Related Questions

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 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
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
During combustion of coal on grate, clinker formation is increased by the
A Use of thick fire bed
B Low fusion point of ash (
C Use of preheated primary air
D All of the above
Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is
A underfeed stoker
B overfeed stoker
C any
D none of the above
Efficient burning of anthracite coal requires
A Low preheat of air
B Fine grinding
C High excess air
D All of the above
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
If h₁ = inner film co-efficient and /h₂ = outer film co-efficient, then the overall heat transfer co-efficient is
A Always less than h₁
B Always between h₁ and h₂
C Always higher than h₂
D Dependent on metal resistance
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
A Reduce SO2 content in
B Catalytically convert SO2 to SO3 in
C Increase the dew point of
D None of these
Dantes heard the key grate in the lock when the
A cell door was shut.
B cell door was opened.
C storeroom was opened
D storeroom was shut.

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