A. Use of thick fire bed
B. Low fusion point of ash (< 1100° C)
C. Use of preheated primary air
D. All A., B. & C.
Related Mcqs:
- Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than _______________ °C is liable to form clinker?
A. 1100
B. 1250
C. 1350
D. 1400 - A travelling grate stoker is meant for the efficient burning of ______________ coal?
A. Caking
B. Pulverised
C. Non-caking
D. High ash - Which of the following accentuates clinkering trouble on furnace grate burning coal ?
A. Low reactivity of carbonised residue containing high proportions of iron & sulphur
B. Low forced draught and fuel bed temperature
C. Thick fire bed and preheated primary air
D. All A., B. and C. - Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?
A. 1000
B. 4000
C. 6000
D. 8000 - 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 - 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 - Use of preheated air for combustion of fuel in the furnace, increases the___________________?
A. Scale losses of the furnace stock
B. Calorific value of the fuel
C. Flame temperature
D. None of these - 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 - Which of the following fuels is the best for burning on chain grate stoker ?
A. Non-caking coal
B. Caking coal
C. Coking coal
D. Pulverised coal - The temperature at which plastic layer formation takes place during carbonisation of coal varies from ______________ °C ?
A. 100 to 150
B. 350 to 450
C. 550 to 650
D. 700 to 850
