351. Which of the following gaseous fuels is likely to have the highest gross calorific value?
Sewage gas
LPG
Producer gas
Natural gas
✅ The correct answer is option B.
Fuel and Combustion MCQs
352. Coal is pulverised before burning in large capacity boiler furnaces mainly to
Ensure its complete combustion
Facilitate easy ash removal
Enhance its calorific value
Provide trouble free operation
✅ The correct answer is option A.
353. Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
1kg mole
22.4 Nm³
32 kg
All of the above
✅ The correct answer is option D.
354. Calorific value of coke oven gas is around __________ Kcal/Nm³.
900
4200
7500
2000
✅ The correct answer is option B.
355. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.
Hydrogenation
Gasification
Carbonisation
None of these
✅ The correct answer is option A.
356. Combustion reaction of fuels is a/an __________ reaction.
Auto catalytic
Exothermic
Endothermic
None of these
✅ The correct answer is option B.
357. Which of the following is a rich fuel gas?
Producer gas
Coal gas from underground gasification of coal
Refinery gases
None of these
✅ The correct answer is option C.
358. Calorific value of of blast furnace gas is around __________ KCal/Nm³.
850
1800
4200
6500
✅ The correct answer is option A.
359. Gross calorific value will be equal to the net calorific value for
H₂
C₂H₂
CO
C₂H₆
✅ The correct answer is option C.
360. High temperature in gasification of coal favours
High production of CO₂
Low production of CO₂
High production of CO
Both B and C
✅ The correct answer is option D.