Case hardening is not done by

A. Nitriding

B. Hot dipping

C. Electroplating

D. Both b & c

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  1. Thermit welding uses the following energy source.
  2. The noble metals
  3. Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
  4. L.D. (Linz-Donawitz) converter is used in the production of
  5. Brazing is the joining of metals
  6. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume :…
  7. In an eutectic system, two elements are completely
  8. Joule-Thomson co-efficient is the ratio of
  9. Which of the following heat treatment processes is usually applied to castings?
  10. A solution which resists change in its pH value on addition of acid/alkali is called the __________…
  11. Out of the following, which will fracture most readity, when hit with a hard hammer?
  12. __________ cannot increase the fatigue strength of a material.
  13. Which of the following is resistant to the action of both heat & chemicals?
  14. The mechanism which changes the value of manipulated variable in response to the output signal from…
  15. Eutectoid composition of carbon steel at room temperature is
  16. In chemical dehumidification of air
  17. Euler number is defined as the ratio of inertia force to __________ force.
  18. The mechanism involved in the removal of metal in drilling operation is by
  19. Pick out the wrong statement.
  20. Case hardening of a material is
  21. Maraging steels derive their strength from the following mechanism:
  22. __________ flux is used for the extraction of metal from its self fluxing ores.
  23. Steels with high carbon equivalent have poor Weldability, because in these steels during welding
  24. In case of compression of one kg of air, the work done will be the least, when the value of polytropic…
  25. Pick out the wrong statement.
  26. __________ test can be termed as the semidestructive test.
  27. More than 95% of __________ is present in corundum.
  28. What is the value of entropy at 273°K?
  29. The surface tension of a liquid, at critical temperature is
  30. The condition of diffraction from a crystal is given by