For a jaw crusher, which of the following is NOT a determining factor for its electrical energy consumption during operation?

Introduction / Context:
Crusher power draw is influenced by duty conditions and setting. Accurately assessing what factors influence energy consumption is important for energy audits and optimisation.

Given Data / Assumptions:

• Jaw crusher operating at steady conditions.
• Variables: feed size, product size (closed side setting), capacity (throughput).

Concept / Approach:
Power required correlates with the amount of breakage performed per unit time. Finer product (smaller CSS) increases breakage intensity, raising energy. Larger feed requires more energy to achieve the same product. Higher capacity means more mass processed per unit time, raising total power (though specific energy may vary). Therefore, each listed factor influences energy consumption.

Step-by-Step Solution:
Evaluate feed size: larger feed → more fracture work.Evaluate product size: finer setting → more energy per mass.Evaluate capacity: more tonnes/h → more power draw.Conclude all three affect energy; hence “none of these”.

Verification / Alternative check:
Empirical crusher power models include size reduction ratio and throughput explicitly.

Why Other Options Are Wrong:
Selecting any single variable as irrelevant contradicts practical crusher power behaviour.

Common Pitfalls:
Confusing specific energy (kWh/t) with absolute power (kW); both still depend on size targets and throughput.

Final Answer:
None of these (all affect energy consumption)