Air/gas ratio for complete combustion will be the highest for
Combustion of pulverised fuel
Steam is intermittently admitted into the fuel bed during the production of producer gas to
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
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
Preheating of coal charge for the coke ovens reduces the
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.
The catalyst used in shift converter is
Which of the following would require least amount of secondary air for combustion ?
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is
Which of the following is unsuitable fuel for producer gas manufacture ?
Calorific value of coke oven gas is around __________ Kcal/Nm3.
Naphthalene is used for making
A good coking coal should have high __________ content.
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
Artificial draught produced by a fan can be controlled by the
Water gas constitutes mainly of
Moisture loss is determined by the
Beehive coke oven
Turndown ratio of a gas burner is equal to the
Presence of force moisture in coal is most disadvantageous during its
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.
Low temperature oxidation of coal during storage does not decrease its
In general, the limit of inflammability/explosion limit of fuel gases is widened by the
Which of the following is unsuitable fuel for producer gas manufacture ?
Washing of coal is done to reduce the
Volatile matter content in coking coal may be about __________ percent.
The main function of primary air in pulverised coal fired burner is to
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
'Fat coals' are those coals which have very high
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
A good metallurgical coke
Highly caking coals
The advantage of firing pulverised coal in the furnace lies in the fact, that it
A coal having higher volatile matter content, has lower
Pick out the wrong statement.
Coals used for the generation of producer gas should have
Natural draft created by the chimney depends upon
Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3.
Coke made in narrower by-product coke ovens (as compared to wider ovens) is
Purity of coke means that, it is high in carbon and low in
Tar is a better fuel than furnace oil, because of its
With increase in the oxygen content of the coal, its __________ decreases.
Caking coal is desirable for
Volumetric ratio of N2 to O2 in dry atmospheric air is
__________ is used as jet engine fuel.
Fuel for a nuclear reactor (thermal) is
Highly reactive coke have lower
A coal with high ash content
The main advantage of forced draft over natural draft is that