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Chemical Engineering
Fuels And Combustion
Quiz 8
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Q.1
Higher fuel combustion efficiency can not be achieved by
Preheating of fuel gases & combustion air
Reducing sulphur content in the fuel
Adopting proper fuel firing technique & fuel preparation
Supplying correct amount of combustion air
Q.2
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
Increase
Decrease
Increase or decrease depending on the fuel type
Not change
Q.3
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
Higher amount of methane
Lower amount of hydrogen
Both A & B
Higher amount of both methane and hydrogen
Q.4
Calorific value of coke oven gas is around __________ Kcal/Nm³.
900
4200
7500
2000
Q.5
Calorific value of of blast furnace gas is around __________ KCal/Nm³.
850
1800
4200
6500
Q.6
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?
Blast furnace coke
Low temperature coke
Anthracite coal
Sub-bituminous coal
Q.7
The combustion reaction, C + O₂ = CO₂, is
Exothermic
Endothermic
Autocatalytic
None of these
Q.8
In Lurgi coal gasifier,
Coking coals cannot be used
Low carbon conversion efficiency is achieved
Entrainment of solids is higher
Larger quantity of coal can be processed
Q.9
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
Density
Porosity
Electrical resistivity
None of these
Q.10
Pick out the correct statement.
Oxygen content decreases from lignite to bituminous coal as the coalification increases
The less the oxygen content, better is the coal, as it reduces the calorific value
With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases
All of the above
Q.11
Higher efficiency in the combustion of solid fuel can not be achieved by
Proper fuel preparation
Keeping the flue gas exhaust temperature very high
Adopting efficient-fuel firing technique & equipment
Supplying correct quantity of combustion air
Q.12
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
Pitch
Fuel oil
Blast furnace gas
Bituminous coal
Q.13
A good metallurgical coke should have very low
Sulphur & phosphorous content
Porosity
Fusion point of its ash
Hardness & strength
Q.14
Presence of free moisture in coal is most disadvantageous during
Its pulverisation (as it requires more power)
Combustion of fire slacks on the grates
Handling (e.g. when emptying wagons)
None of these
Q.15
High ash containing coke
Produces more slag when used in the blast furnace
Has poor strength and abrasion resistance
Is desirable in producer gas manufacture
None of these
Q.16
Presence of free moisture in coal during its high temperature carbonisation
Reduces the coking time
Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
Increases the loss of fine coal dust from the ovens when charging
None of these
Q.17
Which of the following has the highest theoretical flame temperature ?
Blast furnace gas
Hydrogen
Acetylene
Coke oven gas
Q.18
For long flame and easy ignition, the coal used should have
High volatile matter
Low ash
High calorific value
High ash
Q.19
Hard pitch is used for making
Pulverised fuel
Perfumes
Insecticides
Plastics
Q.20
Traces of tar fog present in the coke oven gas is removed by
Cyclone separator
Wet packed scrubber
Electrostatic precipitator
Washing with monoethanolamine
Q.21
__________ present in coal is not determined in its ultimate analysis.
Fixed carbon
Total carbon
Hydrogen
Nitrogen
Q.22
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having
Higher methane content and thus higher calorific value
Higher carbon monoxide content
Lower carbon dioxide content
None of these
Q.23
The calorific value is the highest out of the following for
Producer gas
Water gas
Coke oven gas
Blast furnace gas
Q.24
Which of the following is coking?
Vitrain
Fussain
Both A & B
Neither A nor B
Q.25
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
Air
Oxygen
Either A or B
Either A or C without gain or loss of heat
Q.26
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.
Hydrogen
Methane
Unsaturated hydrocarbons
All of the above
Q.27
Which is the most matured coal?
Lignite
Bituminous
Semi-anthracite
Anthracite
Q.28
Main use of soft coke is as __________ fuel.
Domestic
Blastfurnace
Foundary
None of these
Q.29
Fussain
Is friable, charcoal like substance
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
All of the above
Q.30
Which of the following gaseous fuels is likely to have the highest gross calorific value?
Sewage gas
LPG
Producer gas
Natural gas
Q.31
Highly caking coals
Produce weak coke
Produce strong coke
May damage the coke oven walls during carbonisation
Both B and C
Q.32
Fischer-Tropsch method aims at the
Gasification of coal
Synthesis of gasoline (from water gas)
Hydrogenation of coal to produce gasoline
None of these
Q.33
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
Carbon tetrachloride
Sand (40%)
Mineral oil of high viscosity & specific gravity (1.6)
None of these
Q.34
A coal having high amount of volatile matter
Would require smaller combustion chamber
Produces very little of tar and gas on carbonisation
Ignites easily and burns with long smoky flame
All of the above
Q.35
Which of the following has the highest heat of combustion?
H₂
CO
CH₄
C₂H₆
Q.36
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
2CO ⟷ C + CO₂
CO + H₂O ⟷ CO₂ + H₂
C + H₂O ⟷ CO + H₂
C + 2H₂O ⟷ CO₂ + 2H₂
Q.37
Overfire burning in a furnace is a phenomenon characterised by the
Supply of excess fuel
Supply of excess air
Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air
None of these
Q.38
Safe condition for storage of high V.M. bituminous coal is that
Height of the coal heap should be < 3 metres
Maximum 200 tons should be stored in a heap
Both A and B
Neither A nor B
Q.39
A coal having high volatile matter content will
Give less yield of tar and gas on carbonisation
Burn with a small non-smoky flame
Have a very high calorific value
None of these
Q.40
Hard coke is manufactured from
Lignite
Bituminous coal
Semi-anthracite
Anthracite
Q.41
Assam coals suffers mainly from the disadvantage of high __________ content.
Ash
Volatile matter
Sulphur (4-6%)
Moisture
Q.42
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.
Smoke
Temperature
Oxygen
Carbon monoxide
Q.43
Deficiency of combustion air during combustion of a gaseous fuel
Lengthens the flame
Causes heat loss of fuel by its partial combustion
Both A & B
Shortens the flame
Q.44
Which of the following is not a manufactured fuel ?
Furnace oil
Bagasse
Semi-coke
Kerosene
Q.45
Preheating of combustion air is done to
Increase the adiabatic flame temperature
Increase the calorific value of the fuel
Complete the combustion of fuel
Reduce its requirement for effecting the complete combustion
Q.46
Which of the following is a lean fuel gas?
Coke oven gas
LPG
Blast furnace gas
Natural gas
Q.47
Which of the following is unsuitable fuel for producer gas manufacture?
Coke
Anthracite
Coal having low fusion point of its ash
Coal having high fusion point of its ash
Q.48
In general, the limit of inflammability/explosion limit of fuel gases is widened by the
Increase in gas pressure
Increase in temperature (i.e. preheating)
Use of pure oxygen for combustion instead of air
All of the above
Q.49
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.
30
65
120
180
Q.50
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain
CO
CO₂
H₂O
Both B & C
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