Screen capacity (throughput) depends on many variables. Which of the following is generally not considered an intrinsic design/operation function for capacity estimation?

Introduction / Context:
Screen capacity correlates with aperture, open area, vibration parameters, inclination, and feed characteristics. This question asks you to identify the parameter that is not an intrinsic design/operation variable in capacity equations.

Given Data / Assumptions:

• Standard sizing methods focus on mechanical and geometric factors.
• Feed moisture affects performance, but ambient humidity per se is not a direct capacity term.
• We assume normal industrial indoor/outdoor conditions.

Concept / Approach:
Capacity expressions include aperture size, open area, vibration frequency/amplitude, angle, and bed depth. While humidity may influence feed moisture indirectly, it is not an explicit design variable like opening size or mechanism. Therefore, “atmospheric humidity” is not a capacity function in standard design correlations.

Step-by-Step Solution:
List core design variables in capacity equations.Distinguish environmental conditions from intrinsic screen parameters.Identify atmospheric humidity as not directly used.

Verification / Alternative check:
Vendor sizing charts and empirical formulas omit ambient humidity, focusing on screen geometry and motion.

Why Other Options Are Wrong:
Opening size/mechanism/surface/angle: all key determinants of capacity.

Common Pitfalls:
Confusing feed moisture (which matters) with ambient humidity as a standalone design variable.

Final Answer:
Atmospheric humidity