Technician A says that in any type of fluid coupling not equipped with a mechanical lock-up some slippage exists resulting in a difference between input and output speeds.Technician B says that in torque converter coupling phase impeller and turbine rpms match.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Nilam Patel · Accepted Answer

Final Answer : A, Explanation :  Technician A is correct because in fluid couplings, including torque converters, there is always some degree of slippage between the input (driven by the engine) and the output (connected to the transmission), except when a mechanical lock-up feature is engaged. Technician B is incorrect because during the coupling phase of a torque converter, the impeller and turbine RPMs do not match exactly due to this inherent slippage.

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