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Secondary hardening in steels arises out of the

A. Precipitation of fine alloy carbides at high temperatures

B. Refinement of ferrite grain size by working

C. Decomposition of retained austenite upon heat treatment

D. Precipitation of complex inter-metallic upon heat treatment

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  1. Bad odour in sanitary latrines is reduced by periodically sprinkling
  2. Austempering process results in the formation of __________ structure.
  3. Babbitt lining is used on brass/bronze bearings to increase the
  4. __________ property of a material is determined by the Herbert Pendulum device.
  5. Earing is a defect found in steels after the following metal working operation.
  6. Silicon in steel
  7. Material of construction of foundry crucible is
  8. Liquor poisoning generally occurs due to the presence of __________ in it.
  9. The most abundant metal present in the earth's crust is;
  10. The cathode in an electrochemical cell always carries
  11. Dew point temperature always gives an indication of the __________ of the moist air.
  12. According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear…
  13. __________ furnace is generally used in the non-ferrous foundries.
  14. A material being tested for endurance strength is subjected to the __________ load.
  15. Pick out the correct statement
  16. Filler material used in welding should have __________ as compared to the parent metal to be welded.
  17. Recrystallisation temperature of steel is __________ °C.
  18. Chromium molybdenum steel cannot be welded using __________ welding.
  19. Viscoelastic behaviour is observed in __________ materials.
  20. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where,…
  21. Identify the correct statement.
  22. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a…
  23. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an…
  24. Thermistors are used in __________ devices.
  25. Hot extrusion process is not used for making
  26. LVDT used for displacement measurement is a/an __________ transducer.
  27. Which of the following materials has the maximum shrinkage allowance?
  28. Which of the following fastening devices has a head at one end and a nut fitted to the other?
  29. Propulsion of rocket follows from the
  30. Which of the following materials does not form adherent oxide film on surface?