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Fuels And Combustion
Quiz 7
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Q.1
A coal with high ash content is undesirable, as
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber
The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the
The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes
All of the above
Q.2
Ignition temperature decreases progressively from anthracite to lignite, because
Volatile matter content increases
Carbon content decreases
Moisture content increases
Ash content increases
Q.3
Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.
H₂O
CO₂
CO
CH₄
Q.4
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?
Low reactivity of carbonised residue containing high proportions of iron & sulphur
Low forced draught and fuel bed temperature
Thick fire bed and preheated primary air
All of the above
Q.5
High temperature in gasification of coal favours
High production of CO₂
Low production of CO₂
High production of CO
Both B and C
Q.6
Which of the following oil gasification processes is non-catalytic?
Semet-Solvay process
Segas process
Onia-Gegi process
Steam reforming of naphtha
Q.7
Most of the coking coals are
Anthracite
Bituminous
Lignite
None of these
Q.8
Coke oven gas compared to blast furnace gas is
More explosive and inflammable
Less poisonous
Lighter
All of the above
Q.9
Coke oven gas burns with an yellowish flame, because of the presence of
CO₂
CH₄
H₂
NH₃
Q.10
Blast furnace gas burns with a bluish flame, because of the presence of
CO
CH₄
CO₂
S
Q.11
Which of the following fuels is generally not used in thermal power plant boiler firing?
Furnace oil, light diesel oil and tar/PCM
Pulverised coking coal
Coal middling from washeries
B.F. gas, coke oven gas and L.D. converter gas
Q.12
Bulk density of pulverised coal may be about __________ kg/m³.
100
500
1000
1500
Q.13
Fuel for a fast breeder nuclear reactor is
Plutonium
Uranium
Radium
Neptunium
Q.14
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is
Much lower
Much higher
Same
Either lower or higher, depends on the type of fuel
Q.15
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of
MgO & Na₂CO₃
MgSO₄ & BaCl₂
BaSO₄ & NaCl
MgCO₃ & NaCl
Q.16
Percentage of carbon monoxide in blast furnace gas may be around
8
14
22
52
Q.17
About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.
2
3
5
1
Q.18
High pressure coal gasification is employed in __________ process.
Lurgi
Kopper-Totzek
Winkler
None of these
Q.19
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.
Difference in gross & net calorific value of the coke oven gas
Free carbon content in tar
Yield percentage of coke
Yield of ammonia present in coke oven gas
Q.20
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion
Increases
Decreases
Remains same
Either A or B, depends on other factors
Q.21
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.
30
300
3000
30, 000
Q.22
Calorific value of furnace oil is about __________ Kcal/kg.
10000
15000
5000
20000
Q.23
With increase in C/H ratio of a fuel, the dew point of flue gases
Increases
Decreases
Remains same
May increase or decrease ; depends on the type of fuel
Q.24
Which of the following is not a 'manufactured' fuel?
LPG
Coal briquettes
Tar
Colloidal fuels
Q.25
Laboratory gas is obtained by the cracking of
Gasoline
Diesel
Fuel oil
Kerosene
Q.26
Coke oven gas consists mainly of
H₂, & CH₄
CO, & CO₂
H₂, & CO
CH₄, & CO
Q.27
Kopper-Totzek coal gasifier
Can give ammonia synthesis gas (H₂ + N₂)
Is a moving bed reactor
Cannot use coking coal
Operate at very high pressure
Q.28
__________ prohibits the use of alcohols directly in petrol engines.
Low octane number
High cost & availability
Low flash point
Low calorific value
Q.29
Gross and net calorific value of a fuel will be the same
If its ash content is zero
Ifits carbon content is very low
If its hydrogen/hydrogen compound content is zero
Under no circumstances
Q.30
Lignite is
A high rank coal
A coking coal
Can be used for gasification and steam generation
A black banded coal which burns with a non-smoky yellowish flame
Q.31
Which of the following is called "blue gas"?
Coke oven gas
Water gas
Natural gas
Producer gas
Q.32
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
Vitrain
Clarain
Durain
Fussain
Q.33
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
<120
>120
<90
90-110
Q.34
Coal tar (produced by high temperature carbonisation) is the main source of
Aromatic compounds
Alphatic compounds
Paraffins
Olefins
Q.35
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to
Minimise its corrosion
Avoid radiation heat loss
Make it look attractive
None of these
Q.36
(64-132) rank coal (ASTM) means a coal with 64%
Fixed carbon and having a heat value of 13, 200 BTU/1b
Ash and a heating value of 13, 200 BTU/1b
Fixed carbon and a heating value of 132 BTU/1b
None of these
Q.37
(64-132) rank coal (ASTM) means a coal with 64%
Fixed carbon and having a heating value around 13, 200 BTU/1b
Ash and heating value around 13, 200 BTU/1b
Fixed carbon and heating value around 132 BTU/1b
None of these
Q.38
The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .
1800
800
4500
10000
Q.39
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
Less air for combustion
Correct amount of air for combustion
Too much air for combustion
Pulverised coal in boilers
Q.40
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Because, it alone produces unreactive coke
Both A & B
Neither A nor B
Q.41
Which of the following is not a by-product fuel?
Pitch
Blast furnace gas
Petrol
Refinery gas
Q.42
Percentage of hydrogen in coke oven gas may be around
10
25
45
60
Q.43
Percentage of methane in coke oven gas may be around
5
15
25
50
Q.44
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of
Coke oven gas
Water gas
Natural gas
Blast furnace gas
Q.45
Desirable "Micum Index" values of metal-lurical coke are
M40 > 78% and M10 < 10%
M40 > 4% and M10 < 80%
M40 > 10% and M10 < 78%
M40 > 98% and M10 < 2%
Q.46
Low temperature carbonisation
Is mainly for producing the smokeless domestic coke
Is meant for the production of 'metallurgical coke'
Produces higher quantity of gas than high temperature carbonisation
Produces less quantity of tar than high temperature carbonisation
Q.47
Percentage of nitrogen in blast furnace gas may be around
5
25
55
80
Q.48
Largest constituent of blast furnace gas is
N₂
CO
CO₂
H₂
Q.49
Mineral matter content (M) and ash content (A) in coal are approximately related as
M = 1.1A
M = A
M = 1.5A
M = 2A
Q.50
Coke compared to the coal from which it has been made, contains
Less volatile matter
More carbon
Greater percentage of ash
All of the above
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