Classified
Carbonised
Caking
Non-caking
✅ The correct answer is option C.
Fuel and Combustion MCQs
The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively
CO₂, O₂, CO
CO, O₂, CO₂
CO₂, CO, O₂
O₂, CO₂, CO
✅ The correct answer is option A.
Moisture loss is determined by the
Humidity of combustion air
Moisture content of fuel
Both A and B
The water formed by combustion reaction
✅ The correct answer is option C.
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.
60
160
500
750
✅ The correct answer is option B.
When incomplete combustion loss is high, the flue gas analysis shows large amount of
CO₂
CO
O₂
C
✅ The correct answer is option B.
Turndown ratio of a gas burner is equal to the
Maximum to minimum heat input ratio
Maximum to minimum permissible gas flow rate
Both A & B
Minimum to maximum heat input ratio
✅ The correct answer is option C.
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
0.5
10
50
500
✅ The correct answer is option B.
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
<120
>120
<90
90-110
✅ The correct answer is option B.
Gobar gas is produced by the __________ of cown dung.
Fermentation
Oxidation
Hydrogenation
None of these
✅ The correct answer is option A.
Combustion of pulverised coal compared to the lumpy coal
Provides better control of furnace temperature
Facilitates combustion with lower excess air
Provides higher thermal efficiency & flame temperature
All of the above
✅ The correct answer is option D.