Total primary energy consumption of fuel in the world is lead by a) Coal b) Nuclear c) Hydro d) Oil

Total primary energy consumption of fuel in the world is lead by a) Coal b) Nuclear c) Hydro d) Oil
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coal
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Which of the following accentuates clinkering troubles on furnace grate burning coal? (A) Low reactivity of carbonised residue containing high proportion of iron & sulphur (B) Low forced draft & fuel bed temperature (C) Thick firebed and preheated primary air (D) All (A), (B) and (C)

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Which of the following accentuates clinkering trouble on furnace grate burning coal? (A) Low reactivity of carbonised residue containing high proportions of iron & sulphur (B) Low forced draught and fuel bed temperature (C) Thick fire bed and preheated primary air (D) All (A), (B) and (C)

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Last Answer : (D) All (A), (B) and (C)