⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs401
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 E. air fed to pulverisers
402
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 E. filtering
403
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 E. reduce flame length
404
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 E. none ot the above
405
02 content in atmospheric air on volume basis is___________________?
A21%
B23%
D40% E. 70%
406
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 E. to heat feed water by bled steam
407
For combustion of a fuel, following is essential_____________________?
Acorrect fuel air ratio
Bproper ignition temperature
C02 to support combustion
Dall the three above E. none of the above
408
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 E. None of the above
409
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 E. rough analysis
410
Reheating of steam under ideal conditions takes place at constant __________________?
Aentropy
Benthaply
Cpressure
Dtemperature E. all of the above