The axial thrust of the coupling shown in...

The axial thrust of the coupling shown in...

Question 1 of 270705eccefa3bacbc34ba4d47cf4

The axial thrust of the coupling shown in the illustration, tends to draw the runner and impeller together when the __________. See illustration MO-0089.

Question 1 of 27070

Q

The axial thrust of the coupling shown in the illustration, tends to draw the runner and impeller together when the __________. See illustration MO-0089.

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🔍 Key Concepts

• hydraulic coupling axial thrust caused by fluid circulation between runner and impeller • effect of filling level of the coupling (partially filled vs full) on pressure distribution • how fluid viscosity changes torque transmission but not necessarily the direction of axial thrust

💭 Think About

• Look at the flow path between the impeller and runner in the illustration: when that space is completely full of moving fluid, what kind of pressure pattern forms between the two rotors? • Which condition in the answer choices would create the most uniform, balanced hydrostatic and hydrodynamic pressure between the faces of the runner and impeller, tending to pull them toward each other? • Which options mainly affect how much torque is transmitted, versus which option most directly affects the axial force along the shaft direction?

✅ Before You Answer

• Identify which choice would create maximum, nearly uniform pressure in the working chamber between the runner and impeller. • Distinguish between conditions that change torque capacity and those that change axial thrust direction/magnitude. • Confirm from the illustration that the axial force comes from fluid pressure between the opposed faces of the runner and impeller, not from the actuating lever or external mechanical parts.