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Chemical Engineering
Fuels And Combustion
Quiz 4
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Q.1
Largest constituent of coke oven gas is
N₂
H₂
CH₄
CO₂
Q.2
'Fat coals' are those coals which have very high
Caking capacity
Volatile matter content
Fusion point of its ash
Inherent moisture content
Q.3
Combustion of pulverised coal compared to the lumpy coal
Provides better control of furnace temperature
Facilitates combustion with lower excess air
Provides higher thermal efficiency & flame temperature
All of the above
Q.4
Use of pulverised coal in boiler furnace provides
High calorific value
Better combustion
Smokeless burning
Less erosion on furnace walls
Q.5
A travelling grate stoker is meant for the efficient burning of __________ coal.
Caking
Pulverised
Non-caking
High ash
Q.6
A coal having higher volatile matter content will necessarily have lower
Ash fusion temperature
Calorific value
Ignition temperature
Caking index
Q.7
Gross & net calorific value is the same for
Blast furnace gas
Coke oven gas
L.D. converter gas
None of these
Q.8
Which of the following constituents of a fuel does not contribute to its calorific value on combustion?
Hydrogen
Sulphur
Carbon
None of these
Q.9
Higher percentage of ash in coal meant for the production of metallurgical grade coke
Decreases the hardness of coke
Decreases the abrasion resistance of coke
Causes brittleness in steel
None of these
Q.10
Flue gas from the heating chamber of byproduct coke ovens is removed by
Forced draft fan
Induced draft fan
Steam ejector
Natural draft
Q.11
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that
21% excess air has been used for combustion
21% excess oxygen has been used for combustion
Complete combustion of fuel has taken place
No excess air has been used for combustion
Q.12
Which of the following is the maximum coal producing state in India?
Orissa
West Bengal
Jharkhand
Assam
Q.13
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
100 to 150
350 to 450
550 to 650
700 to 850
Q.14
A coal containing very high percentage of durain is called __________ coal.
Bright
Splint
Non-banded
Boghead
Q.15
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Transportation of coal
Drying of coal
Combustion of coal by supplying it around the burner
Preheating the primary air
Q.16
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.
15-30
1-2
70-100
150-200
Q.17
Ignition temperature of a fuel in air is __________ that in pure oxygen.
More than
Less than
Equal to
Either more or less; depends on the type of fuel
Q.18
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be
27.6
23
47.3
42.9
Q.19
The gasification reaction represented by, C + H₂O = CO + H₂, is
Exothermic
Endothermic
Catalytic
Autocatalytic
Q.20
The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
Fire point
Smoke point
Burning temperature
Kindling temperature
Q.21
Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?
Coal
Kerosene
Natural gas
Furnace oil
Q.22
Tar is a better fuel than furnace oil, because of its
Higher calorific value
Lower sulphur content
Higher emissivity (0.8 - 0.9) resulting in higher radiation heat transfer rate
Both A & B
Q.23
Grindability index of a coal is 100. It implies that the
Coal can be pulverised with great difficulty
Coal can't be pulverised
Coal can be easily pulverised
Power consumption in grinding the coal will be very high
Q.24
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
2.5
0.5
10
20
Q.25
The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction. n.
Neumann reversal
Shift conversion
Boudouard
Reduction
Q.26
Coke oven gas is a better fuel than blast furnace gas, because of its higher
Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
Adiabatic flame temperature
Heat release rate (thus requiring smaller combustion chamber)
All of the above
Q.27
The main advantage of forced draft over natural draft is that
Combustion of fuel is complete
Smaller height chimney can be used
Furnace control is easier
All of the above
Q.28
A particular coal is said to be free burning when it
Burns completely
Gives smokeless burning
Shows little or no fusing action
None of these
Q.29
High sulphur (4-6%) coal in India are found in
Assam
Andhra Pradesh
Bengal
Madhya Pradesh
Q.30
Which of the following is not used as a binder in coal briquetting?
Tar
Molasses
Pitch
Line
Q.31
Gross heating value of coal is __________ the net heating value.
Higher than
Lower than
Same as
None of these
Q.32
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.
60
160
500
750
Q.33
Artificial draught produced by a fan can be controlled by the
Speed of the fan
Damper
Variation in the pitch of the fan blades
All of the above
Q.34
A good metallurgical coke
Should have high porosity
Should be brittle
Must contain moderate quantities of ash, moisture, sulphur and volatile matters
Should have low fusion point of its ash
Q.35
Atomising steam to fuel oil ratio in a burner should be around
0.5
1.5
2.5
3.5
Q.36
__________ is used as jet engine fuel.
Petrol
Diesel
Kerosene
LPG
Q.37
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).
150
1500
3500
5000
Q.38
When incomplete combustion loss is high, the flue gas analysis shows large amount of
CO₂
CO
O₂
C
Q.39
Main constituents of benzol are
Benzene, toluene & xylene
Tar & creosote
Ammonia & phenol
Anthracene & phenol
Q.40
A coal with high ash content
Has higher calorific value
Is harder and stronger
Is not subjected to washing
Has low quantity of mineral matter
Q.41
Which of the following can be made into briquettes without the use of a binder?
Lignite
Bituminous coal
Anthracite coal
None of these
Q.42
Octane number of 2, 2, 4 - trimethyl pen-tane is
0
100
In between 0 and 100
More than 100
Q.43
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.
300
2000
5000
10000
Q.44
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
Colour
Moisture content
Ash content
Volatile matter
Q.45
Which will have the least volatile matter and hence will be the most difficult to ignite?
Bituminous coal
Coke
Semi-bituminous coal
Aanthracite
Q.46
Ratio of primary air to secondary air increases with increase in the rank of coal, because the
High rank coals have higher amount of volatile matter
Ratio of fixed carbon to volatile matter increases
Oxygen content progressively decreases
Calorific value of the coal increases
Q.47
Fuel for a nuclear reactor (thermal) is
Uranium
Plutonium
Radium
None of these
Q.48
Pick out the wrong statement.
High concentration of oxygen in flue gas means high stack loss
Gaseous fuels require the least % excess air for complete combustion
The ratio of fixed carbon to volatile matter percentage in coal is called its 'fuel ratio'
Calorific value of natural gas is more than that of LPG
Q.49
Coal containing large quantity of __________ are difficult to wash.
Ash
Inherent mineral matter
Free impurities
Volatile matter
Q.50
Gobar gas is produced by the __________ of 'gobar' (cow dung).
Hydrolysis
Fermentation
Oxidation
Dehydration
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