Bulk density of pulverised coal may be about __________ kg/m3.
A fuel with high heat release rate will
High pressure coal gasification is employed in __________ process.
Coke ovens in steel plant are heated by
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the __________ of coal.
KOH solution used in orsat apparatus absorbs
Coke oven gas is stripped of its H2S and mercaptans content by
In Lurgi coal gasifier,
The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorifice value will be
The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
Deficiency of combustion air during combustion of a gaseous fuel
Which of the following is not a by-product fuel ?
Blast furnace coke is made from coal by
A travelling grate stoker is meant for the efficient burning of __________ coal.
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm3/ton coal (ash = 35%).
Calorific value of dry wood may be around __________ Kcal/kg.
Coke oven gas constitutes mainly of
'Fuel' can be defined as a substance which produces heat by
Flue gas from the heating chamber of byproduct coke ovens is removed by
Coke oven gas is a better fuel than blast furnace gas, because of its higher
Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.
Which of the following has the highest theoretical flame temperature ?
Dry air requirement for burning 1 Nm3 of CO to CO2 may be around __________ Nm3.
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3 ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
One kg of carbon for theoretically complete combustion requires __________ kg of air.
Gray-King Assay and Roga Index of coal is a measure of its
A coal having high volatile matter content will
Traces of tar fog present in the coke oven gas is removed by
Which of the following fuels is the best for burning on chain grate stoker ?
Froth floatation is used for
Preheating of combustion air is done to
Gross heating value of coal is __________ the net heating value.
Yield of blast furnace gas is about __________ Nm3 /ton of pig iron.
Pick out the wrong statement.
Calorific value of gobar gas (containing CH4 =, H2 = ; CO2 = 30%) may be about __________ Kcal/Nm3.
Gross heating value of coal is __________ the net heating value.
Which of the following is a rich fuel gas ?
Washing of coal
Short/intense flame is produced during combustion of gaseous fuel by using
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
Ultimate analysis of coal determines its __________ content.
(64-rank coal (ASTM) means a coal with 64%
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
Ash content in the coke produced from a coking coal havingash may be around __________ percent.
In low temperature carbonisation of coal, the
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm3 gas ?
Percentage of nitrogen in blast furnace gas may be around
If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as