Mechanical Engineering Mcqs

Tertiary air is the air used to____________________?
  • (A)  provide air around burners for obtaining optimum combustion
  • (B)  transport and dry the coal
  • (C)  cool the scanners
  • (D)  supply air for ignitors
  • (E)  convert CO (formed in lower zone of furnace) into C02 at higher zone
The ultimate analysis of fuel lists _____________________?
  • (A)  various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
  • (B)  various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
  • (C)  fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
  • (D)  fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
  • (E)  moisture and ash free heating value
Secondary air is the used to_________________?
  • (A)  provide air around burners for obtaining optimum combustion
  • (B)  transport and dry the coal
  • (C)  convert CO (formed in lower zone of furnace) into C02 at higher zone
  • (D)  air delivered by induced draft fan
  • (E)  air fed to pulverisers