GATE 2025 Chemical Engineering, Q26 · Plant Economics
The correct answer is B, 0.6.
Question
The capital cost (CC) of an industrial equipment varies with its capacity (S) as CC The rule-of-thumb value of the exponent is
Official answer: 0.6
Why
GATE 2025 official key: (B). This is the well-known "six-tenths rule" used for scaling equipment capital cost with capacity.
Explanation cross-checked for consistency. Final answer matches the official IIT answer key.