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Thursday, 5 March 2015

Thread Measuring & Thread Gauges - Fill in the Blanks

Thread Measuring & Thread Gauges - Fill in the Blanks Points : thread measuring and thread gauges, mechanical engineering, metrology, mechanical technology, mcqs, evaluation, judgment, gauging, rating, consideration, analysis, examination, workup, test, review, objective type question and answer, fill in the blanks Fill in the Blanks
  1. In a Double start thread, for one complete turn, the thread advances two times as if it were a single thread.
  2. B.A threads are exclusively used for small screws used in optical instruments, clock etc.
  3. Railway threads are used in railway carriage couplers.
  4. V-threads are Pitch strong them square threads.
  5. Crest is the bottom surface joining the two sides a thread.
  6. Acme thread lead screws are very commonly used lathes.
  7. More threads are suitable for power transmission.
  8. Metric threads are used in motor car practice.
  9. All Vee shaped threads absorbs a large amount of power.
  10. Large thread angles cause large bursting forces on the nut.
  11. Depth of thread is the distance between the crest and the roof of a thread measured normal to axis.
  12. Helix is the top surface joining the two sides a thread.
  13. In the Multi Start threaded screw there is movement of more that one thread.
  14. In a double threaded screw, the lead is two times the Lead.
  15. Multi start threads are used on those cases where rapid movement or motion in required.
  16. Square threads are suitable for fastening purposes.
  17. Side is the slant surface of the thread which connects their crest with the roof.
  18. A Screw thread is a helical ridge formed on a uniform section round the curved surface.
  19. Dedendum is the radial distance between the pitch and minor cylinder for External thread.
  20. Axial thickness is the distance between the opposite faces of the same thread measured on the pitch cylinder.
  21. Angle of thread is the angle between the flanks or Slope diameter of threads to differ from the pitch diameter.
  22. Form of Thread is the shape of the contour of one complex thread seen is axial section.
  23. If a point moves along the thread in clockwise direction and thus moves away from the observer, the thread is Right hand.
  24. A Left handed thread is one in which the nuts would be screwed on by turning it to the left.
  25. Root of thread is defined as the bottom of the groove between the two Flanks of the thread.
  26. A Single start threaded screw is one in which there is a movement of one thread for one complete turn round the screw or belt.
  27. Variatiors in either lead or pitch cause the functional or Virtual diameter of threads to differ from the pitch diameter.
  28. Major diameter in case of straight thread, it is the diameter of the major external thread or the root of an Internal thread.
  29. A Right handed thread is one in which the nuts must be turned in a right handed direction to screw it on.
  30. A thread formed cn the inside of a work piece called Internal thread.
  31. A screw thread formed on a cylinder is known straight or Parallel screw threads.
  32. Multiple-start screw thread is produced by forming or more Helical grooves equally spaced.

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