4000
2500
6500
10000
✅ The correct answer is option C.
Fuel and Combustion MCQs
Weathering of coal during storage causes
Reduction in coal size
Increase in its friability
Decrease in its caking capacity
All of the above
✅ The correct answer is option D.
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the
Incomplete combustion
Complete combustion
High oxygen in flue gas
None of these
✅ The correct answer is option B.
Which of the following has the highest flame speed?
CO
H₂
CH₄
C₂H₆
✅ The correct answer is option B.
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its
Emissivity factor is higher
Sulphur content is lower
Flue gas has lower dew point thereby facilitating more waste heat recovery
All of the above
✅ The correct answer is option D.
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?
Blast furnace gas
Natural gas
Producer gas
Water gas
✅ The correct answer is option B.
Use of preheated air for combustion of fuel in the furnace, increases the
Scale losses of the furnace stock
Calorific value of the fuel
Flame temperature
None of these
✅ The correct answer is option C.
Low temperature oxidation of coal is accelerated by the
Storage in large heaps
Storage in compressed piles
Absence of porous or friable particles
All of the above
✅ The correct answer is option A.
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
1000
4000
6000
8000
✅ The correct answer is option B.
Micum Index of a coke is a measure of its
Reactivity
Porosity
Bulk density
Hardness & strength
✅ The correct answer is option D.