Cannel coal and boghead coal are the examples of
Presence of free moisture in coal is most disadvantageous during
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
Yield of pitch from distillation of high temperature tar is around __________ percent.
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
Which of the following has the highest flame velocity ?
The gasification reaction represented by, C + H2O = CO + H2, is
Ignition temperature decreases progressively from anthracite to lignite, because
Anthracite can be used for
Which of the following combustibles is absent in blast furnace gas ?
The heat of combustion of a fuel
Presence of phosphorous in metallurgical coal
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.
Fuel consumption in coke making can be reduced by
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 constituents of a fuel does not contribute to its calorific value on combustion ?
Insitu theory and drift theory are related to the
Which of the following fuel gases is heavier than air ?
The calorific value of producer gas is around __________ kcal/Nm3
High excess air in combustion of fuels results in
'Fat' coal means a coal having
During combustion of coal on grate, clinker formation is increased by the
Pick out the wrong statement.:
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
Pick out the wrong statement.
Correct viscosity of furnace oil at the burner tip for proper atomisation is aboutcentistokes. To reduce the viscosity of high viscosity furnace oil (centistokes) to the correct atomisation viscosity (i.e.cst), it should be preheated to about____°C.
About __________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO.
Abrasion index of blast furnace coke should be around __________ percent.
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
A good metallurgical coke should have very low
For long flame and easy ignition, the coal used should have
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
Coking time in beehive coke oven is about
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
Cannel coal
Which of the following has the highest calorific value (kcal/Nm3) ?
Which of the following will generate maximum volume of product of complete combustion (Nm3/Nm3 of fuel) ?
Use of preheated air for combustion of fuel in the furnace, increases the
Fixed carbon in coal is defined as
Bomb calorimeter can be used to determine the __________ of the coal.
Most of the coking coals are
Washing of coal
Pulverised coal used in boiler firing need not have
Which of the following is a poisonous fuel gas?
Gobar gas constitutes mainly of
During coking of coal, the ash content (percentage)
C/H ratio is the maximum in case of
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?
Calorific value of of blast furnace gas is around __________ KCal/Nm3.