2nd Class Power Engineering (2A3) Practice Exam 2025 - Free Power Engineering Practice Questions and Study Guide

Chemical coagulating agents play a crucial role in emulsion breaking, specifically by helping in the agglomeration of oil droplets. When emulsions are formed, they create a stable mixture of oil and water, often aided by surfactants that stabilize the emulsion by reducing the surface tension between the two.

The addition of coagulating agents facilitates the process of bringing together smaller oil droplets. These agents neutralize the charges on the surfaces of the droplets or destabilize the surfactants that help keep them dispersed. As a result, the oil droplets can combine into larger clusters, or agglomerates, which can then separate out from the water phase due to gravity. This agglomeration is essential for effective emulsion breaking, as it leads to the separation of the oil from the water, allowing for easier recovery or disposal of the oil.

The other options do not accurately describe the primary function of coagulating agents in this context. For example, enhancing the boiling point of liquids or affecting surfactants does not directly address the action taken to break down emulsions. Converting oil into a non-emulsified form can occur as a result of emulsion breaking but is not the primary mechanism of coagulating agents in this context. Thus, the