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Trepanning is an operation of

A. Making a cone-shaped enlargement of the end of a hole

B. Smoothing and squaring the surface around a hole

C. Sizing and finishing a small diameter hole

D. Producing a hole by removing metal along the circumference of a hollow cutting tool

Correct Answer : D.


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  1. The main purpose of spheroidising treatment is to improve
  2. For harder alloy steel, the point angle of the drill is kept
  3. Fixtures are used
  4. In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.
  5. The hard grade grinding wheels are denoted by the letters
  6. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter…
  7. In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰⁰⁴⁰…
  8. Ultrasonic machining is best suited for
  9. In lapping operation, the amount of metal removed is
  10. The method of grinding used to produce a straight or tapered surface on a workpiece, is
  11. In drilling operation, the metal is removed by
  12. The high cutting speed and large rake angle of the tool will result in the formation of
  13. The lathe centres are provided with standard taper known as
  14. In which of the following machine, the work is usually rotated while the drill is fed into work?
  15. The operation of smoothing and squaring the surface around a hole is known as
  16. A dynamometer is a device used for the measurement of
  17. The angle on which the strength of the tool depends is
  18. What is the welding defect caused due to improper control and poor removal of slog between passes called?
  19. In order to prevent tool from rubbing the work _________ on tools are provided.
  20. EDM machining is applied for
  21. The advantage of a broaching operation is that
  22. The material which on machining produces chips with built up edge is
  23. Misrun is a casting defect which occurs due to
  24. The grinding of long, slender shafts or bars is usually done by
  25. The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is…
  26. The height of each tooth of a broach is
  27. Tumbler gears in lathe are used to
  28. In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is
  29. Slow speed of the spindle is necessary in
  30. The helix angle of a drill is __________ for drilling brass.