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Quiz 3
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Q.1
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
5
25
55
75
Q.2
Which of the following is used for making the explosive 'TNT'?
Benzol
Toluene
Pyridine
Cerosote
Q.3
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
2.5
7.5
10.5
14.5
Q.4
A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is
CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60
CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02
CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06
CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74
Q.5
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.
1800
3200
5400
10200
Q.6
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
1000
4000
6000
8000
Q.7
Bunsen burner is an example of a/an __________ burner.
Inside mixing/premix type
Outside mixing/diffusion flame/nozzle mix type
Rotary cup
Submerged combustion
Q.8
Stack (chimney) height in a big thermal power plant is dictated by the
Pollution control aspect
Draught to be created
Limitation of constructional facilities
None of these
Q.9
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.
1100
1250
1350
1400
Q.10
Coal tar fuel - 200 (CTF 200) is a mixture of
Pitch and creosote oil
Light oil and pitch
Anthracene and crecosote oil
Solar oil and pitch
Q.11
Which of the following is a single stage, fixed bed high pressure coal gasification process?
Winkler process
Kopper-Totzek process
Lurgi Process
None of these
Q.12
Width of the coke oven towards coke side is slightly more than that on pusher side to
Facilitate easy discharging of coke as it swells during carbonisation
Facilitate uniform heating of the oven
Increase the output of the coke
None of these
Q.13
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
Potassium hydroxide
Cuprous chloride
Alkaline pyragllol solution
None of these
Q.14
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
8800 kcal/m³
8800 kcal/kg
Same as that of coal middling
25000 kcal/kg
Q.15
__________ has the widest inflammability limit (explosion limit) of all the gases.
Hydrogen
Carbon monoxide
Acetylene
Methane
Q.16
Presence of force moisture in coal is most disadvantageous during its
Transportation and handling
Washing
Pulverisation
Storage
Q.17
A good coking coal should have high __________ content.
Ash
Sulphur & phosphorus
Moisture
None of these
Q.18
Main use of hard coke produced by high temperature carbonisation is in the
Iron blast furnace
Cupola in foundaries
Sinter making
Domestic ovens
Q.19
Undercharging of coal in the by-product coke ovens results in
Decrease in the c.v. of coke oven gas
Increase in its throughput
Increase in the c.v. of coke oven gas
No change in the c.v. of coke oven gas
Q.20
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
Multicyclones
Bag filter
Wet scrubber
Hydrocyclones
Q.21
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Entrained
Moving
Fixed
Fluidised
Q.22
Naphthalene recovered from coke oven gas is used
As moisture proof coating on fibres
As moth balls (insecticides)
As a fuel in furnaces
For making electrodes
Q.23
Pick out the wrong statement.:
Carburetted water gas is also called blue gas
Coals are divided in four species according to their carbon content in Seylor's classification
Carbonisation time in a by-product coke oven is about 16 hours
Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons
Q.24
Pick the odd man out.
Briquettes
Wood
Oil gas
Pitch creosote mixture
Q.25
Producer gas containing least amount of tar is produced by the
Partial combustion of coal
Partial combustion of large size (< 50 mm) coke
High pressure gasification of coal (e.g. in Lurgi gasifier)
Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
Q.26
Coke oven gas constitutes mainly of
H₂ & CO
H₂ & CH₄
CH₄ & CO
H₂ & CO₂
Q.27
Which of the following is a poisonous fuel gas?
Coke oven gas
Blast furnace gas
Natural gas
None of these
Q.28
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
500
750
950
1100
Q.29
During its calorific value determination by bomb calorimeter, coal is combusted by
Air
Oxygen
Oxygen enriched air
None of these
Q.30
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
Is less liable to spontaneous combustion on storage
Is more difficult to ignite and produces a shorter flame
Requires smaller combustion space and less secondary air
None of these
Q.31
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be
21
77
79
29
Q.32
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.
5
10
20
35
Q.33
Removal of hydrogen from coke oven gas
Increases its calorific value
Decreases its calorific value
Does not alter its calorific value
Is not possible on commerical scale
Q.34
The difference between total carbon and fixed carbon of coal will be minimum in case of
Lignite
Bituminous coal
Anthracite
High temperature coke (V.M < 0.5%)
Q.35
With increase in the oxygen content of the coal, its __________ decreases.
Calorific value
Caking power
Both A & B
Neither A nor B
Q.36
With increase in calorific value of fuels, their adiabatic flame temperatures
Increase
Decrease
Remain unchanged
May increase or decrease ; depends on the quantity of products of combustion
Q.37
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
Hot scarfing of steel slabs
Mixing with blast furnace gas
Coke oven battery heating
Steel ladle drying
Q.38
Coals used for the generation of producer gas should have
High caking index
Low fusion point of ash
High volatile matter content
Very low ash content (8-10%)
Q.39
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
Type (solid, liquid or gaseous)
Calorific value
Sulphur content
Ignition temperature
Q.40
Orsat apparatus
Gives flue gas analysis on dry basis
Determines N₂ in flue gas indirectly
Can
All of the above
Q.41
Orsat apparatus is meant for
Gravimetric analysis of flue gas
Finding out combustion efficiency
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
None of these
Q.42
Volumetric ratio of N₂ to O₂ in dry atmospheric air is
0.21
3.76
4.76
0.79
Q.43
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.
Sensible
Latent
Sensible and latent
None of these
Q.44
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Caking index
Yield of carbonised products
Friability & oxygen content
Calorific value
Q.45
A coal that softens and fuses on heating is
Classified
Carbonised
Caking
Non-caking
Q.46
Coke having higher porosity has
Lower bulk density
Lower strength
Higher reactivity
All of the above
Q.47
Critical Air Blast (CAB) value of coke is a direct measure of its
Reactivity
Hardness
Strength
None of these
Q.48
Gobar gas constitutes mainly of
CH₄ & CO₂
CO & CO₂
CH₄ & N₂
CO & N₂
Q.49
Producer gas comprises mainly of
CO & N₂
CO & H₂
CO₂ & N₂
CO₂ & H₂
Q.50
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.
Hydrogenation
Gasification
Carbonisation
None of these
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