3152. Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
5
25
55
75
✅ The correct answer is option B.
3157. Orsat apparatus
Gives flue gas analysis on dry basis
Determines N₂ in flue gas indirectly
Can
All of the above
✅ The correct answer is option D.
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.
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.
3172. Moisture loss is determined by the
Humidity of combustion air
Moisture content of fuel
Both A and B
The water formed by combustion reaction
✅ The correct answer is option C.
3177. 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
✅ The correct answer is option C.
3143. Gobar gas is produced by the __________ of cown dung.
Fermentation
Oxidation
Hydrogenation
None of these
✅ The correct answer is option A.
3149. 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
✅ The correct answer is option C.
3153. Coke oven gas constitutes mainly of
H₂ & CO
H₂ & CH₄
CH₄ & CO
H₂ & CO₂
✅ The correct answer is option B.
3158. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
3 & 10
10 & 3
10 & 20
15 & 8
✅ The correct answer is option B.