Question 19Steam Plants - 1st Asst/Chief

The correct answer is A) Insulating cement. Insulating cement is composed of wool fibers and clay binders, which make it a refractory material suitable for high-temperature applications. The wool fibers provide insulation and the clay binders help hold the material together. The other options are not correct because: B) Castable fireclay is composed of refractory clay and aggregates, without the wool fiber component. C) Chrome castable ore is a refractory material made from chromite ore, not wool fibers and clay. D) "All of the above" is incorrect, as only option A) accurately describes the composition of insulating cement.