201. Purity of coke means that, it is high in carbon and low in
Volatiles
Ash
Iron
Moisture
✅ The correct answer is option A.
Fuel and Combustion MCQs
202. Assam coals suffers mainly from the disadvantage of high __________ content.
Ash
Volatile matter
Sulphur (4-6%)
Moisture
✅ The correct answer is option C.
203. A coal having higher volatile matter content will necessarily have lower
Ash fusion temperature
Calorific value
Ignition temperature
Caking index
✅ The correct answer is option C.
204. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
< 37%
>71%
In between 37 & 71%
None of these
✅ The correct answer is option C.
205. Highly caking coals
Produce weak coke
Produce strong coke
May damage the coke oven walls during carbonisation
Both B and C
✅ The correct answer is option D.
206. High excess air in combustion of fuels results in
Increased fuel consumption
Incomplete combustion
Smoky flame
None of these
✅ The correct answer is option A.
207. Producer gas comprises mainly of
CO & N₂
CO & H₂
CO₂ & N₂
CO₂ & H₂
✅ The correct answer is option A.
210. In Orsat’s apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
CO
CO₂
O₂
H₂O
✅ The correct answer is option A.