Which of the following spring is used in mechanical wrist watch?

A. Helical compression spring

B. Spiral spring

C. Torsion spring

D. Belleville spring

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

You can do it
  1. The sleeve or muff coupling is designed as a
  2. The flank of the tooth is the
  3. Rankine's theory of failure is applicable for following type of materials
  4. In testing a material for endurance strength, it is subjected to
  5. In most machine members, the damping capacity of the material should be
  6. The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.
  7. Buttress threads are usually found on
  8. The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive)…
  9. Eulers formula for a mild steel column is not valid if the slenderness ratio is
  10. In a steam engine, the piston rod is usually connected to the crosshead by means of a
  11. Which of the following pipe joints would be suitable for pipes carrying steam?
  12. A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum…
  13. A steel containing upto 0.15% carbon is known as
  14. The ratio of endurance limit in shear to the endurance limit in flexure is
  15. In oilness bearings
  16. A bolt is designed on the basis of __________ with a large factor of safety.
  17. In order to remove internal stresses produced by hardening the steel, the process usually adopted is
  18. In standard taper roller bearings, the angle of taper of outer raceway is
  19. The constant factor in case of R10 series of preferred numbers is
  20. The size of a cam depends upon
  21. The suitable material for belt used in flour mill is
  22. In the assembly of pulley, key and shaft
  23. The process extensively used for making bolts and nuts is
  24. Which is correct statement? Stress concentration in static loading is
  25. In block brakes, the ratio of shoe width to wheel diameter is taken between
  26. For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be
  27. The coefficient of friction between the belt and pulley depends upon the
  28. A locking device extensively used in marine type connecting rod ends is a
  29. When a belt drive is transmitting maximum power,
  30. If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according…