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
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
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.
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.
A coal containing very high percentage of durain is called __________ coal.
A coal containing very high percentage of durain is called __________ coal.
Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
Ammonia content in raw coke oven gas is about __________ gm/Nm³.
Ammonia content in raw coke oven gas is about __________ gm/Nm³.
With increase in moisture content of coal, its
With increase in moisture content of coal, its
Tar is a better fuel than furnace oil, because of its
Tar is a better fuel than furnace oil, because of its
Gobar gas is produced by the __________ of 'gobar' (cow dung).
Gobar gas is produced by the __________ of 'gobar' (cow dung).
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.
C/H ratio is the maximum in case of
C/H ratio is the maximum in case of
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.
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
__________ is used as jet engine fuel.
__________ is used as jet engine fuel.
Main constituents of benzol are
Main constituents of benzol are
High temperature carbonisation of coal produces
High temperature carbonisation of coal produces
When incomplete combustion loss is high, the flue gas analysis shows large amount of
When incomplete combustion loss is high, the flue gas analysis shows large amount of
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is
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.)
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) ?
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.
Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.
Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.
A coal with high ash content
A coal with high ash content
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
Which of the following is not used as a binder in coal briquetting?
Which of the following is not used as a binder in coal briquetting?
Pick out the wrong statement.
Pick out the wrong statement.
The main advantage of forced draft over natural draft is that
The main advantage of forced draft over natural draft is that
Anthracite can be used for
Anthracite can be used for
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
Combustion of pulverised fuel
Combustion of pulverised fuel
The heat of combustion of a fuel
The heat of combustion of a fuel
Caking coal is desirable for
Caking coal is desirable for
Coke made in narrower by-product coke ovens (as compared to wider ovens) is
Coke made in narrower by-product coke ovens (as compared to wider ovens) is
The most matured coal out of the following is
The most matured coal out of the following is
As time passes, the calorific value of stored coal
As time passes, the calorific value of stored coal
Fusion point of coal ash increases with increase in its __________ content.
Fusion point of coal ash increases with increase in its __________ content.
Coal is pulverised before burning in large capacity boiler furnaces mainly to
Coal is pulverised before burning in large capacity boiler furnaces mainly to
Preheating of __________ the flame temperature.
Preheating of __________ the flame temperature.
Ignition temperature of a fuel in air is __________ that in pure oxygen.
Ignition temperature of a fuel in air is __________ that in pure oxygen.
Compound coke ovens are those which can be heated by
Compound coke ovens are those which can be heated by
Which of the following constituents of coal is the most important in the production of coke?
Which of the following constituents of coal is the most important in the production of coke?
A good metallurgical coke
A good metallurgical coke
Artificial draught produced by a fan can be controlled by the
Artificial draught produced by a fan can be controlled by the
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
'Fuel' can be defined as a substance which produces heat by
'Fuel' can be defined as a substance which produces heat by
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.
The main product of high temperature carbonisation of coal is
The main product of high temperature carbonisation of coal is
High excess air in combustion of fuels results in
High excess air in combustion of fuels results in
Calorific value of
Calorific value of
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
Gross & net calorific value is the same for
Gross & net calorific value is the same for
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?
With increase in the temperature of carbonisation of coal
With increase in the temperature of carbonisation of coal
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
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
A coal with high ash content is undesirable, as
A coal with high ash content is undesirable, as
Grindability index of a coal is 100. It implies that the
Grindability index of a coal is 100. It implies that the
A particular coal is said to be free burning when it
A particular coal is said to be free burning when it
Gross heating value of coal is __________ the net heating value.
Gross heating value of coal is __________ the net heating value.
Pick out the wrong statement.
Pick out the wrong statement.
Pick out the wrong statement.
Pick out the wrong statement.
Benzol is used
Benzol is used
Ignition temperature decreases progressively from anthracite to lignite, because
Ignition temperature decreases progressively from anthracite to lignite, because
Bituminous coal
Bituminous coal
Water gas constitutes mainly of
Water gas constitutes mainly of
Coal containing large quantity of __________ are difficult to wash.
Coal containing large quantity of __________ are difficult to wash.
Anthracite coal
Anthracite coal
High sulphur (4-6%) coal in India are found in
High sulphur (4-6%) coal in India are found in
Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?
Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Coalification means the
Coalification means the
Fuel for a nuclear reactor (thermal) is
Fuel for a nuclear reactor (thermal) is
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be
Size of blast furnace grade coke is __________ mm.
Size of blast furnace grade coke is __________ mm.
High amount of sulphur and phosphorous in coke causes
High amount of sulphur and phosphorous in coke causes
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
Which of the following constituents of a fuel does not contribute to its calorific value on combustion?
Which of the following constituents of a fuel does not contribute to its calorific value on combustion?
Beehive coke oven
Beehive coke oven
Very __________ coals are completely devoid of cokability i.e, it is non coking.
Very __________ coals are completely devoid of cokability i.e, it is non coking.
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?
Fuel for a fast breeder nuclear reactor is
Fuel for a fast breeder nuclear reactor is
Coking coals are invariably
Coking coals are invariably
Benzene is used
Benzene is used
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
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
Fixed carbon in coal is defined as
Fixed carbon in coal is defined as
The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction.
n.
The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction.
n.
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively
Coke oven gas is a better fuel than blast furnace gas, because of its higher
Coke oven gas is a better fuel than blast furnace gas, because of its higher
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.
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
Fuel combustion is never cent per cent efficient due to
Fuel combustion is never cent per cent efficient due to
