What term describes the point at which the difference between turbine and impeller speeds is greatest?

What term describes the point at which the difference between turbine and impeller speeds is greatest?

• A. Vortex flow
• B. Torque peak
• C. Slip maximum
• D. Hydraulic resonance

Answer: (A)

The main idea is the difference in rotational speed between the driving turbine and the driven impeller, called the slip. Slip measures how far the impeller lags behind the turbine as energy is transferred to the flowing fluid. The point where this speed difference is greatest is known as slip maximum. This happens under conditions where the impeller cannot accelerate as fast as the turbine due to load or flow limits, so the lag reaches its largest value. Vortex flow describes swirling motion of the fluid, not a measure of speed difference. Torque peak refers to the maximum torque, not the gap between turbine and impeller speeds, and hydraulic resonance is a pressure-wave phenomenon in fluids.

The main idea is the difference in rotational speed between the driving turbine and the driven impeller, called the slip. Slip measures how far the impeller lags behind the turbine as energy is transferred to the flowing fluid. The point where this speed difference is greatest is known as slip maximum. This happens under conditions where the impeller cannot accelerate as fast as the turbine due to load or flow limits, so the lag reaches its largest value. Vortex flow describes swirling motion of the fluid, not a measure of speed difference. Torque peak refers to the maximum torque, not the gap between turbine and impeller speeds, and hydraulic resonance is a pressure-wave phenomenon in fluids.