2nd Class Power Engineering (2A3) Practice Exam 2026 - Free Power Engineering Practice Questions and Study Guide

Using an expeller in a sealing arrangement offers the distinct advantage of reducing the cost of sealing liquid. The primary function of the expeller is to create a centrifugal effect that helps to throw the sealing liquid back towards the inside of the seal. This reduces the amount of sealing liquid that escapes during operation, thereby minimizing the quantity required for effective sealing.

When sealing liquid is retained more efficiently, operational costs are lowered due to reduced consumption and less frequent need for replenishment. Additionally, this efficient use of sealing liquid can contribute to reduced environmental impact, as less liquid is wasted.

The other aspects, such as increased maintenance, higher sealing liquid consumption, or complexity in installation, generally do not apply in the context of using an expeller, as these factors would typically lead to greater operational costs or challenges rather than benefits.