Industrial Energy: A Piecewise Load Schedule

Industrial Energy: A Piecewise Load Schedule

Original quantitative learning practice in English. All 24 questions are included. Four supplied cases exercise six related calculation targets; they form one topic, not four separate tests. Every question includes the complete initial data. Use the stated model and retain intermediate precision. Choose one answer. Learning target: 20/24, not an official pass mark. This bank covers the calculation topic in its title; it is not a complete professional examination, design approval or operating instruction.
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A machine draws 12 kW for 3 h, 6 kW for 2 h, and 1.4 kW for 1 h. It is off for the remainder of a 8 h shift. These are constant electrical input powers for non-overlapping periods. Electricity costs 0.25 currency units per kWh; ignore demand charges and taxes. Calculate the energy during the high-load period in kWh. Keep intermediate values unrounded; round the final result to four decimal places if necessary.