Young
Mature
Both A & B
Neither A nor B
✅ The correct answer is option C.
Fuel and Combustion MCQs
Gobar gas constitutes mainly of
CH₄ & CO₂
CO & CO₂
CH₄ & N₂
CO & N₂
✅ The correct answer is option A.
Gray-King Assay and Roga Index of coal is a measure of its
Abradability
Grindability
Weathering properties
Caking and swelling properties
✅ The correct answer is option D.
In general, the limit of inflammability/explosion limit of fuel gases is widened by the
Increase in gas pressure
Increase in temperature (i.e. preheating)
Use of pure oxygen for combustion instead of air
All of the above
✅ The correct answer is option D.
As time passes, the calorific value of stored coal
Decreases
Increases
Remains unaltered
May increase or decrease (depends on the method of storage)
✅ The correct answer is option A.
Low temperature oxidation of coal during storage does not decrease its
Oxygen content
Caking power
Calorific value
None of these
✅ The correct answer is option D.
A gaseous fuel in order to develop luminousity on burning, must contain
Carbon monoxide
Hydrocarbons
Hydrogen
Oxygen
✅ The correct answer is option B.
The weathering index of a coal
Gives an idea of the fusion temperature of ash
Is related to its calorific value
Is a measure of its size stability, when stored & exposed to weather
Is a measure of its caking tendency
✅ The correct answer is option C.
Percentage of carbon monoxide in blast furnace gas may be around
8
14
22
52
✅ The correct answer is option C.
Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
200 °F
200 °C
200 °K
200 °R
✅ The correct answer is option A.