Washing of coal is done to reduce the
Washing of coal is done to reduce the
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³.
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³.
Pick out the wrong statement.
Pick out the wrong statement.
Gray King Assay and Swelling Index of a coal is a measure of its
Gray King Assay and Swelling Index of a coal is a measure of its
Abel apparatus is used for those oils, whose flash points are___°F.
Abel apparatus is used for those oils, whose flash points are___°F.
Which of the following would require maximum amount of % excess air for complete combustion?
Which of the following would require maximum amount of % excess air for complete combustion?
The calorific value of producer gas is around __________ kcal/Nm³
The calorific value of producer gas is around __________ kcal/Nm³
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the
Low temperature oxidation of stored coal results in the
Low temperature oxidation of stored coal results in the
A good coking coal should have high __________ content.
A good coking coal should have high __________ content.
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?
Fuel consumption in coke making can be reduced by
Fuel consumption in coke making can be reduced by
During combustion of coal on grate, clinker formation is increased by the
During combustion of coal on grate, clinker formation is increased by the
High temperature carbonisation of coal takes place at __________ °C.
High temperature carbonisation of coal takes place at __________ °C.
Steam is intermittently admitted into the fuel bed during the production of producer gas to
Steam is intermittently admitted into the fuel bed during the production of producer gas to
Mott and Wheeler test is conducted on coke to find its
Mott and Wheeler test is conducted on coke to find its
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is
Which of the following combustibles is absent in blast furnace gas?
Which of the following combustibles is absent in blast furnace gas?
Yield of pitch from distillation of high temperature tar is around __________ percent.
Yield of pitch from distillation of high temperature tar is around __________ percent.
Actual flame temperature is always lower than the adiabatic flame temperature, because there is
Actual flame temperature is always lower than the adiabatic flame temperature, because there is
In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by
In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by
With increase in moisture content of coal, its
With increase in moisture content of coal, its
A good quality coal should have
A good quality coal should have
Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
High sulphur content in a fuel __________ of the flue gases.
High sulphur content in a fuel __________ of the flue gases.
Pick out the wrong statement.
Pick out the wrong statement.
During coking of coal, the ash content (percentage)
During coking of coal, the ash content (percentage)
Micum Index of a coke is a measure of its
Micum Index of a coke is a measure of its
Pick out the wrong statement.
Pick out the wrong statement.
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Which of the following has the highest flame speed?
Which of the following has the highest flame speed?
'Wobbe index' is a characteristic of
'Wobbe index' is a characteristic of
Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
In high temperature carbonisation of coal compared to low temperature carbonisation
In high temperature carbonisation of coal compared to low temperature carbonisation
Ratio of primary air to secondary air increases with increase in the rank of coal, because the
Ratio of primary air to secondary air increases with increase in the rank of coal, because the
Volatile matter content of metallurgical coke may be around __________ percent.
Volatile matter content of metallurgical coke may be around __________ percent.
Pick out the wrong statement.
Pick out the wrong statement.
Which of the following coke has the least percentage of ash?
Which of the following coke has the least percentage of ash?
Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Pick out the wrong statement.
Pick out the wrong statement.
Which of the following is not a binder for coal briquetting?
Which of the following is not a binder for coal briquetting?
The cuprous chloride used in orsat apparatus can absorb
The cuprous chloride used in orsat apparatus can absorb
Which of the following is not endothermic?
Which of the following is not endothermic?
Caking index of a coal is a measure of its
Caking index of a coal is a measure of its
Which of the following has the highest calorific value?
Which of the following has the highest calorific value?
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.
Natural draught produced by a chimney depends upon the
Natural draught produced by a chimney depends upon the
Sometimes water is sprayed during coal charging in the coke oven, which helps in
Sometimes water is sprayed during coal charging in the coke oven, which helps in
Which will have the least volatile matter and hence will be the most difficult to ignite?
Which will have the least volatile matter and hence will be the most difficult to ignite?
Which of the following can be made into briquettes without the use of a binder?
Which of the following can be made into briquettes without the use of a binder?
Too much of excess air in combustion results in high
Too much of excess air in combustion results in high
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
Pick out the wrong statement.
Pick out the wrong statement.
Rate of low temperature oxidation of coal due to bad storage conditions
Rate of low temperature oxidation of coal due to bad storage conditions
For maximum discharge through a chimney, its height should be
For maximum discharge through a chimney, its height should be
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.
If oxygen content in the flue gas rises too high, fuel is being wasted by
If oxygen content in the flue gas rises too high, fuel is being wasted by
Oxygen percentage (by weight) in atmospheric air is
Oxygen percentage (by weight) in atmospheric air is
Catalyst used in Fischer-Tropsch process is
Catalyst used in Fischer-Tropsch process is
A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is
A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is
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The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always
The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always
The main drawback of supplying more excess air in the combustion of fuel is the
The main drawback of supplying more excess air in the combustion of fuel is the
Use of preheated air for combustion of fuel in the furnace, increases the
Use of preheated air for combustion of fuel in the furnace, increases the
Coking time in beehive coke oven is about
Coking time in beehive coke oven is about
Which of the following fuel gases has the highest calorific value ?
Which of the following fuel gases has the highest calorific value ?
Increase in ash content of blast furnace coke
Increase in ash content of blast furnace coke
__________ of the coal is the basis for Seylor's coal classification.
__________ of the coal is the basis for Seylor's coal classification.
Which of the following is a primary fuel?
Which of the following is a primary fuel?
Coal tar fuel - 200 (CTF 200) is a mixture of
Coal tar fuel - 200 (CTF 200) is a mixture of
Octane number of 2, 2, 4 - trimethyl pen-tane is
Octane number of 2, 2, 4 - trimethyl pen-tane is
Supply of excess air for complete combustion of fuel is necessitated to facilitate
Supply of excess air for complete combustion of fuel is necessitated to facilitate
The pyragallol solution used in orsat apparatus can absorb
The pyragallol solution used in orsat apparatus can absorb
Coke oven gas is stripped of its H₂S and mercaptans content by
Coke oven gas is stripped of its H₂S and mercaptans content by
Low temperature carbonisation of coal takes place at __________ °C.
Low temperature carbonisation of coal takes place at __________ °C.
Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.
Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.
Blast furnace gas compared to coke oven gas has
Blast furnace gas compared to coke oven gas has
High rate of heating of coke ovens
High rate of heating of coke ovens
Naphthalene is removed from coke oven gas by
Naphthalene is removed from coke oven gas by
Abrasion index of blast furnace coke should be around __________ percent.
Abrasion index of blast furnace coke should be around __________ percent.
Low temperature oxidation of coal during storage does not decrease its
Low temperature oxidation of coal during storage does not decrease its
Calorific value of bituminous coal may be around __________ Kcal/kg.
Calorific value of bituminous coal may be around __________ Kcal/kg.
By-products are __________ recovered in 'Beehive ovens'.
By-products are __________ recovered in 'Beehive ovens'.
Which of the following is not a product of tar distillation?
Which of the following is not a product of tar distillation?
Combustion of pulverised coal as compared to that of lump coal
Combustion of pulverised coal as compared to that of lump coal
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
Main constituent of natural gas is
Main constituent of natural gas is
Calorific value of dry wood may be around __________ Kcal/kg.
Calorific value of dry wood may be around __________ Kcal/kg.
Weathering of coal during storage causes
Weathering of coal during storage causes
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.
Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.
Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Low temperature oxidation of coal is accelerated by the
Low temperature oxidation of coal is accelerated by the
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its
Quantity of coke produced from metallurgical coal may be around __________ percent.
Quantity of coke produced from metallurgical coal may be around __________ percent.
The calorific value of natural gas is about __________ kcal/Nm³.
The calorific value of natural gas is about __________ kcal/Nm³.
Calorific value of wood gas is about __________ kcal/Nm³.
Calorific value of wood gas is about __________ kcal/Nm³.
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.
