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Chemical Engineering
Fuels And Combustion
Quiz 2
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Q.1
Pick out the wrong statement.
Cokes of high reactivity are obtained from weakly coking coals
Cokes of high reactivity are obtained from strongly coking coals
Reactivity of coke is inversely proportional to its absolute density
Abrasion index of the coke is a measure of its hardness
Q.2
The pyragallol solution used in orsat apparatus can absorb
Only O₂
Both O₂ and CO₂
Both O₂ and CO
All of the above
Q.3
Too much of excess air in combustion results in high
Fuel consumption for the same heat load
Stack gas temperature
Percentage of oxygen in flue gases
All of the above
Q.4
Catalyst used in Fischer-Tropsch process is
Nickel
Zinc oxide
Alumina
Thorium oxide
Q.5
Supply of excess air for complete combustion of fuel is necessitated to facilitate
Its thorough mixing with air
Attainment of chemical equilibrium
Attainment of high temperature
None of these
Q.6
In high temperature carbonisation of coal compared to low temperature carbonisation
Yield of ammonia is less
Aromatic content of tar is low
H₂ content in the coke oven gas is more
Calorific value of the coke oven gas is lower
Q.7
Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
3-5
25-30
60-65
95-100
Q.8
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the
Incomplete combustion
Complete combustion
High oxygen in flue gas
None of these
Q.9
Which of the following is a primary fuel?
Blast furnace coke
Gasoline
Natural gas
Wood charcoal
Q.10
Which of the following is not endothermic?
Cracking
Reforming
Gasification
Partial oxidation
Q.11
Calorific value of wood gas is about __________ kcal/Nm³.
1500
3300
5400
8500
Q.12
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.
4000
2500
6500
10000
Q.13
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³.
5000
25, 000
10, 000
15, 000
Q.14
Gray King Assay and Swelling Index of a coal is a measure of its
Swelling characteristics
Abradability
Agglutinating properties
Resistance to impact breakage
Q.15
Use of preheated air for combustion of fuel in the furnace, increases the
Scale losses of the furnace stock
Calorific value of the fuel
Flame temperature
None of these
Q.16
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.
Decreases
Increases
Remains constant
May increase or decrease, depends on combustibles
Q.17
The cuprous chloride used in orsat apparatus can absorb
Only CO
Both CO and CO₂
Both CO and O₂
All of the above
Q.18
Mott and Wheeler test is conducted on coke to find its
Reactivity with O₂
Abradability
Phosphorus content
Volatile matter content
Q.19
Main constituent of natural gas is
CH₄ (upto 90%)
C₂H₆
C₃H₈
H₂
Q.20
Volatile matter content of metallurgical coke may be around __________ percent.
1-2
10-15
22-26
30-33
Q.21
Quantity of coke produced from metallurgical coal may be around __________ percent.
30
50
75
95
Q.22
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?
Blast furnace gas
Natural gas
Producer gas
Water gas
Q.23
'Wobbe index' is a characteristic of
Solid fuels
Gaseous fuels
Liquid fuels
Fat coals
Q.24
In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by
Potassium hydroxide
Dilute potassium carbonate
Cuporus chloride
Alkaline pyragllol solution
Q.25
For maximum discharge through a chimney, its height should be
200 meters
Infinitely long
More than 105.7 metres
Equal to the height of the hot gas column producing draught
Q.26
Calorific value of dry wood may be around __________ Kcal/kg.
5
50
500
5000
Q.27
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
Back draughting
Banking
Under pressurising
None of these
Q.28
Abrasion index of blast furnace coke should be around __________ percent.
20
35
55
80
Q.29
Which of the following is not a binder for coal briquetting?
Coal tar
Bitumen
Molasses
None of these
Q.30
Fuel consumption in coke making can be reduced by
Preheating, blending and de-ashing the coal
Stamped charging of coal
Dry quenching of coke
All of the above
Q.31
Blast furnace gas compared to coke oven gas has
Lower ignition temperature
Narrower limit of inflammability
Higher calorific value
Lower theoretical flame temperature
Q.32
Combustion of pulverised coal as compared to that of lump coal
Develops a non-luminous flame
Develops a low temperature flame
Can be done with less excess air
Provides a lower rate of heat release
Q.33
Calorific value of bituminous coal may be around __________ Kcal/kg.
500
1500
6500
20000
Q.34
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
1000
4000
8000
15000
Q.35
Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.
6
12
18
24
Q.36
Increase in ash content of blast furnace coke
Reduces its consumption in the furnace
Increases its consumption in the furnace
Does not affect its consumption in the furnace
Decreases its hardness and abrasion resistance
Q.37
Pick out the wrong statement.
Main constituents of LPG are propane and butane
C.V. of natural gas is about 10000 KCal/Nm³
C.V. of LPG is about 26000 kcal/Nm³(11500 kcal/kg)
L.P.G. is lighter than air
Q.38
Natural draught produced by a chimney depends upon the
Density of the chimney gases
Height of the chimney
Both A & B
Neither A nor B
Q.39
During combustion of coal on grate, clinker formation is increased by the
Use of thick fire bed
Low fusion point of ash (< 1100° C)
Use of preheated primary air
All of the above
Q.40
A good quality coal should have
Low fusion point of ash
High ash content
High sulphur
None of these
Q.41
Calorific value of tar is about __________ Kcal/kg.
8800
12000
5000
16000
Q.42
Which of the following combustibles is absent in blast furnace gas?
H₂
CH₄
CO
None of these
Q.43
Which of the following would require maximum amount of % excess air for complete combustion?
Coke oven gas
Furnace oil
Pulverised coal
Lump coal (fixed on chain grate)
Q.44
Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
CO content
Dew point
CO₂ content
O₂ content
Q.45
High sulphur content in a fuel __________ of the flue gases.
Decreases the dew point
Increases the dew point
Reduces the combustion efficiency by limiting the permissible temperature reduction
Both B & C
Q.46
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
80-170
200-300
250-270
280-300
Q.47
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the
Gas yield is less
Tar yield is more
Ignition temperature of coke produced is less
Aromatic content of tar produced is more
Q.48
Pick out the wrong statement.
Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
None of these
Q.49
Coke oven gas is stripped of its H₂S and mercaptans content by
Absorption in wash oil
Adsorption on bog iron bed
Bubbling it through dilute sulphuric acid
Adsorption on silica gel
Q.50
Which of the following has the highest flame speed?
CO
H₂
CH₄
C₂H₆
0 h : 0 m : 1 s
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