___ robots have two straight components joined by a joint - similar to the human forearm and upper arm joined by the elbow.

• A. cartesian
• B. polar
• C. articulated
• D. cylindrical

Answer: (C)

The main idea is an arm-like structure built from rigid links that bend at joints. An articulated robot uses two straight links joined by a rotary joint, like an upper arm and forearm connected at an elbow, allowing bending and multiple motions. This setup is the classic two-link manipulator with an elbow, which is exactly what “articulated” describes. The other terms refer to how the robot moves in space or the shape of its reach: Cartesian robots move along straight linear axes; polar and cylindrical configurations involve pivots around a circle or along a cylindrical path, which aren’t just two straight pieces with a single elbow. So the described two-link, elbow-style arm is best described as an articulated robot.