Junker's calorimeter is used to determine the calorific value of
A coal having high amount of volatile matter
Which of the following is not used as a binder in coal briquetting ?
When incomplete combustion loss is high, the flue gas analysis shows large amount of
Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Gray King Assay and Swelling Index of a coal is a measure of its
Higher percentage of ash in coal meant for the production of metallurgical grade coke
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
Laboratory gas is obtained by the cracking of
Combustion reaction of fuels is a/an __________ reaction.
Higher efficiency in the combustion of solid fuel can not be achieved by
Carbon Content by weight in air dried wood may be about __________ percent.
Size of blast furnace grade coke is __________ mm.
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
The gas which contributes maximum to the heating value of natural gas is
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
Which of the following gaseous fuels has the lowest calorific value ?
Explosion limit of blast furnace gas istogas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
Combustion of pulverised coal as compared to that of lump coal
'Wobbe index' is a characteristic of
Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O) ?
Bituminous coal
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
A coal containing very high percentage of durain is called __________ coal.
Which of the following accentuates clinker-ing trouble on furnace grate burning coal ?
The internal energy of the combustion products is __________ compared to that of reactants.
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
Actual flame temperature is always lower than the adiabatic flame temperature, because there is
A coal with high ash content is undesirable, as
Presence of free moisture in coal during its high temperature carbonisation
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Ratio of primary air to secondary air increases with increase in the rank of coal, because the
Which of the following constituents of coal is the most important in the production of coke?
During combustion of gaseous fuels, deficiency of air
Natural draught produced by a chimney depends upon the
Gross & net calorific value is the same for
Which of the following is not a product of tar distillation ?
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of aboutC to avoid the
In high temperature carbonisation of coal compared to low temperature carbonisation
Coke oven gas consists mainly of
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
High temperature in gasification of coal favours
Gross and net calorific value of a fuel will be the same
Which of the following is used for making the explosive 'TNT' ?
Low temperature carbonisation
Softening temperature of coal ash is a measure of the __________ of coal.
"Overfire burning" in a furnace is a phenomenon characterised by the