Question 357Steam Plants - 1st Asst/Chief

70% to pass

A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing _______________.

Ato allow the leveling plates to pivot on the collar when thrust loads are applied
Bfor adjusting the filler piece thickness behind the pivotal-shoes to give a more accurate fit
Cfor the shoes to tilt slightly, thereby allowing the formation of a wedge shaped oil film under a thrust load
Dfor automatically adjusting clearances to the correct value when wear occurs
AI Explanation

The correct answer is C: for the shoes to tilt slightly, thereby allowing the formation of a wedge shaped oil film under a thrust load. The Kingsbury or pivot shoe type thrust bearing is designed to allow the individual shoes to tilt slightly when a thrust load is applied. This tilting motion creates a wedge-shaped oil film between the shoe and the collar, which can support much greater loads per square inch compared to parallel surface bearings. The wedge-shaped oil film is what enables the Kingsbury bearing to handle higher thrust loads effectively. The other answer choices are incorrect because they do not directly address the key feature of the Kingsbury bearing that allows it to support higher loads - the ability of the shoes to tilt and form a wedge-shaped oil film.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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