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Which mounting does the stator require?

  • A.A rigid mounting to the converter housing, which holds it stationary at all times during the operation
  • B.A bearing allowing free rotation
  • C.A splined connection to the turbine, which drives it at the same speed as the output of the converter assembly
  • D.A one way clutch on a fixed shaft

Answer: D

The stator must be held against the reaction torque at low speed but must freewheel once the turbine approaches impeller speed. A rigid mounting would cause it to obstruct the flow and destroy the efficiency at cruise. The one way clutch handles both conditions. Naming what changes and what stays the same is the reliable route through questions of this shape. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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