50
1000
5000
10000
✅ The correct answer is option A.
Fuel and Combustion MCQs
A coal having higher volatile matter content, has lower
Smoking tendency on burning
Coke oven gas yield on carbonisation
Chance of catching fire during storage in open space
Ignition temperature
✅ The correct answer is option D.
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.
30
65
120
180
✅ The correct answer is option B.
Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Gaseous
Solid
Liquid
Both B and C
✅ The correct answer is option D.
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?
Low reactivity of carbonised residue containing high proportions of iron & sulphur
Low forced draught and fuel bed temperature
Thick fire bed and preheated primary air
All of the above
✅ The correct answer is option D.
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Because, it alone produces unreactive coke
Both A & B
Neither A nor B
✅ The correct answer is option C.
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
Less air for combustion
Correct amount of air for combustion
Too much air for combustion
Pulverised coal in boilers
✅ The correct answer is option C.
Which of the following is a poisonous fuel gas?
Coke oven gas
Blast furnace gas
Natural gas
None of these
✅ The correct answer is option B.
In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by
Potassium hydroxide
Cuprous chloride
Alkaline pyragllol solution
None of these
✅ The correct answer is option C.
Higher fuel combustion efficiency can not be achieved by
Preheating of fuel gases & combustion air
Reducing sulphur content in the fuel
Adopting proper fuel firing technique & fuel preparation
Supplying correct amount of combustion air
✅ The correct answer is option B.