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In Vickers hardness testing, the pyramid indentor apex is

A. 40°

B. 122°

C. 136°

D. 152°

Correct Answer : C.


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  1. In the levers of first type, the mechanical advantage is __________ one.
  2. In second type of levers,
  3. Antifriction bearings are
  4. The application of third type levers is found in
  5. According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter…
  6. In a full journal bearing, the angle of contact of the bearing with the journal is
  7. A steel containing upto 0.15% carbon is known as
  8. If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and…
  9. If a bearing is designated by the number 305, it means that the bearing is of
  10. A connecting rod should be
  11. Applications in which stresses are encountered in one direction only uses following type of threads
  12. Ball bearing type screws are found in following application
  13. The application of third type levers is found in
  14. Allen bolts are
  15. In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take…
  16. Rankine's theory is used for
  17. In designing thick cylinders, the equation used is
  18. In case of pressure vessels having open ends, the fluid pressure induces
  19. In a steam engine, the piston rod is usually connected to the crosshead by means of a
  20. The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard…
  21. In nitrated parts, the origins of the fatigue cracks will occur at
  22. The designation M 33 × 2 of a bolt means
  23. In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders…
  24. A coupling used to connect two perfectly aligned shafts, is
  25. In order to obtain bolt of uniform strength
  26. Which of the following property is essential for spring materials?
  27. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant…
  28. When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a…
  29. When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile…
  30. The rivet head used for boiler plate riveting is usually