ASME Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The formula for calculating the efficiency of a ligament with even pitch involves understanding the relationship between the pitch (P) and the diameter (d) of the ligament. Efficiency in this context is generally defined as the ratio of useful output to the total input, and here it draws from geometric and mechanical principles.

The correct formula, which is P - d / P, succinctly captures how the dimensions of the ligament (the pitch and diameter) influence its performance or effectiveness. In this case, subtracting the diameter from the pitch gives an adjusted measure of the effective length or distance that can be utilized in the design, reflecting the physical realities of how these components interact.

Using this formula allows engineers to calculate the proportion of the effective length of the ligament against the overall pitch, thereby providing a clear understanding of its performance efficiency. The lower the diameter relative to the pitch, the greater the efficiency, as more of the ligament can carry load effectively without being compromised by the constraints of its form. This assists in the optimization of design where strength and resourcefulness of material must be balanced.

In contrast, other options do not represent a suitable formula for efficiency. The addition of pitch and diameter or multiplication of the two does not relate to the meaning of efficiency in this