Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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A gear type flexible coupling is used in a gas turbine application. In this instance, ________

The coupling improves alignment
The coupling develops heat if misalignment occurs
The coupling requires no maintenance
The coupling reduces vibration

The correct answer is: The coupling develops heat if misalignment occurs

In a gas turbine application, a gear type flexible coupling accommodates slight misalignments between the shafts it connects. However, if there is significant misalignment, the coupling can develop heat due to the increased friction and stress on its components. This heat generation is primarily due to the mechanical interaction within the coupling as it attempts to compensate for the misalignment. While one of the roles of the coupling is to improve alignment, this is not its primary function, especially in contexts where misalignment can occur. The statement that it requires no maintenance is not accurate because periodic checks and adjustments may still be necessary to ensure it operates optimally. Additionally, while such couplings can help reduce vibration to a certain extent, they are not specifically designed for this purpose. In summary, the correct understanding of how a gear type flexible coupling functions in cases of misalignment leads to the recognition that heat generation is a significant consequence when misalignments occur.