Mechanical Engineering MCQs

A. provide air around burners for obtaining optimum combustion
B. transport and dry the coal
C. cool the scanners
D. supply air for ignitors

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 mositure, volatile, fixed carbon and ash
D. Fuel constituents as percents by weight of mositure, volatile, fixed carbon and ash

A. Form lumps or masses of coke
B. Burn freely
C. Show little or no fusing action
D. Burn completely

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

A. Keep the burner tips cool
B. Aid in proper combustion
C. Cause sputtering, possibly extinguish¬ing flame
D. Clean the nozzles

A. Heating the oil in the settling tanks
B. Cooling the oil in the settling tanks
C. Burning the oil
D. Suspension

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 forced draft fan

A. Increase thermal efficiency of boiler
B. Economise on fuel
C. Extract heat from the exhaust flue gases
D. Increase flue gas temperature

A. 21%
B. 23%
D. 30%
D. 40%

A. Correct fuel air ratio
B. Proper ignition temperature
C. 02 to support combustion
D. All the three above