Which of the following is a primary fuel ?
Coke compared to the coal from which it has been made, contains
Pick out the correct statement.
Lurgi coal gasifier is a pressurised __________ bed reactor.
In low temperature carbonisation (as compared to high temperature carbonisation) of coal
High ash containing coke
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.
Low temperature oxidation of stored coal results in the
Which of the following is not a by-product fuel?
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
With increase in calorific value of fuels, their adiabatic flame temperatures
Octane number of4 - trimethyl pen-tane is
Which of the following is not a 'manufactured' fuel ?
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.
Combustion of pulverised coal compared to the lumpy coal
A gaseous fuel in order to develop luminousity on burning, must contain
Which of the following is a single stage, fixed bed high pressure coal gasification process ?
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?
Which is the most matured coal ?
The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 =will be
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm3 .
Washing of coal does not reduce its
Stoichiometric combustion ofkg of carbon requires __________ of oxygen.
The weathering index of a coal
Gross calorific value will be equal to the net calorific value for
Too much of excess air in combustion results in high
Coal tar fuel -(CTFis a mixture of
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm3.
Which of the following has the highest flame speed ?
Use of excess of combustion air in the combustion of fuels results in
Coal tar (produced by high temperature carbonisation) is the main source of
The calorific value is the highest out of the following for
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always
A coal with high __________ content, would ignite most easily.
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
Use of pulverised coal in boiler furnace provides
High ash coals
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by
Percentage of hydrogen in coke oven gas may be around
Function of secondary air in pulverised coal firing is to
Which of the following is not a manufactured fuel ?
Caking index of coal blend used for blast furnace coke making is about
Coking coals are invariably
Which of the following accounts for maximum energy loss in a boiler ?
Coke having higher porosity has
Coal is pulverised before burning in large capacity boiler furnaces mainly to
Bright coal