Mechanical Engineering MCQs

Page No. 8

Secondary air is the used to_________________?


aprovide air around burners for obtaining optimum combustion

✓


btransport and dry the coal

✖


cconvert CO (formed in lower zone of furnace) into C02 at higher zone

✖


dair delivered by induced draft fan

✖



Water and sediment in fuel oil can be removed by _______________________?


aheating the oil in the settling tanks

✓


bcooling the oil in the settling tanks

✖


cburning the oil

✖


dsuspension

✖



Presence of moisture in fuel oil would____________________?


akeep the burner tips cool

✖


baid in proper combustion

✖


ccause sputtering, possibly extinguish¬ing flame

✓


dclean the nozzles

✖



Primary air is the air used to__________________?


aprovide air around burners for obtaining optimum combustion

✖


btransport and dry the coal

✓


cconvert CO (formed in lower zone of furnace) into C02 at higher zone

✖


dair-delivered by forced draft fan

✖



02 content in atmospheric air on volume basis is___________________?


a21%

✓


b23%

✖


c30%

✖


d40%

✖


View Answer 21%

The economizer is used in boilers to _______________________?


aincrease thermal efficiency of boiler

✓


beconomise on fuel

✖


cextract heat from the exhaust flue gases

✖


dincrease flue gas temperature

✖



For combustion of a fuel, following is essential_____________________?


acorrect fuel air ratio

✖


bproper ignition temperature

✖


c02 to support combustion

✖


dall the three above

✓


View Answer all the three above

Bomb calorimeter is used to determine ___________________?


aHigher calorific value at constant volume

✓


bLower calorific value at constant volume ,

✖


cHigher calorific value at constant pressure

✖


dLower calorific value at constant pressure

✖



Proximate analysis of fuel is determination of percentage of ____________________?


acarbon, hydrogen, nitrogen, sulphur, moisture

✖


bfixed carbon, ash, volatile matter, moisture

✓


chigher calorific value

✖


dlower calorific value

✖



Reheating of steam under ideal conditions takes place at constant __________________?


aentropy

✖


benthaply

✖


cpressure

✖


dtemperature

✓


View Answer temperature

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