Why should glass articles be annealed?

1 Answer

Answer :

If glass articles are allowed to cool rapidly, glass being bad conductor of heat, the

superficial layer cools down first leaving the interior portion in a state of strain. Due to this

unequal expansion, the articles are likely to crack into pieces.

Related questions

Description : The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium

Last Answer : Option B

Description : To counteract the bad effects of strain hardening on a cold formed part, it must be (A) Tempered (B) Normalised (C) Annealed (D) Hardened

Last Answer : Option C

Description : Copper as conductor for cables is used as (a) annealed (b) hardened and tempered (c) hard drawn (d) alloy with chromium

Last Answer : (a) annealed

Description : Wrought metal is to be, A. Marble B. Quenched C. Subjected /undergone/ to cold treatment during processing (annealed)

Last Answer : C. Subjected /undergone/ to cold treatment during processing (annealed)

Description : Annealed copper is used in A. Low voltage cables B. Flexible wires C. Machine windings D. All of the above. 

Last Answer : Annealed copper is used in A. Low voltage cables B. Flexible wires C. Machine windings D. All of the above. 

Description : The process of gradual cooling of glass articles to room temperature is called

Last Answer : annealing.

Description : The substance added to decolourise the glass articles during manufacture of glass is

Last Answer : Manganese dioxide.