In a Steam Power Station find the calorific value of coal when 0.4 kg coal is burnt per kWh of generated electricity. The overall efficiency of a steam power plant is 28% | Power Generation MCQ

Power Generation MCQ

In a Steam Power Station find the calorific value of coal when 0.4 kg coal is burnt per kWh of generated electricity. If the overall efficiency of a steam power plant is 28% then the calorific value is:

  1. 4655.38 kcal/kg
  2. 7678.57 kcal/kg
  3. 9545.65 kcal/kg
  4. 10,948.78 kcal/kg

Correct answer: 2. 7678.57 kcal/kg

Explanation:

Overall efficiency = Electrical output (In terms of heat) / Heat of combustion

Overall efficiency = 860/0.4x

x = 860/(0.4*0.28)

x = 7678.57

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