drive the drill…
  28. The lip angle is the angle
  29. Broaching is applied for machining
  30. The type of reamer used for reaming operation in a blind hole, is