Pick out the wrong statement.

A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties

B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness

C. Induction hardening and flame hardening techniques are also used for surface hardening

D. Martempering of a material is a hardening process

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

You can do it
  1. Water hammer is caused in steam carrying pipelines, because of
  2. __________ is the most important element, which controls the physical properties of steel.
  3. Out of the following, the alloy which has equal percentage of constituents, is
  4. Load cells used for the measurement of weight has
  5. __________ is the process used for setting up compressive stresses in the surface of a metal to improve…
  6. Cassiterite is an ore of
  7. Removal of non-condensable from steam or other vapour is termed as the __________ process.
  8. Yield strength of a polycrystalline metal with an average grain size d, is proportional to
  9. Common salt is produced from sea water in India generally by the __________ method.
  10. __________ is not a heat treatment process.
  11. Current employed in resistance welding ranges from __________ kVA/.
  12. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________…
  13. Secondary hardening in steels arises out of the
  14. Air intake for an air compressor should be preferably taken from
  15. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed…
  16. A material being tested for endurance strength is subjected to the __________ load.
  17. Which of the following is not an ore of copper?
  18. In TIG welding, thoriated tungsten electrodes are used, because it
  19. Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.A.…
  20. __________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where…
  21. Materials having __________ lattice structure are usually the most ductile.
  22. The activity of pure hydrogen gas at 1000°C and 5 atm pressure
  23. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
  24. Young's modulus of a material is the measure of its
  25. Which of the following is resistant to the action of both heat & chemicals?
  26. Tempering of a material does not improve its
  27. The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral…
  28. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are…
  29. In case of compression of one kg of air, the work done will be the least, when the value of polytropic…
  30. The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling…