Technician A says that when the lock-up clutch is engaged on a torque converter, the coupling ratio between the impeller and turbine has to be 1:1. Technician B says at the fluid coupling point in a torque converter, the impeller and turbine must be rotating at exactly the same speed. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: A
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