Technician A says that during the coupling phase,the impeller and turbine should be turning within 10% of the same speed.Technician B says that the only time that the impeller and turbine turn at exactly the same speed is when the lock-up clutch is engaged.Who is correct?
A) Technician A
B) Technician B
C) Both Technician A and B
D) Neither Technician A nor B

Question

Quizplus · Accepted Answer

During the coupling phase of a torque converter, the impeller and turbine do indeed turn at speeds that are close to each other, but not necessarily within 10% as Technician A suggests. However, Technician B is correct in stating that the impeller and turbine turn at exactly the same speed only when the lock-up clutch is engaged, which bypasses the fluid coupling entirely, creating a direct mechanical connection between the engine and the transmission. Therefore, both technicians are correct in the context of their statements about the operational characteristics of a torque converter and its lock-up clutch.

Technician a Says That During the Coupling Phase,the Impeller and Turbine