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Damage to metal surface by mechanical action is called

A. Pitting

B. Corrosion

C. Erosion

D. None of these

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

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  1. The thermodynamic law, = constant, is not followed by the
  2. Case hardening is not done by
  3. Fibrous fracture is normally encountered in the __________ materials.
  4. Which of the following material handling equipments is not suitable for moving materials in varying…
  5. A jig is used while __________ a hole.
  6. Stresses encountered in the metal forming processes are less than the __________ of the material.
  7. The surface tension of a liquid, at critical temperature is
  8. Dowtherm is a
  9. Identify the false statement
  10. Wrought iron is not
  11. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation…
  12. Chlorine acts as a bleaching agent only in the presence of
  13. The co-ordination number in simple cubic structure is
  14. Matte smelting is used in the extraction of
  15. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
  16. Which of the following relationships is correct for relating the three elastic constants of an isotropic…
  17. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
  18. __________ of test specimens is not involved in any hardness testing method.
  19. According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point…
  20. Which of the following approaches the ideal gas behaviour most closely?
  21. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean…
  22. Blast furnace slag is mainly molten
  23. Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
  24. Which of the following has the least value of ultimate tensile strength (UTS)?
  25. Oxyacetylene reducing flame is used while carrying out welding on
  26. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 >…
  27. Addition of silicon to cast iron
  28. In an eutectic system, two elements are completely
  29. Which of the following is resistant to the action of both heat & chemicals?
  30. Isotropic materials have the same __________ in all directions.