Question 131Steam Plants - Assistant Engineer

The correct answer is A) 1, which represents "insulating brick" according to the illustration SG-0003 of a typical boiler furnace rear wall. The insulating brick is the first layer of the rear wall, designed to provide thermal insulation and protect the structural integrity of the boiler. This is a critical component to ensure the safe and efficient operation of the boiler system. The other answer choices, B) 2, C) 3, and D) 7, represent different elements of the boiler furnace rear wall, such as the refractory lining, structural steel, and the outer casing, respectively. While these components are also important, they do not directly correspond to the "insulating brick" as depicted in the illustration.