Protective atmospheres in furnaces are used to:
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- Increase fuel consumption
- Enhance heat transfer
- Prevent oxidation and other chemical reactions
- Decrease the thermal efficiency
The Correct Option is C
Solution and Explanation
Step 1: Protective atmospheres are specially controlled gas environments introduced into furnaces to create inert or reducing conditions during heating. These atmospheres typically consist of gases like nitrogen, hydrogen, or argon.
Step 2: Their main function is to prevent unwanted chemical reactions, especially oxidation, which can degrade surface quality, alter material properties, or interfere with metallurgical processes.
Step 3: These atmospheres are crucial in processes such as annealing, sintering, and brazing where material integrity and surface finish must be preserved.
Why the other options are incorrect:
- (A) Protective atmospheres do not inherently increase fuel consumption and are often optimized to reduce waste.
- (B) Their purpose is chemical protection, not thermal enhancement.
- (D) In some cases, they can even improve efficiency by maintaining clean heat transfer surfaces.
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