Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Where is a thrust bearing least likely to be found?

1. In a reciprocating pump

2. In a marine diesel engine

3. In a turbofan engine

4. In a large gear system

The correct answer is: In a reciprocating pump

The least likelihood of finding a thrust bearing in a reciprocating pump is based on the operational characteristics of the equipment. Reciprocating pumps primarily convert mechanical energy into hydraulic energy using a piston that moves back and forth within a cylinder. This motion is typically linear, and while there are forces acting on the pump components, the primary requirement for thrust bearings, which accommodate axial loads, is minimal in this configuration. In contrast, thrust bearings are commonly found in a marine diesel engine where they help manage the axial loads from the propulsion system, in turbofan engines where they support the rotor assembly against axial thrust during operation, and in large gear systems where they function to support the load generated by the gears’ rotational forces. These applications necessitate the management of axial loads effectively, which is not a primary concern in the standard operation of a reciprocating pump. Therefore, the design and operational dynamics of a reciprocating pump are not conducive to the incorporation of thrust bearings, making it the least likely choice for such a component.