Rotory cams are the __ common type. most least normalest strongest

Rotory cams are the **most** common type.<br /><br />**Explanation:**<br />Rotary cams, also known as rotary valve engines, are widely used in various applications due to their simplicity and efficiency. They are commonly found in small engines, such as those used in lawnmowers, chain saws, and some automotive engines. The design of rotary cams allows for a simple and robust mechanism that can handle high speeds and pressures, making them a popular choice for many engineering applications.