Which term means "Keeping components centered"?

• A. Pillow Block Bearing
• B. Alignment
• C. Lubrication
• D. Pneumatics

Answer: (B)

Keeping components centered is all about aligning the parts so their centerlines run along the same straight axis. In rotating systems, proper alignment ensures shafts, couplings, pulleys, and bearings share a common line of rotation, which minimizes runout and the side forces that cause vibration and premature wear. That precise arrangement is called alignment.

Pillow block bearing is a housing that supports a bearing and helps with supporting and locating a shaft, but it’s not the act of centering components. Lubrication reduces friction and wear but doesn’t address centering. Pneumatics deals with using compressed air for power, control, or actuation, not aligning components. In practice, achieving alignment involves adjusting mounts, shims, or bases and checking with measuring tools to keep the centerlines of connected components colocated within tolerance.