What is a CV joint and its function?

• A. A device that stores energy for starting and ignition.
• B. A device that permits the drive shaft to bend without speed variation.
• C. A constant-velocity joint allows smooth drive shaft rotation with minimal speed variation.
• D. A component that transmits electrical energy to the vehicle's sensors.

Answer: (C)

A CV joint enables the drive shaft to bend as the suspension and steering move, while keeping the rotational speed of the wheel nearly constant. The essential function is to transmit torque through varying angles without causing noticeable speed changes, so power is delivered smoothly and vibrations or driveline binding are minimized. It’s not about storing energy or delivering electricity, which is why those other descriptions don’t fit.