Home

The efficiency of a square threaded screw is maximum if the helix angle is equal to (Where φ = Angle of friction)

A. 90° - φ

B. 45° - φ

C. 45° - φ/2

D. 45° + φ/2

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. When an open coiled helical compression spring is subjected to an axial compressive load, the stress…
  2. Whether any core is required in wire ropes
  3. The minimum number of teeth on the pinion which will mesh with any gear without interference for 20°…
  4. In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged…
  5. A sliding bearing in which although lubricant is present, the working surfaces __________ contact each…
  6. The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive)…
  7. The number of slots in a 25 mm castle nut is
  8. The draw of cotter need not exceed
  9. For maximum power, the velocity of the belt will be
  10. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch…
  11. The shock resistance of steel is increased by adding
  12. The velocity of sliding ________ the distance of the point of contact from the pitch point.
  13. Two shafts A and B under pure torsion are of identical length and identical weight and are made of the…
  14. Which of the following material has the maximum ductility?
  15. If a material fails below its yield point, failure would be due to
  16. In radial bearings, the load acts __________ to the axis of rotation.
  17. The expression 0.175 - 0.841/T is the Lewis form factor for
  18. In standard taper roller bearings, the angle of taper of outer raceway is
  19. A single strap butt joint is always in __________ shear.
  20. Fabric belts are used in industrial applications because
  21. The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________…
  22. Residual stress in materials
  23. The smallest diameter of an external or internal screw thread is known as
  24. In designing a key, it is assumed that the distribution of forces along the length of key
  25. According to I.B.R., the factor of safety of riveted joint should not be less than
  26. A bolt of M 24 × 2 means that
  27. The shock absorbing capacity of a bolt may be increased by
  28. The ratio of endurance limit in shear to the endurance limit in flexure is
  29. A screw is said to be a self locking screw, if its efficiency is
  30. A feather key is generally