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Engineering :: Fuels and Combustion


91.  AT a given temperature the enthalpy is the lowest for
A. CO2 B. air
C. SO2 D. H2O

92.  Flue gas viscosities at temperatures TA TB and TC ?C were obtained as 0.020 x 10-3 0.030 x 10-3 and 0.040 x 10-3 kg/m-s respectively. This means that
A. TA = TB = TC B. TA > TB > TC
C. TA < TB < TC D. TA < TC < TB

93.  Flue gas thermal conductivities at temperature TA TB and TC ?C were obtained as 0.020 0.030 and 0.040 Btu/(hr. ft2 ?F/ft) respectively. This means that
A. TA = TB = TC B. TA < TB < TC
C. TA > TB > TC D. TA > TC > TB

94.  Emissivity of oil flames is
A. equal to that of gas flames B. higher than that of gas flames
C. lower than that of gas flames

95.  Production of flue gas as kg/kg of furnace oil at about 40% excess air will aproximately be
A. 1.5 times B. 1 time
C. 20 times D. 50 times

96.  Select the correct statement
A. Vanadium from liquid fuels can be removed by desalting of crude oils B. Vanadium pentoxide produces less heat than hydrocarbons
C. Vanadium is actually bonded onto the hydrocarbons D. The adverse effects of sodium and vanadium together are much less serious than the presence of either one alone

97.  The bright glow of a combustion process is the characteristic of
A. fast and high temperature oxidation B. slow and low temperature oxidation
C. slow and high temperature oxidation D. fast and low temperature oxidation

98.  Actual maximum flame temperatures for the pure combustible gases burnt in unpreheated air range from
A. 1000 to 2000?F B. 2000 to 2500?F
C. 2700 to 3000?F D. 3400 to 3800?F

99.  If CO2 is not fully absorbed by the solution meant for its absorption in the Orsat apparatus it will as
A. N2 B. O2
C. CO




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