Discussion
A stage rated at \( 4.5 \) t/h is replaced by one at \( 6.5 \) t/h in the line of stages \( 6.0 \), \( 4.5 \), \( 7.0 \) and \( 5.5 \) t/h. The new throughput is
Answer: B
Correct answer: 5.5 t/h
Replacing the 4.5 t/h stage leaves stages of 6.0, 6.5, 7.0 and 5.5 t/h, so the new bottleneck is the 5.5 t/h stage. This is the essence of debottlenecking: relieving one constraint simply reveals the next, and the gain here is 1.0 t/h rather than the 2.0 the new machine might suggest.
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