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A lead-screw with half nuts in a lathe, free to rotate in both directions has

A. V-threads

B. Whitworth threads

C. Buttress threads

D. Acme threads

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  1. In drilling operation, the metal is removed by
  2. In drilling aluminium, a drill with
  3. Cutting fluids are used to
  4. In order to achieve a specific surface finish in single point turning, the most important factor to…
  5. Which among the NC operations given below are continuous path operations? Arc Welding (AW), Drilling…
  6. A jig is defined as a device which
  7. The grinding operation is a
  8. The common welding error that occurs due to wrong speed, faulty preparation, and high / low current,…
  9. Stellite preserves hardness upto a temperature of
  10. The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting…
  11. Hardness of steel greatly improves with
  12. The aluminium oxide abrasive is chiefly used for grinding
  13. In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
  14. Which of the following statement is correct about hot machining?
  15. In Oxyacetylene gas welding, temperature at the inner cone of the flame is around
  16. Discontinuous chips are formed during machining of
  17. The grinding of long, slender shafts or bars is usually done by
  18. In centreless grinders, the regulating wheel is inclined at
  19. The cutting speed for drilling aluminium, brass and bronze with high speed steel drills varies from
  20. The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions…
  21. The size of a shaper is given by
  22. The angle between the shear plane and __________ is called shear angle.
  23. The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece,…
  24. The height of each tooth of a broach is
  25. In order to prevent tool from rubbing the work _________ on tools are provided.
  26. When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and…
  27. The lip angle is the angle
  28. Chip breakers are used to
  29. A tool used to withdraw a drill from the sleeve is called
  30. In centreless grinding, work place centre will be