Discussion
Specific energy consumption of a thresher is normally expressed as
Answer: A
Correct answer: Energy per tonne of grain threshed
Specific energy consumption is the energy used divided by the mass of grain produced, in kilowatt-hours per tonne. A machine drawing 9 kW while threshing 1.2 t/h consumes 7.5 kWh per tonne.
Expressing it this way makes machines of different size and throughput comparable, which a raw power figure cannot do. Energy per hour ignores output entirely, and dividing power by cylinder speed or concave area produces quantities with no useful physical meaning.
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