The two types of shaft misalignment to check and correct in the vertical and horizontal planes are __ & __.

• A. Vertical, Horizontal
• B. Radial, Axial
• C. Angular, Parallel
• D. Angular, Perpendicular

Answer: (C)

The two main forms of shaft misalignment you check in both vertical and horizontal planes are angular misalignment and parallel (offset) misalignment. Angular misalignment means the two shaft axes aren’t in a straight line, so the angle between them causes the gap between coupling faces to change along the shaft length. Parallel misalignment means the axes are parallel but displaced so the centerlines do not coincide, giving a constant offset along the length. In practice you correct angular misalignment by tilting one machine’s shaft relative to the other, and you correct parallel misalignment by shifting one shaft so the centerlines align. Other terms like radial or axial aren’t treated as distinct misalignment types in this context.