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Buttress threads are usually found on

A. Screw cutting lathes

B. Feed mechanisms

C. Spindles of bench vices

D. Railway carriage couplings

Correct Answer : D.


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  1. While designing a screw in a screw jack against buckling failure, the end conditions for the screw are…
  2. The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________…
  3. A coupling used to connect two perfectly aligned shafts, is
  4. In the levers of first type, the mechanical advantage is __________ one.
  5. According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter…
  6. The flank of the tooth is the
  7. Which of the following statement is correct regarding power screws?
  8. 18/8 steel contains
  9. Residual stress in materials
  10. If the centre distance of the mating gears having involute teeth is increased, then the pressure angle
  11. The building up of worn and undersized parts, subjected to repeated loads by electroplating is
  12. In composite or reverse laid ropes
  13. Transverse fillet welded joints are designed for
  14. The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are…
  15. The shock absorbing capacity of a bolt may be increased by
  16. For steel, the ultimate strength in shear as compared to ultimate strength in tension is
  17. In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known…
  18. If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then…
  19. The number of slots in a 25 mm castle nut is
  20. The maximum bending stress in a curved beam having symmetrical section always occur at the
  21. The property of a bearing material which has the ability to accomodate shaft deflections and bearing…
  22. Which one of the following is a positive drive?
  23. When carbon in the cast iron is principally in the form of graphite, the cast iron will be of
  24. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant…
  25. Which of the following statement is correct?
  26. For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be
  27. A backing ring is used inside the pipe joint when making a
  28. If threads on a bolt are left hand, threads on nut will be
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  30. The material commonly used for machine tool bodies is