Q1: Normalising does not __________ of a metal.

ANS:B - remove internal stresses

"Normalizing does not remove internal stresses of a metal" is incorrect. Normalizing does, in fact, remove internal stresses in metals. Here's an explanation:

1. Purpose of Normalizing: Normalizing is a heat treatment process used to refine the grain structure of a metal and relieve internal stresses. During the manufacturing process or due to previous heat treatment or mechanical work, metals can develop internal stresses. These stresses can affect the mechanical properties and dimensional stability of the metal.
2. Heat Treatment Process: In normalizing, the metal is heated to a temperature above its critical transformation temperature and then cooled in still air. The cooling rate is slower than that of quenching, resulting in the formation of a more uniform and refined grain structure.
3. Relieving Internal Stresses: As the metal undergoes heating and cooling during normalizing, the internal stresses are gradually relieved. This is because the process allows the metal to undergo a more uniform transformation, reducing the non-uniformities that contribute to internal stresses.
4. Effectiveness in Stress Relief: Normalizing is effective in relieving internal stresses because it allows the metal to achieve a more balanced and relaxed state. By promoting the formation of a more uniform grain structure, normalizing helps redistribute the internal stresses, leading to a more stable and stress-free material.
5. Improved Mechanical Properties: Removing internal stresses through normalizing can improve the mechanical properties of the metal, such as strength, toughness, and dimensional stability. It also prepares the metal for further processing or use in applications where uniformity and reliability are important.

In summary, normalizing is an effective heat treatment process for removing internal stresses in metals by promoting the formation of a more uniform grain structure. This helps improve the mechanical properties and dimensional stability of the metal, making it more suitable for various engineering applications.