3161. Main constituent of the gas produced from a gobar gas plant is
CO₂
CH₄
H₂
CO
✅ The correct answer is option B.
Chemical Engineering
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3162. 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
✅ The correct answer is option A.
3163. 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
✅ The correct answer is option A.
3164. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
70
85
105
145
✅ The correct answer is option C.
3165. During coking of coal, the ash content (percentage)
Increases
Decreases
Remains constant
None of these
✅ The correct answer is option A.
3166. 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
✅ The correct answer is option C.
3167. The function of secondary combustion air is to
Pneumatically convey the pulverised coal
Completely burn the volatile matter
Burn the lumpy coal
None of these
✅ The correct answer is option B.
3168. 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
✅ The correct answer is option D.
3169. A coal that softens and fuses on heating is
Classified
Carbonised
Caking
Non-caking
✅ The correct answer is option C.
3170. The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively
CO₂, O₂, CO
CO, O₂, CO₂
CO₂, CO, O₂
O₂, CO₂, CO
✅ The correct answer is option A.