High excess air in combustion of fuels results in
High excess air in combustion of fuels results in
Caking coal is desirable for
Caking coal is desirable for
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Traces of tar fog present in the coke oven gas is removed by
Traces of tar fog present in the coke oven gas is removed by
Which of the following is a lean fuel gas?
Which of the following is a lean fuel gas?
When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.
When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.
Benzene is used
Benzene is used
Fixed carbon in coal is defined as
Fixed carbon in coal is defined as
Preheating of coal charge for the coke ovens reduces the
Preheating of coal charge for the coke ovens reduces the
Natural draft created by the chimney depends upon
Natural draft created by the chimney depends upon
Advantages of fluidised bed combustion are
Advantages of fluidised bed combustion are
Which of the following is a rich fuel gas?
Which of the following is a rich fuel gas?
Combustion of pulverised fuel
Combustion of pulverised fuel
Which of the following fuel gases is heavier than air?
Which of the following fuel gases is heavier than air?
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
High ash containing coke
High ash containing coke
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?
Main use of soft coke is as __________ fuel.
Main use of soft coke is as __________ fuel.
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.
Coal is pulverised before burning in large capacity boiler furnaces mainly to
Coal is pulverised before burning in large capacity boiler furnaces mainly to
The main function of primary air in pulverised coal fired burner is to
The main function of primary air in pulverised coal fired burner is to
'Fuel' can be defined as a substance which produces heat by
'Fuel' can be defined as a substance which produces heat by
__________ process is meant for direct hydrogenation of coal to produce liquid fuel.
__________ process is meant for direct hydrogenation of coal to produce liquid fuel.
Which of the following is coking?
Which of the following is coking?
Which of the following is unsuitable fuel for producer gas manufacture?
Which of the following is unsuitable fuel for producer gas manufacture?
Safe condition for storage of high V.M. bituminous coal is that
Safe condition for storage of high V.M. bituminous coal is that
Preheating of a gaseous fuel results in increased
Preheating of a gaseous fuel results in increased
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.
Which of the following has the highest heat of combustion?
Which of the following has the highest heat of combustion?
Gray-King Assay and Roga Index of coal is a measure of its
Gray-King Assay and Roga Index of coal is a measure of its
Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the
Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
Which of the following is not applicable to fluidised bed combustion of coal?
Which of the following is not applicable to fluidised bed combustion of coal?
The calorific value is the highest out of the following for
The calorific value is the highest out of the following for
Fischer-Tropsch method aims at the
Fischer-Tropsch method aims at the
High temperature carbonisation of coal produces
High temperature carbonisation of coal produces
The gas which contributes maximum to the heating value of natural gas is
The gas which contributes maximum to the heating value of natural gas is
Pick out the wrong statement.
Pick out the wrong statement.
Coalification means the
Coalification means the
'Fat' coal means a coal having
'Fat' coal means a coal having
In low temperature carbonisation (as compared to high temperature carbonisation) of coal
In low temperature carbonisation (as compared to high temperature carbonisation) of coal
High ash coals
High ash coals
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
Compound coke ovens are those which can be heated by
Compound coke ovens are those which can be heated by
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.
Fuel combustion is never cent per cent efficient due to
Fuel combustion is never cent per cent efficient due to
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at
L.D. converter gas (produced in steel plant) comprises mainly of
L.D. converter gas (produced in steel plant) comprises mainly of
The most matured coal out of the following is
The most matured coal out of the following is
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
Size of blast furnace grade coke is __________ mm.
Size of blast furnace grade coke is __________ mm.
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
As time passes, the calorific value of stored coal
As time passes, the calorific value of stored coal
The heat of combustion of a fuel
The heat of combustion of a fuel
Calorific value of
Calorific value of
The cooling medium used in dry quenching of coke is
The cooling medium used in dry quenching of coke is
Coking coals are invariably
Coking coals are invariably
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by
Use of excess of combustion air in the combustion of fuels results in
Use of excess of combustion air in the combustion of fuels results in
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
In high temperature carbonisation (as compared to low temperature carbonisation) of coal
In high temperature carbonisation (as compared to low temperature carbonisation) of coal
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)
Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)
Overfire burning in a furnace is a phenomenon characterised by the
Overfire burning in a furnace is a phenomenon characterised by the
Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?
Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?
A coal having high amount of volatile matter
A coal having high amount of volatile matter
Which of the following has the highest theoretical flame temperature ?
Which of the following has the highest theoretical flame temperature ?
Hard pitch is used for making
Hard pitch is used for making
Assam coals suffers mainly from the disadvantage of high __________ content.
Assam coals suffers mainly from the disadvantage of high __________ content.
Froth floatation is used for
Froth floatation is used for
A coal with high __________ content, would ignite most easily.
A coal with high __________ content, would ignite most easily.
A coal having high volatile matter content will
A coal having high volatile matter content will
Turndown ratio of a gas burner is equal to the
Turndown ratio of a gas burner is equal to the
Shatter index of the coke is a measure of its
Shatter index of the coke is a measure of its
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
Hard coke is manufactured from
Hard coke is manufactured from
Fossil fuels mean
Fossil fuels mean
Low temperature carbonisation of coal produces
Low temperature carbonisation of coal produces
Spontaneous combustion of coal on storage results due to
Spontaneous combustion of coal on storage results due to
The maximum adiabatic flame temperature is attained, when the fuel is burnt with
The maximum adiabatic flame temperature is attained, when the fuel is burnt with
Cannel coal and boghead coal are the examples of
Cannel coal and boghead coal are the examples of
Which of the following is a measure of the agglutinating (i.e., binding) property of coal?
Which of the following is a measure of the agglutinating (i.e., binding) property of coal?
Preheating of combustion air is done to
Preheating of combustion air is done to
Main constituents of purified Lurgi gas are
Main constituents of purified Lurgi gas are
The shift conversion reaction taking place during water gas manufacture is given by
The shift conversion reaction taking place during water gas manufacture is given by
As the equilibrium moisture content of the coal increases, its
As the equilibrium moisture content of the coal increases, its
Deficiency of combustion air during combustion of a gaseous fuel
Deficiency of combustion air during combustion of a gaseous fuel
Which of the following is not a manufactured fuel ?
Which of the following is not a manufactured fuel ?
Stack heat losses can be minimised by
Stack heat losses can be minimised by
The internal energy of the combustion products is __________ compared to that of reactants.
The internal energy of the combustion products is __________ compared to that of reactants.
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
In general, the limit of inflammability/explosion limit of fuel gases is widened by the
In general, the limit of inflammability/explosion limit of fuel gases is widened by the
