How does a torque converter differ from a clutch?

• A. A torque converter is a fluid coupling allowing slip and smooth torque transfer, while a clutch creates a direct mechanical connection.
• B. A torque converter creates a direct mechanical connection, while a clutch allows slip.
• C. A torque converter uses gears; a clutch does not.
• D. A torque converter is a type of electromagnetic coupling; a clutch is hydraulic.

Answer: (A)

Power transfer between the engine and the transmission is handled differently by a torque converter and a clutch. A torque converter is a fluid coupling that uses circulating transmission fluid between an impeller and a turbine. Because the fluid can slip relative to those rotating parts, the connection is not rigid, which smooths acceleration and often provides torque multiplication at lower speeds. Some designs include a lock-up feature to reduce slip at higher speeds, but the engagement remains a fluid-based, slip-prone connection overall.

A clutch, on the other hand, uses friction surfaces pressed together to create a direct mechanical link between the engine and the transmission. When the clutch is engaged, power is transmitted with essentially no slip, giving immediate, controlled engagement and disengagement for gear changes. Wear, heat, and the need for disengagement during shifting are considerations with clutches.

So the correct statement reflects that a torque converter is a fluid coupling that allows slip and smooth torque transfer, while a clutch creates a direct mechanical connection.