Related Questions

Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
A Low reactivity of carbonised residue containing high proportion of iron & sulphur
B Low forced draft & fuel bed temperature
C Thick firebed and preheated primary air
D All of the above
The reason for excessive clinker formation in gas producers is the
A Use of coal/coke containing a high % of fines and ash
B Use of fuel having too low an ash fusion temperature
C Development of hot spots in the fuel bed and an abnormally high rate of gasification
D All of the above
The best suited coal for chain or traveling grate stoker boiler is
A Coking coal
B Non-coking or free burning coal
C Pulverized coal
D High sulphur coal
A travelling grate stoker is meant for the efficient burning of __________ coal.
A Caking
B Pulverised
C Non-caking
D High ash
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
Combustion of pulverised coal compared to the lumpy coal
A Provides better control of furnace temperature
B Facilitates combustion with lower excess air
C Provides higher thermal efficiency & flame temperature
D All of the above
Cement clinker is reduced to fine size by a
A Roll crusher
B Ball mill
C Tube mill
D Hammer mill
Which of the following types of coal represents the first stage of formation of coal?
A Anthracite
B Lignite
C Peat
D Bituminous
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

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