Q.1
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
Q.2
Pick out the wrong statement.
Q.3
Fuel combustion is never cent per cent efficient due to
Q.4
Coal is pulverised before burning in large capacity boiler furnaces mainly to
Q.5
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.
Q.6
High excess air in combustion of fuels results in
Q.7
Combustion of pulverised fuel
Q.8
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.
Q.9
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
Q.10
Benzene is used
Q.11
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
Q.12
Spontaneous combustion of coal on storage results due to
Q.13
Coalification means the
Q.14
As time passes, the calorific value of stored coal
Q.15
'Fuel' can be defined as a substance which produces heat by
Q.16
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
Q.17
The internal energy of the combustion products is __________ compared to that of reactants.
Q.18
Fixed carbon in coal is defined as
Q.19
The most matured coal out of the following is
Q.20
Bright coal
Q.21
Bituminous coal
Q.22
Water gas constitutes mainly of
Q.23
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
Q.24
Cannel coal
Q.25
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by
Q.26
Low temperature carbonisation of coal produces
Q.27
Caking coal is desirable for
Q.28
When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.
Q.29
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
Q.30
The main product of high temperature carbonisation of coal is
Q.31
With increase in the temperature of carbonisation of coal
Q.32
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
Q.33
C/H ratio is the maximum in case of
Q.34
Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
Q.35
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively
Q.36
High temperature carbonisation of coal produces
Q.37
Coke made in narrower by-product coke ovens (as compared to wider ovens) is
Q.38
Ammonia content in raw coke oven gas is about __________ gm/Nm³.
Q.39
Anthracite can be used for
Q.40
Anthracite coal
Q.41
Which adsorbant is used for removing sulphur compounds (S Q, H₂S, RSH etc.) removal from coke oven gas in by-products recovery plant ?
Q.42
Number of macrocomponents present in coal according to Stopes are
Q.43
Calorific value of
Q.44
Beehive coke oven
Q.45
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
Q.46
A sooty flame can be made non-luminous by
Q.47
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
Q.48
Caking index of the coal blend used for the manufacture of metallurgical coke should be around
Q.49
Height of coke oven is limited (say maximum upto 7 metres) mainly by the
Q.50
Fusion point of coal ash increases with increase in its __________ content.
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