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The toughness of a material _________ when it is heated

A. Does not change

B. Increases

C. Decreases

D. None of the Above

Correct Answer : C.


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  1. A machine part subjected to __________ is called a strut.
  2. Buttress threads are usually found on
  3. When screw threads are to be used in a situation where power is being transmitted in one direction only,…
  4. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant…
  5. The rivet head used for boiler plate riveting is usually
  6. The efficiency of a square threaded screw is maximum if the helix angle is equal to (Where φ =…
  7. The minimum number of teeth on the pinion which will mesh with any gear without interference for 20°…
  8. When a helical compression spring is cut into halves, the stiffness of the resulting spring will be
  9. A screw is said to be over hauling screw, if the
  10. In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known…
  11. For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in…
  12. Which of the following statement is correct?
  13. The period during which the cam follower remains at rest, when cam moves, is known as
  14. The suitable material for belt used in flour mill is
  15. For circumferential joint in boilers, the type of joint used is
  16. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch…
  17. The crest diameter of a screw thread is same as
  18. The power transmitted by the belt drive can be increased by
  19. Ball bearing type screws are found in following application
  20. When the speed of belt increases,
  21. In Vickers hardness testing, the pyramid indentor apex is
  22. Slenderness ratio is the ratio of
  23. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making…
  24. The tension on the slack side of the belt is __________ the tension on the tight side of the belt.
  25. The wire ropes make contact at
  26. The resultant axial load on a bolt depends upon
  27. When an open coiled helical compression spring is subjected to an axial compressive load, the maximum…
  28. In a multiple V-belt drive, if one of the belts break, then
  29. The bearings of medium series have capacity __________ over the light series.
  30. In the assembly of pulley, key and shaft