3381. Dry air required to burn 1 kg of carbon completely may be around __________ kg.
11
2
20
38
✅ The correct answer is option A.
Chemical Engineering
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3382. Percentage of hydrogen in coke oven gas may be around
10
25
45
60
✅ The correct answer is option D.
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.
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.
3385. Efficient burning of anthracite coal requires
Low preheat of air
Fine grinding
High excess air
All of the above
✅ The correct answer is option B.
3386. Anthracite coal
Contains more volatile matter than bituminous coal
Ignites more easily than bituminous coal
Is essentially a coking coal
Burns with short, bluish, yellow-tipped flame producing very little smoke
✅ The correct answer is option D.
3387. Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
H₂
CH₄
CO₂
N₂
✅ The correct answer is option B.
3388. Ignition temperature decreases progressively from anthracite to lignite, because
Volatile matter content increases
Carbon content decreases
Moisture content increases
Ash content increases
✅ The correct answer is option A.
3389. Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Fuel
Air
Both A & B
Neither A nor B
✅ The correct answer is option C.
3390. Initial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.
3-May
25-30
60-65
95-100
✅ The correct answer is option B.