Q.1
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
Q.2
Which of the following is used for making the explosive 'TNT'?
Q.3
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
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
Q.5
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.
Q.6
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Q.7
Bunsen burner is an example of a/an __________ burner.
Q.8
Stack (chimney) height in a big thermal power plant is dictated by the
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.
Q.10
Coal tar fuel - 200 (CTF 200) is a mixture of
Q.11
Which of the following is a single stage, fixed bed high pressure coal gasification process?
Q.12
Width of the coke oven towards coke side is slightly more than that on pusher side to
Q.13
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
Q.14
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
Q.15
__________ has the widest inflammability limit (explosion limit) of all the gases.
Q.16
Presence of force moisture in coal is most disadvantageous during its
Q.17
A good coking coal should have high __________ content.
Q.18
Main use of hard coke produced by high temperature carbonisation is in the
Q.19
Undercharging of coal in the by-product coke ovens results in
Q.20
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
Q.21
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Q.22
Naphthalene recovered from coke oven gas is used
Q.23
Pick out the wrong statement.:
Q.24
Pick the odd man out.
Q.25
Producer gas containing least amount of tar is produced by the
Q.26
Coke oven gas constitutes mainly of
Q.27
Which of the following is a poisonous fuel gas?
Q.28
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
Q.29
During its calorific value determination by bomb calorimeter, coal is combusted by
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
Q.31
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be
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.
Q.33
Removal of hydrogen from coke oven gas
Q.34
The difference between total carbon and fixed carbon of coal will be minimum in case of
Q.35
With increase in the oxygen content of the coal, its __________ decreases.
Q.36
With increase in calorific value of fuels, their adiabatic flame temperatures
Q.37
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
Q.38
Coals used for the generation of producer gas should have
Q.39
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
Q.40
Orsat apparatus
Q.41
Orsat apparatus is meant for
Q.42
Volumetric ratio of N₂ to O₂ in dry atmospheric air is
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.
Q.44
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Q.45
A coal that softens and fuses on heating is
Q.46
Coke having higher porosity has
Q.47
Critical Air Blast (CAB) value of coke is a direct measure of its
Q.48
Gobar gas constitutes mainly of
Q.49
Producer gas comprises mainly of
Q.50
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.
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