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Chemical Engineering
Fuels And Combustion
Quiz 9
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Q.1
High ash coals
Are soft & friable (poor strength and size stability)
Require longer time of carbonisation as ash offers resistance to heat transfer
Produce larger quantity of coke oven gas
None of these
Q.2
Gray-King Assay and Roga Index of coal is a measure of its
Abradability
Grindability
Weathering properties
Caking and swelling properties
Q.3
Which of the following is a rich fuel gas?
Producer gas
Coal gas from underground gasification of coal
Refinery gases
None of these
Q.4
In low temperature carbonisation (as compared to high temperature carbonisation) of coal
Ammonia yield is more
Aliphatic tar is produced
Free carbon in tar is more
All of the above
Q.5
The main function of primary air in pulverised coal fired burner is to
Burn CO to CO₂
Dry and transport the coal
Have proper combustion by supplying it around the burner
Preheat the tertiary air used for complete combustion of CO to CO₂
Q.6
A coal with high __________ content, would ignite most easily.
Fixed carbon
Volatile matter
Ash
Oxygen
Q.7
Main constituents of purified Lurgi gas are
H₂, C
m
H
n
& CO₂
CO, H₂ & CH₄
CO₂, O₂ & CO
N₂, H₂ & CO₂
Q.8
Cannel coal and boghead coal are the examples of
Humic coals
Liptobiolites
Sapropelic coals
None of these
Q.9
Preheating of coal charge for the coke ovens reduces the
Time of carbonisation
Yield of gas and tar
Fuel consumption in coking
All of the above
Q.10
Fossil fuels mean
Solid fuels
Liquid fuels
Those fuels which are found in the crust of earth
Premature fuels with low calorific value
Q.11
Shatter index of the coke is a measure of its
Strength
Bulk density
Reactivity
None of these
Q.12
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.
1 to 2
3 to 4
5 to 15
20 to 40
Q.13
Turndown ratio of a gas burner is equal to the
Maximum to minimum heat input ratio
Maximum to minimum permissible gas flow rate
Both A & B
Minimum to maximum heat input ratio
Q.14
__________ process is meant for direct hydrogenation of coal to produce liquid fuel.
Fischer-Tropsch
Bergius
Lurgi
None of these
Q.15
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Ash disposal problem
Excessive fly-ash discharge from the stack
High power consumption in its transportation
Erosion of induced draft fan blades
Q.16
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
15 to 25
35 to 45
55 to 75
75
Q.17
Preheating of a gaseous fuel results in increased
Flame length
Flame temperature
Quantity of flue gas
Ignition temperature
Q.18
The shift conversion reaction taking place during water gas manufacture is given by
C + H₂O ⟷ CO + H₂
C + 2H₂O ⟷ CO₂ + 2H₂
CO + H₂O ⟷ CO₂ + H₂
None of these
Q.19
Froth floatation is used for
Washing fine coal dust (< 0.5 mm size)
Washing lump coal (> 80 mm size)
Removing ash from the coal based on difference in specific gravity of coal and ash
All of the above
Q.20
'Fat' coal means a coal having
Low calorific value
High volatile matter
Low ash content
Non smoking tendency
Q.21
Advantages of fluidised bed combustion are
Reduced NOx formation in flue gas
Lower furnace operating temperature
High heat transfer rate
All of the above
Q.22
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?
Producer gas
Carburetted water gas
Natural gas
Liquified petroleum gas
Q.23
In high temperature carbonisation (as compared to low temperature carbonisation) of coal
Coke oven gas yield is more
Tar yield is less but free carbon in tar is more
Calorific value of coke oven gas is less
All of the above
Q.24
A gaseous fuel in order to develop luminousity on burning, must contain
Carbon monoxide
Hydrocarbons
Hydrogen
Oxygen
Q.25
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
4
96
20
40
Q.26
Washing of coal
Reduces its sulphur and ash content
Controls its ash fusibility and increases its calorific value
Improves its coking properties
All of the above
Q.27
Presence of nitrogen in combustion air does not reduce the
Amount of heat liberated
Flame temperature
Flue gas temperature
Any of the above
Q.28
Air/gas ratio for complete combustion will be the highest for
LPG
Gobar gas
Coke oven gas
Carburetted water gas
Q.29
Washing of coal
Reduces its ash & sulphur content
Improves its coking properties
Increase the fusion point of its ash by removing chlorine compounds
All of the above
Q.30
Washing of coal decreases its
Caking index
Mineral matter content
Ash content
Both B and C
Q.31
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
Propane and acetylene
Propane and LPG
Sewage gas and gobar gas
B.F. gas and coke oven gas
Q.32
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?
Benzol
Pitch-cresosote mixture (PCM)
Napthalene
Ethylene
Q.33
Softening temperature of coal ash is a measure of the __________ of coal.
Caking tendency
Coking tendency
Clinkering tendency
Size stability
Q.34
Main constituent of the gas produced from a gobar gas plant is
CO₂
CH₄
H₂
CO
Q.35
Which is the heaviest fuel gas out of the following?
Blast furnace gas
Coke oven gas
Water gas
Carburetted water gas
Q.36
Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Gaseous
Solid
Liquid
Both B and C
Q.37
Which of the following coal gasification processes will produce gas having maximum methane content?
Winkler process
Lurgi process
Kopper-Totzek process
All of the above
Q.38
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
More
Less
Same
Data insufficient; can't be predicted
Q.39
Gross calorific value will be equal to the net calorific value for
H₂
C₂H₂
CO
C₂H₆
Q.40
Lurgi coal gasifier is a pressurised __________ bed reactor.
Moving
Fixed
Fluidised
Entrained
Q.41
Which of the following fuels is the best for burning on chain grate stoker?
Non-caking coal
Caking coal
Coking coal
Pulverised coal
Q.42
In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
CO
CO₂
O₂
H₂O
Q.43
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
Calorific value
Higher C/H ratio
Sulphur content
Difference in gross & net calorific value
Q.44
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of
Tar
Benzol
Ammonia
None of these
Q.45
Junker's calorimeter is used to determine the calorific value of
Pulverised coal
Gaseous fuels
Fuel oil
None of these
Q.46
A fuel with high heat release rate will
Require smaller combustion chamber
Have high calorific value
Have high adiabatic flame temperature
None of these
Q.47
Power alcohol as compared to straight run gasoline has lower
Calorific value
Octane number
Specific gravity
Viscosity
Q.48
Which of the following petrographic constituents of coal is non-coking?
Vitrain
Clarain
Durain
Fussain
Q.49
Caking index of coal blend used for blast furnace coke making is about
8
12
22
36
Q.50
Purity of coke means that, it is high in carbon and low in
Volatiles
Ash
Iron
Moisture
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