The procedure prohibits the use of fans to assist in cooling extruded specimens.

• A. True
• B. Not specified
• C. It is required
• D. False

Answer: (D)

Cooling extruded specimens requires controlling the rate of temperature change so the material’s properties aren’t altered by abrupt cooling. Most procedures don’t ban using a fan outright; they either specify acceptable cooling methods or simply provide the cooling requirements (temperature targets and time). Because the document doesn’t state a blanket prohibition on fans, saying that fans are prohibited is not accurate. If cooling speed needs to be increased, a fan can be used as long as the airflow is controlled and the final temperature and timing meet the procedure’s specifications. In short, the procedure does not prohibit fans, so the statement is not correct and the best approach is to follow the specified cooling requirements and apply a fan only when allowed and appropriate.