🔍 Key Concepts

• Function of a bridge gauge on a main propulsion turbine bearing • Difference between clearance measurements and material thickness measurements • What part of the turbine a bearing actually supports or contacts

💭 Think About

• Ask yourself: What does a bridge gauge physically span across and what relative position is it trying to measure? • Consider: Is a bearing more about supporting the shaft with a film of oil, or about measuring the remaining thickness of its lining? • Think: Which of these options refers to something that actually exists at the turbine bearing location, versus in other turbine components like diaphragms or blades?

✅ Before You Answer

• Verify which options are associated directly with bearings (journal, oil film, wear) rather than stationary/rotating blading or diaphragms. • Check what a bridge gauge reading tells you about the relationship between the shaft/journal and the bearing shell. • Eliminate any choices that refer to clearances or thicknesses that are not located at the bearing itself.