91. With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion
Increases
Decreases
Remains same
Either A or B, depends on other factors
✅ The correct answer is option A.
Fuel and Combustion MCQs
92. Which of the following coal gasification processes will produce gas having maximum methane content?
Winkler process
Lurgi process
Kopper-Totzek process
All of the above
✅ The correct answer is option B.
93. Calorific value of furnace oil is about __________ Kcal/kg.
10000
15000
5000
20000
✅ The correct answer is option A.
94. Fuel for a nuclear reactor (thermal) is
Uranium
Plutonium
Radium
None of these
✅ The correct answer is option A.
95. __________ of the coal is the basis for Seylor’s coal classification.
Proximate analysis
Ultimate analysis
Caking index
Calorific value
✅ The correct answer is option B.
96. Which of the following has the highest calorific value?
Lignite
Sub-bituminous coal
Anthracite
Peat
✅ The correct answer is option C.
97. Ratio of primary air to secondary air increases with increase in the rank of coal, because the
High rank coals have higher amount of volatile matter
Ratio of fixed carbon to volatile matter increases
Oxygen content progressively decreases
Calorific value of the coal increases
✅ The correct answer is option B.
98. Which of the following is unsuitable fuel for producer gas manufacture?
Coke
Anthracite
Coal having low fusion point of its ash
Coal having high fusion point of its ash
✅ The correct answer is option C.
99. Traces of tar fog present in the coke oven gas is removed by
Cyclone separator
Wet packed scrubber
Electrostatic precipitator
Washing with monoethanolamine
✅ The correct answer is option C.
100. Which of the following has the highest heat of combustion?
H₂
CO
CH₄
C₂H₆
✅ The correct answer is option D.