3373. 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
✅ The correct answer is option C.
3376. A coal with high __________ content, would ignite most easily.
Fixed carbon
Volatile matter
Ash
Oxygen
✅ The correct answer is option B.
3380. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
Back draughting
Banking
Under pressurising
None of these
✅ The correct answer is option B.
3383. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
It contains large amount of volatile matter
It is stored in tall heaps
Smaller fines are stored in large quantity
All of the above
✅ The correct answer is option D.
3391. Mott and Wheeler test is conducted on coke to find its
Reactivity with O₂
Abradability
Phosphorus content
Volatile matter content
✅ The correct answer is option A.
3395. The pyragallol solution used in orsat apparatus can absorb
Only O₂
Both O₂ and CO₂
Both O₂ and CO
All of the above
✅ The correct answer is option B.
3400. 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
✅ The correct answer is option B.
3407. Washing of coal is done to reduce the
Inherent impurities
Adhering impurities
Mineral matter
Both B and C
✅ The correct answer is option D.
3377. Blast furnace gas compared to coke oven gas has
Lower ignition temperature
Narrower limit of inflammability
Higher calorific value
Lower theoretical flame temperature
✅ The correct answer is option D.
3384. Combustion of pulverised coal as compared to that of lump coal
Develops a non-luminous flame
Develops a low temperature flame
Can be done with less excess air
Provides a lower rate of heat release
✅ The correct answer is option C.