A. More
B. Less
C. Equal
D. More or less; (depends on the state of fuel.)
Related Mcqs:
- Use of excess of combustion air in the combustion of fuels results in__________________?
A. Heat losses
B. Long flame
C. Condensation of water vapour from the fuel gas
D. None of these - Deficiency of combustion air during combustion of a gaseous fuel_____________________?
A. Lengthens the flame
B. Causes heat loss of fuel by its partial combustion
C. Both A. & B.
D. Shortens the flame - Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300°) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?
A. 5
B. 10
C. 20
D. 35 - Combustion of pulverised coal as compared to that of lump coal ________________?
A. Develops a non-luminous flame
B. Develops a low temperature flame
C. Can be done with less excess air
D. Provides a lower rate of heat release - Advantages of fluidised bed combustion are ____________________?
A. Reduced NOx formation in flue gas
B. Lower furnace operating temperature
C. High heat transfer rate
D. All A., B. & C. - Presence of nitrogen in combustion air does not reduce the ____________________?
A. Amount of heat liberated
B. Flame temperature
C. Flue gas temperature
D. Any of the above - If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?
A. Low
B. High
C. Very high, if the fuel is of low calorific value
D. None of these - Coke compared to the coal from which it has been made, contains ____________________?
A. Less volatile matter
B. More carbon
C. Greater percentage of ash
D. All A., B. and C. - The main drawback of supplying more excess air in the combustion of fuel is the_________________?
A. Excessive power requirement of air blower
B. Enhanced sensible heat loss in the flue gas
C. Intermittent and uncontrolled combustion of the fuel
D. High exit flue gas temperature from the furnace - Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?
A. Its thorough mixing with air
B. Attainment of chemical equilibrium
C. Attainment of high temperature
D. None of these
