Calorific value
Caking power
Both A & B
Neither A nor B
✅ The correct answer is option C.
Fuel and Combustion MCQs
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
400-500
900-1000
1400-1500
1700-1800
✅ The correct answer is option B.
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
KOH
Ammoniacal cuprous chloride
Pyrogallol solution
None of these
✅ The correct answer is option D.
Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
230 V AC
60 KV AC
230 V DC
60 KV DC
✅ The correct answer is option D.
Gross heating value of coal is __________ the net heating value.
Higher than
Lower than
Same as
None of these
✅ The correct answer is option A.
Preheating of combustion air is done to
Increase the adiabatic flame temperature
Increase the calorific value of the fuel
Complete the combustion of fuel
Reduce its requirement for effecting the complete combustion
✅ The correct answer is option A.
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
Low
High
Very high, if the fuel is of low calorific value
None of these
✅ The correct answer is option A.
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.
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.
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.