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Chemical Engineering
Fuels And Combustion
Quiz 1
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Q.1
Coking coals are invariably
Semi-anthracites
Lignites
Bituminous coals
Anthracites
Q.2
Gobar gas is produced by the __________ of cown dung.
Fermentation
Oxidation
Hydrogenation
None of these
Q.3
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.
%of CO₂ in
% of O₂in
Temperature of
Colour of
Q.4
The catalyst used in shift converter is
Nickel
Vanadium
Silica gel
Alumina
Q.5
Which of the following has the highest gross calorific value?
Blast furnace gas
Coke oven gas
Carburetted water gas
Oil refinery gas
Q.6
Highly reactive coke have lower
Porosity
Coke reactivity index (CRI)
Critical air blast (CAB) value
Both B and C
Q.7
Which of the following accounts for maximum energy loss in a boiler?
Flue gases
Ash content in the fuel
Incomplete combustion
Unburnt carbon in flue gases
Q.8
Pulverised coal used in boiler firing need not have
Less moisture content
High fusion point of its ash
High bulk density
Lower ash content
Q.9
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as
M = 1.8 A
M = 0.5 A
M = 1.1 A
M = A
Q.10
The advantage of firing pulverised coal in the furnace lies in the fact, that it
Permits the use of high ash content coal
Permits the use of low fusion point ash coal
Accelerates the burning rate and economises on fuel combustion
All of the above
Q.11
Naphthalene is used for making
Insecticides (e.g. moth balls)
Unsaturated polyesters
Drug intermediates e.g. β-naphthol
All of the above
Q.12
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
Calorific value of the fuel
Flame temperature achieved
Speed of combustion of fuel
Heat transfer rate to the stock in the furnace
Q.13
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
550
750
950
1150
Q.14
Function of secondary air in pulverised coal firing is to
Transport the coal to the burner
Dry the coal
Ensure efficient burning of coal around the burner
Reduce primary air requirement
Q.15
'Mixed gas' used in steel plants is a mixture of
B.F. gas and coke oven gas
Coke oven gas and converter gas
Coke oven gas and L.P.G
Blast furnace gas and naphtha vapor
Q.16
High amount of sulphur and phosphorous in coke causes
Decrease in its calorific value
Increase in its strength
Brittleness of steel made by using it
None of these
Q.17
Which of the following constituents of coal is the most important in the production of coke?
Moisture
Ash
Volatiles
Carbon
Q.18
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its
Caking power
Calorific value
Hydrogen content
Oxygen content
Q.19
The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be
Y
0.95 y
1.05 y
1.8 y
Q.20
Blast furnace coke is made from coal by
Low temperature carbonisation
High temperature carbonisation
Medium temperature carbonisation
Heating the coal in an oven in presence of air
Q.21
Blast furnace gas constitutes mainly of
N₂ & CH₄
N₂ & H₂
N₂ & CO
CH₄ & CO₂
Q.22
Washing of coal does not reduce its
S & P content
Heating value
Fusion point of ash
None of these
Q.23
Benzol is used
As a motor fuel blend
For producing benzene, tolune & xylene by its distillation
Both A & B
Neither A nor B
Q.24
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.
6
18
28
36
Q.25
Nitrogen in coal
Is present upto 1-2%
Comes from protein in parent vegetable matter
Is recovered as ammonia during its carbonisation
All of the above
Q.26
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.
2
4
6
1
Q.27
Pick out the wrong statement.
Angle of repose of coal increases with its increasing size
Specific gravity of coal increases with its increasing maturity
Refractive index and reflectance of coal increases with the increasing rank of coal
Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal
Q.28
Bomb calorimeter can be used to determine the __________ of the coal.
Sulphur content
Calorific value
Both A & B
Neither A nor B
Q.29
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
Presence of large quantity of hydrogen in the fuel
Low calorific value of the fuel
High sulphur content in the fuel
Lack of thorough mixing of fuel with air
Q.30
Coking time in narrow by-product coke ovens is around __________ hours.
18
48
8
80
Q.31
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.
Bomb
Boy's
Junkar's
None of these
Q.32
Calorific value as determined by bomb calorimeter is the
Higher calorific value at constant volume
Gross calorific value at constant pressure
Lower calorific value at constant pressure
Net calorific value at constant volume
Q.33
Which of the following is the most poisonous gas?
Coke oven gas
Producer gas
Blast furnace gas
L.D. converter gas
Q.34
Efficient burning of anthracite coal requires
Low preheat of air
Fine grinding
High excess air
All of the above
Q.35
Caking index of a coal is a measure of its
Abradability
Reactivity
Agglutinating (binding) properties
Porosity
Q.36
Micum Index of a coke is a measure of its
Reactivity
Porosity
Bulk density
Hardness & strength
Q.37
Weathering of coal during storage causes
Reduction in coal size
Increase in its friability
Decrease in its caking capacity
All of the above
Q.38
Low temperature oxidation of coal is accelerated by the
Storage in large heaps
Storage in compressed piles
Absence of porous or friable particles
All of the above
Q.39
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.
2.4
1.75
0.87
11.4
Q.40
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
It contains large amount of volatile matter
It is stored in tall heaps
Smaller fines are stored in large quantity
All of the above
Q.41
If oxygen content in the flue gas rises too high, fuel is being wasted by
Incomplete combustion
Dry gas/stack gas loss
Moisture loss
None of these
Q.42
Coking time in beehive coke oven is about
12 hours
2-3 days
One week
Two weeks
Q.43
The calorific value of producer gas is around __________ kcal/Nm³
1300
500
4500
9000
Q.44
Yield of pitch from distillation of high temperature tar is around __________ percent.
10
25
65
90
Q.45
Rate of low temperature oxidation of coal due to bad storage conditions
Decreases with increase in surface area
Does not vary with increase in surface area
Is more for low volatile coal compared to high volatile coal
Is accelerated by storage in large heaps with small surface to volume ratio
Q.46
Washing of coal is done to reduce the
Inherent impurities
Adhering impurities
Mineral matter
Both B and C
Q.47
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its
Emissivity factor is higher
Sulphur content is lower
Flue gas has lower dew point thereby facilitating more waste heat recovery
All of the above
Q.48
The calorific value of natural gas is about __________ kcal/Nm³.
10, 000
2500
25, 000
35, 000
Q.49
Pick out the wrong statement.
Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal
Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery
A high swelling index number of coking coal indicates poor caking properties of coal
Wash oil is used for scrubbing benzol from coke oven gas
Q.50
With increase in moisture content of coal, its
Calorific value increases sometimes
Bulk density always decreases
Clinkering tendency during combustion increases
None of these
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