đ Key Concepts
⢠Study the floating member shown between the pinion flange and turbine flange and think about what kind of movement it is meant to accommodate (axial vs angular misalignment).
⢠Notice the presence of oil inlets, shaft rings, and oil outlet and relate that to the type of highâspeed, heavily loaded service this coupling is designed for.
⢠Think about a doubleâreduction turbine gear train and where a floating, lubricated coupling would normally be installed in relation to the turbine, highâspeed pinion, first reduction gear, and second reduction gear.
đ Think About
⢠Looking at the labels (pinion flange, turbine flange, floating member), which two components of the gear train is this coupling directly connecting?
⢠Does the detailed oil lubrication system and floating design suggest light, smallâauxiliary duty or main propulsion/highâspeed gearâtrain duty?
⢠Would a coupling like this be designed to take unlimited misalignment, or only small, controlled amounts with very accurate alignment required? How does that affect the truth of the statements given?
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Before You Answer
⢠Verify which parts are actually named in the figure: pinion flange, turbine flange, and floating member and match them to the answer choices.
⢠Check whether any option claims it can handle any misalignment; consider if that is realistic for precision turbine gearing.
⢠Decide if the construction and size shown look like something used only on small auxiliaries or on mainâpropulsion reduction gearing.