Q.1
Higher fuel combustion efficiency can not be achieved by
Q.2
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
Q.3
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
Q.4
Calorific value of coke oven gas is around __________ Kcal/Nm³.
Q.5
Calorific value of of blast furnace gas is around __________ KCal/Nm³.
Q.6
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?
Q.7
The combustion reaction, C + O₂ = CO₂, is
Q.8
In Lurgi coal gasifier,
Q.9
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
Q.10
Pick out the correct statement.
Q.11
Higher efficiency in the combustion of solid fuel can not be achieved by
Q.12
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
Q.13
A good metallurgical coke should have very low
Q.14
Presence of free moisture in coal is most disadvantageous during
Q.15
High ash containing coke
Q.16
Presence of free moisture in coal during its high temperature carbonisation
Q.17
Which of the following has the highest theoretical flame temperature ?
Q.18
For long flame and easy ignition, the coal used should have
Q.19
Hard pitch is used for making
Q.20
Traces of tar fog present in the coke oven gas is removed by
Q.21
__________ present in coal is not determined in its ultimate analysis.
Q.22
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having
Q.23
The calorific value is the highest out of the following for
Q.24
Which of the following is coking?
Q.25
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
Q.26
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
Q.27
Which is the most matured coal?
Q.28
Main use of soft coke is as __________ fuel.
Q.29
Fussain
Q.30
Which of the following gaseous fuels is likely to have the highest gross calorific value?
Q.31
Highly caking coals
Q.32
Fischer-Tropsch method aims at the
Q.33
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
Q.34
A coal having high amount of volatile matter
Q.35
Which of the following has the highest heat of combustion?
Q.36
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
Q.37
Overfire burning in a furnace is a phenomenon characterised by the
Q.38
Safe condition for storage of high V.M. bituminous coal is that
Q.39
A coal having high volatile matter content will
Q.40
Hard coke is manufactured from
Q.41
Assam coals suffers mainly from the disadvantage of high __________ content.
Q.42
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.
Q.43
Deficiency of combustion air during combustion of a gaseous fuel
Q.44
Which of the following is not a manufactured fuel ?
Q.45
Preheating of combustion air is done to
Q.46
Which of the following is a lean fuel gas?
Q.47
Which of the following is unsuitable fuel for producer gas manufacture?
Q.48
In general, the limit of inflammability/explosion limit of fuel gases is widened by the
Q.49
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.
Q.50
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain
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