Question:
\(\ldots\ldots\ldots\ldots\ldots\) is used for annealing of glass.
\(\ldots\ldots\ldots\ldots\ldots\) is used for annealing of glass.
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A lehr is used for controlled cooling of glass articles to remove internal stresses.
Updated On: May 7, 2026
- Pot furnace
- Lehr
- Tunnel kiln
- Blast furnace
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The Correct Option is B
Solution and Explanation
Annealing of glass means controlled cooling of glass articles.
When glass is formed, different parts may cool at different rates.
This produces internal stresses inside the glass.
If these stresses are not removed, glass may crack or break during use.
A lehr is a special furnace used for annealing glass.
In a lehr, glass articles pass slowly through controlled temperature zones.
The glass is first held near the annealing temperature and then cooled gradually.
This removes internal stresses and improves durability.
A pot furnace is used for melting glass.
A blast furnace is used in iron making.
A tunnel kiln is used for firing ceramics.
Therefore, the equipment used for annealing of glass is:
\[
\text{Lehr}.
\]
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