Engine : Expired / Motor Plants and Auxiliary Boilers - 61/354
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| Hydraulic couplings will transmit torque equal to the input torque by means of energy changes in a rotating vortex of liquid. For the vortices to form there must be __________. |
| A) slip between the impeller and runner |
| B) less than 2 per cent slip between the impeller and runner |
| C) axial thrust generated by the runner pinion shaft |
| D) momentary torsional vibration transmitted by the driving impeller |
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