Which will have the least volatile matter and hence will be the most difficult to ignite?
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at
Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
The cuprous chloride used in orsat apparatus can absorb
(64-rank coal (ASTM) means a coal with 64%
Percentage of carbon monoxide in blast furnace gas may be around
Low temperature carbonisation of coal produces
High sulphur (4-6%) coal in India are found in
Sulphur in metallurgical coal
Which of the following is not a binder for coal briquetting ?
Pick out the wrong statement.
Ammonia content in raw coke oven gas is about __________ gm/Nm3.
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
Which of the following is not endothermic?
High sulphur content in a fuel __________ of the flue gases.
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
Coking time in narrow by-product coke ovens is around __________ hours.
High rate of heating of coke ovens
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.
Very __________ coals are completely devoid of cokability i.e, it is non coking.
By-products are __________ recovered in 'Beehive ovens'.
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its
Main use of soft coke is as __________ fuel.
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively
Mineral matter content (M) and ash content (A) in coal are approximately related as
The main drawback of supplying more excess air in the combustion of fuel is the
Width of the coke oven towards coke side is slightly more than that on pusher side to
Which of the following fuels is generally not used in thermal power plant boiler firing?
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-is about
Volatile matter content of metallurgical coke may be around __________ percent.
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
L.D. converter gas (produced in steel plant) comprises mainly of
Main constituents of purified Lurgi gas are
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
Spontaneous combustion of coal on storage results due to
Preheating of a gaseous fuel results in increased
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.
Which of the following is a lean fuel gas ?
Orsat apparatus is meant for
Coalification means the
Hard coke is manufactured from
Nitrogen in coal
Advantages of fluidised bed combustion are
As time passes, the calorific value of stored coal
Stack (chimney) height in a big thermal power plant is dictated by the