For combustion of a fuel, following is essential

A. Correct fuel air ratio

B. Proper ignition temperature

C. O₂ to support combustion

D. All the three above

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  19. The expansion of steam, as it flows over the blades in reaction turbine, represents
  20. The average operating pressure of Benson boiler is
  21. The mechanical draught _________ with the amount of smoke.
  22. In water tube boilers
  23. In fire tube boilers
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