In which of the following phases of torque converter operation will torque be multiplied?

A) lock-up
B) vortex flow
C) rotary flow
D) freewheel

Vortex Flow

Eddy force created by rotational movement. Both a whirlpool and a tornado produce vortex flow, as do the dynamics of a torque converter. See vortex oil flow.

Torque Multiplied

The increase in torque generated through the use of a mechanical system like a gearbox, allowing for greater force to be applied without increasing input power.