Discussion
The component of torque converter that allows torque multiplication is:
Answer: C
Torque multiplication comes from the stator.
In a torque converter the stator is a fixed set of curved blades between the turbine and the impeller. It turns the fluid leaving the turbine so that it re-enters the impeller in the direction of rotation, helping to drive it. The stator's reaction is what lets the output torque exceed the input torque at low speed ratios.
The impeller (pump) and turbine are also present in a fluid coupling, which cannot multiply torque. The free wheel (one-way clutch) only lets the stator spin freely once multiplication is no longer needed.
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