Increase
Decrease
Increase or decrease depending on the fuel type
Not change
✅ The correct answer is option B.
Fuel and Combustion MCQs
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
8800 kcal/m³
8800 kcal/kg
Same as that of coal middling
25000 kcal/kg
✅ The correct answer is option B.
Caking index of the coal blend used for the manufacture of metallurgical coke should be around
5
21
40
48
✅ The correct answer is option B.
Coalification means the
Process of conversion of lignite into anthracite
Underground gasification of coal
Complete combustion of coal
Direct hydrogenation of coal
✅ The correct answer is option A.
The heat of combustion of a fuel
Is equal to the heat of formation
Is always negative
Can’t be known without calculating it
Is always positive
✅ The correct answer is option B.
Coke compared to the coal from which it has been made, contains
Less volatile matter
More carbon
Greater percentage of ash
All of the above
✅ The correct answer is option D.
Purity of coke means that, it is high in carbon and low in
Volatiles
Ash
Iron
Moisture
✅ The correct answer is option A.
Assam coals suffers mainly from the disadvantage of high __________ content.
Ash
Volatile matter
Sulphur (4-6%)
Moisture
✅ The correct answer is option C.
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.
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.