ANS:D - none of these

The electrical energy consumed by a jaw crusher is not a function of the average feed size. Here's why:

1. Average Feed Size:
   • The average feed size refers to the size of the material that enters the jaw crusher.
   • It affects the initial size reduction, but once the material enters the crusher, the electrical energy consumed is more influenced by other factors.
2. Average Product Size:
   • The average product size refers to the size of the crushed material that exits the crusher.
   • It influences the crushing efficiency and the amount of energy required to achieve the desired product size.
3. Machine Capacity:
   • The machine capacity refers to the maximum throughput or production rate of the jaw crusher.
   • Higher capacity generally requires more electrical energy due to increased operation and processing of larger volumes of material.

Therefore, the electrical energy consumed by a jaw crusher is primarily influenced by factors such as the machine capacity, the hardness and abrasiveness of the material being crushed, and the operational efficiency of the crusher itself. The average feed size does not directly dictate the electrical energy consumption once the material is inside the crusher and the crushing process has begun.