151. Air/gas ratio for complete combustion will be the highest for
LPG
Gobar gas
Coke oven gas
Carburetted water gas
✅ The correct answer is option A.
Fuel and Combustion MCQs
152. Narrow coke ovens as compared to wider coke ovens
Produce smaller coke
Produce stronger coke
Require less time of carbonisation
All of the above
✅ The correct answer is option D.
153. By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of
Tar
Benzol
Ammonia
None of these
✅ The correct answer is option C.
154. Actual flame temperature is always lower than the adiabatic flame temperature, because there is
No possibility of obtaining complete combustion at high temperature
Always loss of heat from the flame
Both A & B
Neither A nor B
✅ The correct answer is option C.
155. Which of the following is the maximum coal producing state in India?
Orissa
West Bengal
Jharkhand
Assam
✅ The correct answer is option C.
156. Soft coke is not
Produced by low temperature carbonisation of coal
A domestic fuel
Used in blast furnaces
None of these
✅ The correct answer is option C.
157. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
2CO ⟷ C + CO₂
CO + H₂O ⟷ CO₂ + H₂
C + H₂O ⟷ CO + H₂
C + 2H₂O ⟷ CO₂ + 2H₂
✅ The correct answer is option A.
158. Width of the coke oven towards coke side is slightly more than that on pusher side to
Facilitate easy discharging of coke as it swells during carbonisation
Facilitate uniform heating of the oven
Increase the output of the coke
None of these
✅ The correct answer is option A.
159. Pulverised coal used in boiler firing need not have
Less moisture content
High fusion point of its ash
High bulk density
Lower ash content
✅ The correct answer is option B.
160. Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.
300
2000
5000
10000
✅ The correct answer is option B.