Outside Operator Training and Plant Safety Practice Test

When the bed is excessively high, the upward gas flow can entrain more solids from the bed and push them into the gas stream. Some of these entrained particles are carried to the cyclone and then returned to the process, causing material to flow back into the bed rather than staying in contact with the hot gas for drying. This looping of solids is called remass. It means material is being recirculated rather than being effectively dried in one pass, which can reduce drying efficiency and drive up energy use. The other options describe outcomes that aren’t aligned with what happens when the bed height is too large.