Explosion limit of blast furnace gas is 37 to 71% gas 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.
Explosion limit of blast furnace gas is 37 to 71% gas 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.
Blast furnace gas constitutes mainly of
Blast furnace gas constitutes mainly of
Calorific value of coke oven gas is around __________ Kcal/Nm³.
Calorific value of coke oven gas is around __________ Kcal/Nm³.
Pick out the correct statement.
Pick out the correct statement.
Highly reactive coke have lower
Highly reactive coke have lower
A sooty flame can be made non-luminous by
A sooty flame can be made non-luminous by
Laboratory gas is obtained by the cracking of
Laboratory gas is obtained by the cracking of
Pulverised coal used in boiler firing need not have
Pulverised coal used in boiler firing need not have
High pressure coal gasification is employed in __________ process.
High pressure coal gasification is employed in __________ process.
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
High temperature in gasification of coal favours
High temperature in gasification of coal favours
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.
Which of the following gaseous fuels is likely to have the highest gross calorific value?
Which of the following gaseous fuels is likely to have the highest gross calorific value?
Function of secondary air in pulverised coal firing is to
Function of secondary air in pulverised coal firing is to
'Mixed gas' used in steel plants is a mixture of
'Mixed gas' used in steel plants is a mixture of
Which adsorbant is used for removing sulphur compounds (S Q, H₂S, RSH etc.) removal from coke oven gas in by-products recovery plant ?
Which adsorbant is used for removing sulphur compounds (S Q, H₂S, RSH etc.) removal from coke oven gas in by-products recovery plant ?
Mineral matter content (M) and ash content (A) in coal are approximately related as
Mineral matter content (M) and ash content (A) in coal are approximately related as
Height of coke oven is limited (say maximum upto 7 metres) mainly by the
Height of coke oven is limited (say maximum upto 7 metres) mainly by the
Which of the following has the highest gross calorific value?
Which of the following has the highest gross calorific value?
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
A travelling grate stoker is meant for the efficient burning of __________ coal.
A travelling grate stoker is meant for the efficient burning of __________ coal.
Bulk density of pulverised coal may be about __________ kg/m³.
Bulk density of pulverised coal may be about __________ kg/m³.
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 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 combustion reaction, C + O₂ = CO₂, is
The combustion reaction, C + O₂ = CO₂, is
Number of macrocomponents present in coal according to Stopes are
Number of macrocomponents present in coal according to Stopes are
A good metallurgical coke should have very low
A good metallurgical coke should have very low
Presence of free moisture in coal is most disadvantageous during
Presence of free moisture in coal is most disadvantageous during
The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .
The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .
Which of the following is called "blue gas"?
Which of the following is called "blue gas"?
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.
Bomb calorimeter can be used to determine the __________ of the coal.
Bomb calorimeter can be used to determine the __________ of the coal.
The advantage of firing pulverised coal in the furnace lies in the fact, that it
The advantage of firing pulverised coal in the furnace lies in the fact, that it
Low temperature carbonisation
Low temperature carbonisation
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having
Highly caking coals
Highly caking coals
Coking time in narrow by-product coke ovens is around __________ hours.
Coking time in narrow by-product coke ovens is around __________ hours.
Percentage of carbon monoxide in blast furnace gas may be around
Percentage of carbon monoxide in blast furnace gas may be around
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
Coal tar (produced by high temperature carbonisation) is the main source of
Coal tar (produced by high temperature carbonisation) is the main source of
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as
__________ present in coal is not determined in its ultimate analysis.
__________ present in coal is not determined in its ultimate analysis.
Caking index of the coal blend used for the manufacture of metallurgical coke should be around
Caking index of the coal blend used for the manufacture of metallurgical coke should be around
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
Calorific value of furnace oil is about __________ Kcal/kg.
Calorific value of furnace oil is about __________ Kcal/kg.
Calorific value as determined by bomb calorimeter is the
Calorific value as determined by bomb calorimeter is the
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of
Blast furnace gas burns with a bluish flame, because of the presence of
Blast furnace gas burns with a bluish flame, because of the presence of
Which of the following oil gasification processes is non-catalytic?
Which of the following oil gasification processes is non-catalytic?
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion
Calorific value of of blast furnace gas is around __________ KCal/Nm³.
Calorific value of of blast furnace gas is around __________ KCal/Nm³.
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
Higher efficiency in the combustion of solid fuel can not be achieved by
Higher efficiency in the combustion of solid fuel can not be achieved by
Naphthalene is used for making
Naphthalene is used for making
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain
Efficient burning of anthracite coal requires
Efficient burning of anthracite coal requires
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
Nitrogen in coal
Nitrogen in coal
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?
Largest constituent of blast furnace gas is
Largest constituent of blast furnace gas is
Most of the coking coals are
Most of the coking coals are
Higher fuel combustion efficiency can not be achieved by
Higher fuel combustion efficiency can not be achieved by
(64-132) rank coal (ASTM) means a coal with 64%
(64-132) rank coal (ASTM) means a coal with 64%
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
For long flame and easy ignition, the coal used should have
For long flame and easy ignition, the coal used should have
Which of the following accounts for maximum energy loss in a boiler?
Which of the following accounts for maximum energy loss in a boiler?
With increase in C/H ratio of a fuel, the dew point of flue gases
With increase in C/H ratio of a fuel, the dew point of flue gases
Coke oven gas consists mainly of
Coke oven gas consists mainly of
Presence of free moisture in coal during its high temperature carbonisation
Presence of free moisture in coal during its high temperature carbonisation
Percentage of nitrogen in blast furnace gas may be around
Percentage of nitrogen in blast furnace gas may be around
Kopper-Totzek coal gasifier
Kopper-Totzek coal gasifier
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of
Which is the most matured coal?
Which is the most matured coal?
About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.
About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.
Which of the following fuels is generally not used in thermal power plant boiler firing?
Which of the following fuels is generally not used in thermal power plant boiler firing?
Gross and net calorific value of a fuel will be the same
Gross and net calorific value of a fuel will be the same
(64-132) rank coal (ASTM) means a coal with 64%
(64-132) rank coal (ASTM) means a coal with 64%
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
__________ prohibits the use of alcohols directly in petrol engines.
__________ prohibits the use of alcohols directly in petrol engines.
Percentage of hydrogen in coke oven gas may be around
Percentage of hydrogen in coke oven gas may be around
Washing of coal does not reduce its
Washing of coal does not reduce its
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
Percentage of methane in coke oven gas may be around
Percentage of methane in coke oven gas may be around
In Lurgi coal gasifier,
In Lurgi coal gasifier,
Which of the following is not a by-product fuel?
Which of the following is not a by-product fuel?
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
Coke oven gas burns with an yellowish flame, because of the presence of
Coke oven gas burns with an yellowish flame, because of the presence of
Desirable "Micum Index" values of metal-lurical coke are
Desirable "Micum Index" values of metal-lurical coke are
Blast furnace coke is made from coal by
Blast furnace coke is made from coal by
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.
Coke oven gas compared to blast furnace gas is
Coke oven gas compared to blast furnace gas is
Which of the following is the most poisonous gas?
Which of the following is the most poisonous gas?
Coke compared to the coal from which it has been made, contains
Coke compared to the coal from which it has been made, contains
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?
Which of the following is not a 'manufactured' fuel?
Which of the following is not a 'manufactured' fuel?
